https://bugs.kde.org/show_bug.cgi?id=495746
Bug ID: 495746
Summary: After a short
DDCA_EVENT_DPMS_ASLEEP/DDCA_EVENT_DPMS_AWAKE cycle
Plasma is unusable
Classification: Plasma
Product: Powerdevil
Version: 6.2.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: lukasz.wojnilow...@gmail.com
CC: natalie_clar...@yahoo.de
Target Milestone: ---
Created attachment 175483
--> https://bugs.kde.org/attachment.cgi?id=175483&action=edit
journalctl since idle time
SUMMARY
My external screen goes to sleep correctly, but soon, after it displays "stand
by" message by itself, it wakes up. Plasma becomes unusable (for example my
taks manager disappears) afterwards.
There is no core dump after checking with coredumpctl, so I believe it doesn't
crash. I need to "systemctl --user status plasma-plasmashell" to make it usable
again.
STEPS TO REPRODUCE
1. Set turn off screen time to 1 minute in System Settings
2. Wait 1 minute for the screen to fade to black
3. See "stand by" message on my screen
4. See that my screen turned on again by itself after 10 seconds of being
turned off
OBSERVED RESULT
My external screen goes to sleep but awakes shortly afterwards.
EXPECTED RESULT
My external screen should go to sleep and stay like that when uninterrupted.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
Kernel Version: 6.11.5-300.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Graphics Processor: NV96
ADDITIONAL INFORMATION
1. I noticed this strange message in journalctl
lis 03 12:26:46 myuser.myhost org_kde_powerdevil[1607]: busno=2,
sleep-multiplier = 1,60. Testing for supported feature 0x10 returned
Error_Info[DDCRC_DPMS_ASLEEP in ddc_write_read_with_retry, causes: ENXIO]
2. Not happening on nvidia-340xx when on Plasma 5
3. Dimming of the screen works correctly
4. It's a laptop with an external screen connected through HDMI. Laptop's
built-in screen is disabled in System Settings.
5. In dmesg I have "[ 8.315960] nouveau 0000:01:00.0: DRM: Skipping
nv_backlight registration"
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