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incripshin
n00b
Joined: 07 Oct 2005
Posts: 53
Location: Seattle, WA, US
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 Posted: Mon Jun 11, 2012 1:56 am Post subject: Dual-head display with fglrx + xrandr |
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I have been having a hard time getting xrandr to work with my ATI graphics card. Right now, my display mirrors to my TV, but I want my desktop to extend like it does in Windows. Ultimately, this is the error I get:
| Code: | $ xrandr --output DFP2 --left-of-DFP1
xrandr: screen cannot be larger than 1920x1920 (desired size 3840x1080) |
Some diagnostics follow. Notice that the maximum is 1920x1920 and that what I really want is 1776x1000 on my left display (otherwise the TV cuts off some pixels), so the Virtual line specifies a maximum of 3696x1080:
| Code: | $ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 1920 x 1920
DFP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.0*+
1776x1000 60.0 +
1280x720 60.0 +
1600x1200 60.0
1680x1050 60.0
1400x1050 60.0
1280x1024 75.0 60.0
1440x900 59.9
1280x960 75.0 60.0
1280x800 75.0 60.0
1152x864 75.0 60.0
1280x768 74.9 59.9
1024x768 75.0 70.1 60.0
800x600 72.2 75.0 70.0 60.3 56.2
720x480 60.0
640x480 75.0 72.8 60.0
DFP2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1018mm x 573mm
1920x1080 60.0*+ 30.0 24.0
1776x1000 60.0 + 30.0
1680x1050 60.0 +
1400x1050 60.0 +
1440x900 59.9 +
1280x1024 60.0
1280x960 60.0
1280x800 60.0
1152x864 60.0
1280x768 59.9
1280x720 60.0
1024x768 60.0
1152x648 60.0
800x600 60.3
720x480 59.9 30.0
640x480 60.0
CRT1 disconnected (normal left inverted right x axis y axis)
CRT2 disconnected (normal left inverted right x axis y axis)
TV disconnected (normal left inverted right x axis y axis)
CV disconnected (normal left inverted right x axis y axis) |
| Code: | $ cat /etc/X11/xorg.conf
Section "ServerLayout"
#Screen "Screen MGA 0" "" "" "" "Screen MGA 1"
#Screen "Screen MGA 1" "" "" "Screen MGA 0" ""
Identifier "layout0"
Screen "screen0"
#Screen "screen1" LeftOf "screen0"
EndSection
Section "Files"
FontPath "/usr/share/fonts/dejavu/"
FontPath "/usr/share/fonts/corefonts/"
FontPath "/usr/share/fonts/TTF/"
FontPath "/usr/share/fonts/OTF"
FontPath "/usr/share/fonts/misc/"
FontPath "/usr/share/fonts/Type1/"
FontPath "/usr/share/fonts/100dpi/"
FontPath "/usr/share/fonts/75dpi/"
EndSection
Section "Module"
Load "dbe"
SubSection "extmod"
Option "omit xfree86-dga"
EndSubSection
EndSection
Section "ServerFlags"
Option "AllowEmptyInput" "true" # input devices specified in /etc/X11/xorg.conf.d/
# in minutes:
Option "BlankTime" "10"
Option "StandbyTime" "20"
Option "SuspendTime" "30"
Option "OffTime" "60"
EndSection
Section "Monitor"
Identifier "Asus"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "Sony"
Option "DPMS" "true"
EndSection
Section "Device"
Identifier "radeon0"
Driver "fglrx"
Option "Monitor-DFP1" "Asus"
Option "Monitor-DFP2" "Sony"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "screen0"
Device "radeon0"
Monitor "Asus"
DefaultDepth 24
SubSection "Display"
Modes "1920x1080" "1680x1050" "1440x900" "1366x768"
Virtual 3696 1080
EndSubSection
EndSection |
I'm really out of ideas :( |
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BillWho
Veteran
Joined: 03 Mar 2012
Posts: 1600
Location: US
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| Posted: Mon Jun 11, 2012 2:18 am Post subject: |
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incripshin,
I think you have to add that mode 
Try
Then copy the section after Modeline to
| Code: | | xrandr --newmode "1776x1000_60.00" 147.25 1776 1888 2072 2368 1000 1003 1013 1038 -hsync +vsync |
then
| Code: | | xrandr --addmode DFP2 1776x1000_60.00 |
then
| Code: | | xrandr --output DFP2 --mode 1776x1000_60.00 |
Good luck 
_________________
Good luck
Since installing gentoo, my life has become one long emerge  |
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incripshin
n00b
Joined: 07 Oct 2005
Posts: 53
Location: Seattle, WA, US
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| Posted: Mon Jun 11, 2012 3:15 am Post subject: |
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[squint]Maybe[/squint], but both displays are capable of 1920x1080. What you say could be correct if xrandr/whatever tries enumerating the modes and finds nothing that adds up to my Virtual setting, and so ignores it. It seems more likely that if it were looking at my Modes, it would see that joining the first two yields 3600x1080 <= 3696x1080, which would be acceptable.
I can confirm that xrandr --output DFP2 --mode 1776x1000 does change the resolution of my second display, losing pixels on the right and bottom as compared to my primary display. I then attempted to do xrandr --output DFP2 --left-of DFP1 (I believe the extra hyphen was a typo in my first post) and got an equivalent error to what was posted.
I've since resorted to going to Windows so I can watch the fussballs and use my computer so I'll have to try that later. |
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incripshin
n00b
Joined: 07 Oct 2005
Posts: 53
Location: Seattle, WA, US
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| Posted: Wed Jun 13, 2012 5:28 am Post subject: |
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Okay, that just turns off my display and gives no error. I also tried using cvt -r 1776 1000 with no luck. I did try also using --left-of DFP1 to no effect.
edit
This seems to be an fglrx issue. I switched to the radeon driver and my maximum changed to what was specified in my Virtual line:
| Code: | $ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 3696 x 1080
DVI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.0*+ 60.0
1680x1050 59.9
1280x1024 75.0 60.0
1440x900 59.9
1280x960 60.0
1152x864 75.0
1024x768 75.0 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 59.9
720x400 70.1
DVI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1018mm x 573mm
1920x1080 60.0*+ 25.0
1920x1080i 30.0
2880x480 59.9
1280x1024 60.0
1280x720 60.0 25.0
1024x768 60.0
1440x480i 30.0
800x600 60.3
720x576 50.0
720x480 59.9
1440x240 60.1
640x480 59.9 |
I also lost and gained possible modes. Even if I figured out how to get KDE to work correctly with this setup, I wouldn't be happy with it.
edit deux
Okay I got my display to extend using just xorg.conf, but I'm losing all 3D acceleration. I would guess xrandr would give me 3d acceleration if it would just work... |
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