https://bugs.kde.org/show_bug.cgi?id=465001
TraceyC <kde...@tlcnet.info> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kde...@tlcnet.info
Ever confirmed|0 |1
Status|REPORTED |CONFIRMED
--- Comment #3 from TraceyC <kde...@tlcnet.info> ---
I see very similar behavior on my system, also multi monitor, with an nVidia
GPU
SUMMARY
After laptop display and external displays go to sleep, external monitors to
not get a valid display when waking them. Display Configuration displays the
correct configuration but loses the external monitors when you try to change
settings.
SETUP
Laptop connected via USB C to dock, 2 external displays
Displays had been set to
Laptop built-in - 3840x2400@150% 60Hz
External 1 DP - 3440x1440@100% 100Hz
External 2 HDMI - 3440x1440@100% 85Hz
GPU hybrid Intel / nVidia - proprietary drivers 550
STEPS TO REPRODUCE
Locked screen, went away for a while, all displays went to sleep.
Unlocked screen, only the laptop display lit up. Mouse was not confined to it,
Plasma still considered all 3 screens active.
I could only see the login screen on the laptop display, It did not show the
password prompt, indicating the focus was on one of the other screens. I was
able to log in by blindly entering my password.
The left display had backlight for a bit, then went black. Right display did
not change from blackt. There were no messages about "no signal" on either.
Went to Display Configuration
Set Right monitor to 50Hz, Apply - no change
Set Left monitor to 75Hz - system appeared to do display negotiation. Display
Configuration changed to only show the laptop display.
Unplugged the dock cable and reseated. Plasmashell crashed and restarted
Monitors were still black, they were again both shown in Display Config, both
enabled but neither had a display
In About this System, the GPU is shown as Mesa Intel UHD Graphics rather than
nVidia.
An attempt to restart plasmashell when the dock was connected, with systemctl
restart --user plasma-plasmashell.service caused it to segfault
After that, when I reseated the docking cable, the display was extended to all
3 displays as expected
ADDITIONAL INFORMATION
This bug doesn't happen with the monitors set to lower refresh rates e.g.
Laptop built-in - 3840x2400@150% 60Hz
External 1 DP - 3440x1440@100% 75Hz
External 2 HDMI - 3440x1440@100% 50Hz
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