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[Solved] KDE & Qt applications do not print.
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Perfect Gentleman
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PostPosted: Thu Mar 29, 2018 5:30 am    Post subject: [Solved] KDE & Qt applications do not print. Reply with quote
Qpdfview shows warning
Quote:
Could not print ${name}.pdf
.
Code:
lp ${name}.pdf
works.
Zathura with Poppler backend prints too as well as Chromium.
wtf?

Last edited by Perfect Gentleman on Thu Apr 05, 2018 4:00 pm; edited 3 times in total
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Perfect Gentleman
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PostPosted: Thu Apr 05, 2018 9:47 am    Post subject: Reply with quote
Code:
$ okular --print HEAD_TYROLIA_Template__92.pdf
/usr/bin/lpr: No such file or directory

Code:
$ equery b /usr/bin/lpr
 * Searching for /usr/bin/lpr ...
net-print/cups-2.2.7 (/usr/bin/lpr)

Code:
$ whereis lpr                                                                               
lpr: /usr/bin/lpr /usr/share/man/man1/lpr.1.bz2

Code:
 $ lpstat -t
scheduler is running
system default destination: Samsung_M2070_Series
device for Samsung_M2070_Series: ipp://192.168.100.12:631/printers/Samsung_M2070_Series
Samsung_M2070_Series accepting requests since Thu 05 Apr 2018 04:43:46 PM +07
printer Samsung_M2070_Series is idle.  enabled since Thu 05 Apr 2018 04:43:46 PM +07


WTF?
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Perfect Gentleman
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PostPosted: Thu Apr 05, 2018 9:53 am    Post subject: Reply with quote
try to print from gwenview
Code:
 $ gwenview
QPainter::begin(): Returned false
QPainter::viewport: Painter not active
alignment= 132
QPainter::setViewport: Painter not active
QPainter::setWindow: Painter not active


from kolourpaint
Code:
$ kolourpaint
kf5.kio.core: KSambaShare: Could not find smb.conf!                                                                                                         
QPainter::begin(): Returned false                                                                                                                           
QPainter::end: Painter not active, aborted
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asturm
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PostPosted: Thu Apr 05, 2018 12:12 pm    Post subject: Reply with quote
USE=cups is enabled system-wide?
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Perfect Gentleman
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PostPosted: Thu Apr 05, 2018 1:36 pm    Post subject: Reply with quote
of course
Code:
~ $ eix --installed-without-use cups
No matches found

as I said above printing from other applications works.
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mike155
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PostPosted: Thu Apr 05, 2018 2:01 pm    Post subject: Reply with quote
Quote:
$ okular --print HEAD_TYROLIA_Template__92.pdf
/usr/bin/lpr: No such file or directory

Please run
Code:
strace -o /tmp/log -f okular --print HEAD_TYROLIA_Template__92.pdf
grep lpr /tmp/log

and post the output of the grep statement (approx. 30 lines)
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Perfect Gentleman
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PostPosted: Thu Apr 05, 2018 2:18 pm    Post subject: Reply with quote
Code:
$ grep lpr /tmp/log
22052 statx(AT_FDCWD, "/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/lib/llvm/6/bin/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/local/bin/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/bin/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/bin/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/opt/bin/lpr-cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/lib/llvm/6/bin/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/local/bin/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/bin/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/bin/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/opt/bin/lpr.cups", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/lib/llvm/6/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/local/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239cbf0) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=14448, ...}) = 0
22052 access("/usr/bin/lpr", X_OK)      = 0
22052 statx(AT_FDCWD, "/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239ca50) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/lib/llvm/6/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239ca50) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/local/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7fff2239ca50) = -1 ENOENT (No such file or directory)
22052 statx(AT_FDCWD, "/usr/bin/lpr", AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=14448, ...}) = 0
22052 access("/usr/bin/lpr", X_OK)      = 0
22068 execve("/usr/bin/lpr", ["/usr/bin/lpr", "-P", "", "-#1", "-J", "Pro/ENGINEER - PAPIERBOHRLEHRE", "-r", "/tmp/okular_BMvshN.ps"], 0x7fff2239d858 /* 62 vars */ <unfinished ...>
22068 write(2, "/usr/bin/lpr: No such file or di"..., 40) = 40
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mike155
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PostPosted: Thu Apr 05, 2018 2:49 pm    Post subject: Reply with quote
Thanks for the output. That looks pretty good - with the exception of the last two lines.

