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doubledr
n00b
Joined: 23 Feb 2008
Posts: 23
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 Posted: Fri Jul 22, 2022 3:19 pm Post subject: SDDM: Black Screen without any debug message |
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Well, this post is just for documentation.
I have a Gentoo VM machine with console only. And suddenly I want to try lxqt with sddm. So I installed everything prompted in emerge. But when I tried to start sddm, nothing happened. Not even a black screen... So I tried to update qt library. Nothing worked. I had no clue until I saw this post: sddm does not load gui . I followed what it said in that post and it worked. Finally I got a... black screen...
Here is the only message in my sddm.log
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[21:26:04.414] (II) DAEMON: Initializing...
[21:26:04.419] (II) DAEMON: Starting...
[21:26:04.419] (II) DAEMON: Logind interface found
[21:26:04.420] (II) DAEMON: Adding new display on vt 7 ...
[21:26:04.420] (II) DAEMON: Loading theme configuration from ""
[21:26:04.421] (II) DAEMON: Display server starting...
[21:26:04.421] (II) DAEMON: Adding cookie to "/var/run/sddm/{bc4449a4-7028-4937-937b-896d1768f797}"
[21:26:04.427] (II) DAEMON: Running: /usr/bin/X -nolisten tcp -auth /var/run/sddm/{bc4449a4-7028-4937-937b-896d1768f797} -background none -noreset -displayfd 17 -seat seat0 vt7
[21:26:04.844] (II) DAEMON: Setting default cursor
[21:26:04.845] (WW) DAEMON: Could not setup default cursor
[21:26:04.845] (II) DAEMON: Running display setup script "/usr/share/sddm/scripts/Xsetup"
[21:26:04.847] (II) DAEMON: Display server started.
[21:26:04.847] (II) DAEMON: Socket server starting...
[21:26:04.847] (II) DAEMON: Socket server started.
[21:26:04.847] (II) DAEMON: Loading theme configuration from ""
[21:26:04.847] (II) DAEMON: Greeter starting...
[21:26:04.855] (II) HELPER: [PAM] Starting...
[21:26:04.855] (II) HELPER: [PAM] Authenticating...
[21:26:04.855] (II) HELPER: [PAM] returning.
[21:26:04.861] (II) DAEMON: Greeter session started successfully
[21:26:04.939] (II) DAEMON: Message received from greeter: Connect
[21:26:04.989] (II) HELPER: [PAM] Closing session
[21:26:04.990] (II) HELPER: [PAM] Ended.
[21:26:04.992] (WW) DAEMON: Auth: sddm-helper exited with 6
[21:26:04.992] (II) DAEMON: Greeter stopped.
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That is it! No more debug output 
I googled and searched for a long long time and I couldn't find an answer. I guess this is a rare case.
Well, the turning point showed up when I read the LXQT wiki carefully, it told me that actually I could start LXQT without SDDM. And then I started lxqt without sddm. After lxqt showed up, I got the following error:
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Panel crashed too many times. Its autostart has been disabled until next login
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Then I tried to run lxqt-panel in console. Finally I got the real error:
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Cannot mix incompatible Qt library (5.15.3) with this library (5.15.5)
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OK, so the problem is that when I tried to resolve the show up issue, I upgraded my qt library, but portage didn't help me to fully upgrade my library, so my qt library was broken after I upgraded...
Then I updated my qt library entirely, everything back to normal now. SDDM and LXQT are borth working now. HAPPY! 
Well, I don't know whether I should file a bug for portage doesn't upgrade qt library entirely. But problem solved anyway.
Last edited by doubledr on Sat Jul 23, 2022 1:51 am; edited 3 times in total |
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Hu
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Joined: 06 Mar 2007
Posts: 21619
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| Posted: Fri Jul 22, 2022 4:09 pm Post subject: |
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| How did you do a partial Qt upgrade? We somewhat regularly get posts from people who try to do that, and Portage stops them. It insists they do all of Qt at a single step. |
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doubledr
n00b
Joined: 23 Feb 2008
Posts: 23
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| Posted: Sat Jul 23, 2022 1:21 am Post subject: |
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| Hu wrote: | | How did you do a partial Qt upgrade? We somewhat regularly get posts from people who try to do that, and Portage stops them. It insists they do all of Qt at a single step. |
Hi, Hu
I check my history, so actually I got some conflicts before I tried to emerge lxqt-meta, so I decided to unmerge them.
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emerge --unmerge qtcore qtgui qtwidgets qtdbus qtnetwork
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and I unmerged some other python-related packages
finally I used "emerge lxqt-meta" to install lxqt, and it seems that portage just installs all uninstalled qt libraries for me, without upgrading the rest of them.
So I didn't upgrade my qt library manually, it is portage which did the dependence analysis in command "emerge lxqt-meta" |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30905
Location: here
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| Posted: Sat Jul 23, 2022 5:58 am Post subject: |
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With emerge -uUD @world command, doesn't it update all qt libraries?
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doubledr
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Joined: 23 Feb 2008
Posts: 23
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| Posted: Sat Jul 23, 2022 8:35 am Post subject: |
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| fedeliallalinea wrote: | | With emerge -uUD @world command, doesn't it update all qt libraries? |
Hi, fedeliallalinea. The only command I ran is "emerge lxqt-meta". I didn't run " emerge -uUD @world" |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30905
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| Posted: Sat Jul 23, 2022 3:42 pm Post subject: |
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When a new qt version come first you should update the @world because all qt packages installed should be upgraded.
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wjb
l33t
Joined: 10 Jul 2005
Posts: 607
Location: Fife, Scotland
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| Posted: Sun Jul 24, 2022 10:38 am Post subject: |
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| For keeping your system up to date, see wiki: Upgrading Gentoo |
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