[KScreen] [Bug 398345] Black screen

[MH2]

https://bugs.kde.org/show_bug.cgi?id=398345

--- Comment #3 from MH2  ---
This is a really old bug. I was very surprised to receive this request. I'm now
running Debian Bookworm, so I do have Plasma 5.26 installed and there are no
issues.







 On Wed, 09 Nov 2022 04:24:54 +0800 Nate Graham 
wrote ---



https://bugs.kde.org/show_bug.cgi?id=398345 

Nate Graham <mailto:n...@kde.org> changed: 

 What|Removed |Added 
 
 Resolution|--- |WAITINGFORINFO 
 Status|REPORTED|NEEDSINFO 
 CC||mailto:n...@kde.org 

--- Comment #2 from Nate Graham <mailto:n...@kde.org> --- 
Thank you for the bug report. Unfortunately we were not able to get to it yet. 
Can we ask you to please see if you can reproduce the issue with Plasma 5.25 or 
5.26? 

If you can, please change the status to CONFIRMED when replying. Thanks a lot!

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[kwin] [Bug 398345] New: Black screen

[MH2]

https://bugs.kde.org/show_bug.cgi?id=398345

Bug ID: 398345
   Summary: Black screen
   Product: kwin
   Version: 5.13.4
  Platform: Other
OS: Linux
Status: UNCONFIRMED
  Severity: normal
  Priority: NOR
 Component: general
  Assignee: kwin-bugs-n...@kde.org
  Reporter: haa...@zoho.com
  Target Milestone: ---

Presented with a black screen after system loads. Creating file
/etc/X11/xorg.conf with specified resolution using nvidia-xconfig results in
the SDDM login screen appearing correctly. However, after logging in I'm again
presented with a black screen. Plasma-desktop is active, since it will respond
to keyboard events. The problem has something to do with "handshaking" to
obtain correct screen resolution.

I'm now running Debian Stretch with an earlier version of KDE, but the problem
is the same when running Debian Buster. My PC is connected to an AVR via HDMI
that is limited to 1920x1080 resolution. The AVR is then connected via HDMI to
a 4k TV.

If I connect the system directly to the TV via HDMI, all is well, but I no
longer have surround sound. My NVidia card, GT 710 correctly detects the TV as
2-channel and  will not output multi-channel.

I did not have any display issues with earlier NVidia cards/drivers on this
system. Also, everything did work at one time running Buster, meaning the AVR
resolution was correctly detected and the nvidia-driver passed multi-channel
audio. However, subsequent updates to nvidia-driver, Xserver, and KDE libraries
resulted in the above behavior.

I reported this bug under KWIN because I can get everything to work with a
manual configuration of xorg.conf, i.e. working SDDM display with correct
resolution. KWIN seems to be re-acquiring the EDID from the TV and switching to
a 4k resolution which my AVR is incapable of handling.

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