Look at the second last line. Okular uses '/usr/bin/lpr' to print a file - and that's perfectly fine. But the second argument is empty - and that's the problem. The argument should contain the printer name - but it doesn't. As a result, /usr/bin/lpr fails. The error message given by okular is wrong, of course. It should be 'lpr: The printer or class does not exist' - and not: '/usr/bin/lpr: No such file or directory'. That's probably a bug in Okular, but it's not the cause of your problem.

Let's try to find out why Okular uses an empty printer name when it calls lpr.
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Perfect Gentleman
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PostPosted: Thu Apr 05, 2018 2:55 pm    Post subject: Reply with quote
imo, it's problem with Qt as Qt applications as well KDE applications can not print.
Code:
$ strace -o /tmp/log_gwen -f  gwenview 0000
QPainter::begin(): Returned false
QPainter::viewport: Painter not active
alignment= 132
QPainter::setViewport: Painter not active
QPainter::setWindow: Painter not active


grep print /tmp/log_gwen
Code:
~ $ grep lp /tmp/log_gwen
28790 read(11, "[Protocol]\nhelper=true\nexec=\npro"..., 16384) = 3056
28790 read(18, "DRIVER=lpc_ich\nPCI_CLASS=60100\nP"..., 4096) = 162
28790 read(18, "DRIVER=lpc_ich\nPCI_CLASS=60100\nP"..., 4096) = 162
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 read(22, "[Dolphin]\nTimestamp=2018,1,7,22,"..., 16384) = 59
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)


Code:
~ $ grep cups /tmp/log_gwen
28790 lstat("/usr/lib64/qt5/plugins/printsupport/libcupsprintersupport.so", {st_mode=S_IFREG|0755, st_size=72744, ...}) = 0
28790 openat(AT_FDCWD, "/usr/lib64/qt5/plugins/printsupport/libcupsprintersupport.so", O_RDONLY|O_CLOEXEC) = 18
28790 openat(AT_FDCWD, "/usr/lib64/qt5/plugins/printsupport/libcupsprintersupport.so", O_RDONLY|O_CLOEXEC) = 18
28790 openat(AT_FDCWD, "/usr/lib64/libcups.so.2", O_RDONLY|O_CLOEXEC) = 18
28790 openat(AT_FDCWD, "/etc/cups/client.conf", O_RDONLY) = 18
28790 read(18, "ServerName /run/cups/cups.sock\n", 4096) = 31
28790 openat(AT_FDCWD, "/home/user_user/.cups/client.conf", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 connect(18, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f2600) = -1 ENOENT (No such file or directory)
28790 connect(20, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 access("/usr/share/locale/en_US/cups_en_US.po", F_OK) = -1 ENOENT (No such file or directory)
28790 access("/usr/share/locale/en/cups_en.po", F_OK) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/usr/share/locale/C/cups_C.po", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f2620) = -1 ENOENT (No such file or directory)
28790 connect(20, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f2660) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f18a0) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f1910) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f1870) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 recvfrom(18, "lication/vnd.cups-paged-brf", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-paged-ubrl", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-pdf", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-pdf-banner", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-postscript", 31, 0, NULL, NULL) = 31
28790 recvfrom(18, "application/vnd.cups-ppd", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-raster", 27, 0, NULL, NULL) = 27
28790 recvfrom(18, "application/vnd.cups-raw", 24, 0, NULL, NULL) = 24
28790 recvfrom(18, "application/vnd.cups-ubrl", 25, 0, NULL, NULL) = 25
28790 recvfrom(18, "image/vnd.cups-brf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-pdf", 18, 0, NULL, NULL) = 18
28790 recvfrom(18, "image/vnd.cups-ubrl", 19, 0, NULL, NULL) = 19
28790 recvfrom(18, "cups-version", 12, 0, NULL, NULL) = 12
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f1890) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
28790 openat(AT_FDCWD, "/etc/cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 openat(AT_FDCWD, "/home/user_user/.cups/lpoptions", O_RDONLY) = -1 ENOENT (No such file or directory)
28790 stat("/etc/cups/ppd/Samsung_M2070_Series.ppd", 0x7ffee57f18e0) = -1 ENOENT (No such file or directory)
28790 connect(22, {sa_family=AF_UNIX, sun_path="/run/cups/cups.sock"}, 22) = 0
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mike155
Advocate
Advocate


