Bug 500966 - Display Resolution on secondary display resets to 640x480 - intermittent
Summary: Display Resolution on secondary display resets to 640x480 - intermittent
Status: RESOLVED DOWNSTREAM
Alias: None
Product: KScreen
Classification: Plasma
Component: common (other bugs)
Version First Reported In: 6.3.2
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: kscreen-bugs-null@kde.org
URL:
Keywords: multiscreen, X11-only
Depends on:
Blocks:
 
Reported: 2025-03-02 17:24 UTC by Cordt
Modified: 2025-03-14 03:21 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:


Attachments
hwinfo --display --monitor (3.75 KB, text/plain)
2025-03-02 17:24 UTC, Cordt
Details

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Description Cordt 2025-03-02 17:24:38 UTC
Created attachment 179045 [details]
hwinfo --display --monitor

SUMMARY
I have 2 displays, the secondary which is rotated 90 degrees will often return from "sleep" or some other power state at the minimum possible resolution, and sometimes simply will not wake at all. I can manually change the resolution back, or reboot the PC to fix it.
It does not happen every time.
I have not tried simply restarting sddm (hasn't crossed my mind until just now)

This only began several days ago with an update. I am fairly religious with updating, so it was almost certainly an update released within the past 2-3 days.

Second possibly related issue:
When the displays dim automatically, sometimes the primary display will not return to normal brightness until I either drag the brightness slider (which is still at the normal setting) at which point normal brightness will resume in about half a second, or use the hardware button on the display itself which (consistently) will have been reduced to 10.
Secondary display does not exhibit this behavior.
I have not created a second issue as of yet.

STEPS TO REPRODUCE
1. Let display(s) sleep
*or*
2. Let PC sleep
*or*
3. Let display(s) dim

OBSERVED RESULT
Displays will not always return to the previous settings as configured in the display section of the settings UI.

EXPECTED RESULT
Displays should return to the previous settings.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: y
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION

Kernel: 6.13.5-zen1-1-zen (64)
Graphics Platform: X11
Graphics Card: Radeon Vega 64

Detailed hardware specs attached.
Comment 1 vcharette 2025-03-05 13:33:52 UTC
I have the same issue except it's on my main (and only) monitor.

Operating System: Arch Linux 
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.5-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 31.1 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4070 Ti SUPER
Manufacturer: ASUS
Comment 2 Nate Graham 2025-03-05 17:35:43 UTC
This on;y happens on X11, right? Not also on Wayland?
Comment 3 vcharette 2025-03-05 18:34:47 UTC
(In reply to Nate Graham from comment #2)
> This on;y happens on X11, right? Not also on Wayland?

I'm experiencing the 640x480 bug on x11. Haven't tried Wayland.
Comment 4 Nate Graham 2025-03-05 21:21:24 UTC
Can you try it on Wayland and see?
Comment 5 Cordt 2025-03-06 05:10:53 UTC
Yeah I'll try to remember to test this tomorrow. There's something with Wayland that breaks something I use constantly though so I prefer not to use it.
Comment 6 Nate Graham 2025-03-06 21:09:29 UTC
(In reply to Cordt from comment #5)
> There's something with Wayland that breaks something I use constantly
Can you be more specific?
Comment 7 Cordt 2025-03-06 23:09:29 UTC
(In reply to Nate Graham from comment #6)
> (In reply to Cordt from comment #5)
> > There's something with Wayland that breaks something I use constantly
> Can you be more specific?

Sorry I didn't see the reply button... And no actually I can't remember exactly what it was, I think it was related to either my screen snipping tool or screen recorder not working properly, and the overall "feel" being not quite as nice as x11.
Unrelated to the issue here anyway. This only began a few days ago.
Comment 8 Cordt 2025-03-12 04:35:57 UTC
(In reply to Cordt from comment #7)
> (In reply to Nate Graham from comment #6)
> > (In reply to Cordt from comment #5)
> > > There's something with Wayland that breaks something I use constantly
> > Can you be more specific?
> 
> Sorry I didn't see the reply button... And no actually I can't remember
> exactly what it was, I think it was related to either my screen snipping
> tool or screen recorder not working properly, and the overall "feel" being
> not quite as nice as x11.
> Unrelated to the issue here anyway. This only began a few days ago.

The issue resolved itself with a further update earlier today.

And the issue with Wayland and reason I don't use it is because my screen recorder does not work -- it only records a black image with a moving cursor and nothing else.
Comment 9 Nate Graham 2025-03-12 17:05:38 UTC
Yeah, screen recording tools need to be updated for Wayland. FWIW, KDE's Spectacle app does screen recording now; it's built in!
Comment 10 Cordt 2025-03-14 03:21:58 UTC
(In reply to Nate Graham from comment #9)
> Yeah, screen recording tools need to be updated for Wayland. FWIW, KDE's
> Spectacle app does screen recording now; it's built in!

Oh interesting. I use that one the most by far, but only ever for screen snips. I will try it.