Joined: 17 Sep 2010
Posts: 4438
Location: Frankfurt, Germany
PostPosted: Thu Apr 05, 2018 3:29 pm    Post subject: Reply with quote
Well, here is what happens:
  1. You start okular
  2. Okular reads a few local CUPS configuration files
  3. Okular connects to the CUPS server via TCP/IP and reads a list of available printers and their configuration
  4. Okular calls lpr to print a file and specifies an empty printer name

Your printing problem could be caused by:
  1. You have an invalid CUPS server configuration
  2. You have a valid, but highly unusable CUPS server configuration
  3. You have an error in your CUPS client configuration
  4. You have a valid, but highly unusable CUPS client configuration
  5. There's a bug in your CUPS software
  6. There's a bug in your Qt or KDE software

Most people don't have problems if they use KDE, Qt and CUPS to print their files. There must be a very specific problem with your local setup.
  1. Which versions of CUPS, Qt and KDE do you use? Do you use any non-standard flags or options to install these packages?
  2. Please look at the output of 'grep open /tmp/log'. It will show you some client CUPS configuration files (/etc/cups/client.conf, ~/.cups/lpoptions, etc). Please double-check their contents.
  3. Please look at the configuration files on your CUPS server. Is there anything that could confuse Qt/KDE?
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Perfect Gentleman
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Joined: 18 May 2014
Posts: 1249
PostPosted: Thu Apr 05, 2018 3:34 pm    Post subject: Reply with quote
1 - printing of test page from SystemSetting - ok
2 - printing from Libreoffice, Chromium, Zathura - ok
3 - another with the sane verions of KDE and Qt - ok
4 - printing from any Qt5/KDE app - not ok
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Perfect Gentleman
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Joined: 18 May 2014
Posts: 1249
PostPosted: Thu Apr 05, 2018 3:54 pm    Post subject: Reply with quote
solved
add
Code:
$ cat /etc/cups/client.conf
ServerName 192.168.100.102:631
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dantefff
n00b
n00b


Joined: 14 Oct 2019
Posts: 1
PostPosted: Mon Oct 14, 2019 10:10 am    Post subject: Reply with quote
Perfect Gentleman wrote:
solved
add
Code:
$ cat /etc/cups/client.conf
ServerName 192.168.100.102:631


Sorry for bothering with a thread of a year ago, but I have a similar problem in Debian, I have been searching Internet and this thread is referenced in some places so I think this is the right place to continue.

Just to throw a little more of light and info.

In my case, I was configuring a remote printer in my local cups server. Until buster, I have done this as
Code:
lpadmin -p HL5470DW -E -v ipp://SERVER_IP/printers/HL5470DW
This creates a local printer in my local cups pointing to the remote printer in the remote cups. This does not work in qt apps (in Buster).

The workaround for me was to put in the /etc/cups/client.conf the remote cups addres
Code:
ServerName SERVER_IP:631
in order to make the qt apps work straight to the remote cups server.
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