Bug 450087

Summary: UI does not show correct refresh rate after you change the resolution
Product: [Applications] systemsettings Reporter: Riccardo Robecchi <sephiroth_pk>
Component: kcm_kscreenAssignee: kscreen-bugs-null <kscreen-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: kde, nate, plasma-bugs, vlad.zahorodnii, xaver.hugl
Priority: NOR    
Version: 5.24.0   
Target Milestone: ---   
Platform: Neon   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Riccardo Robecchi 2022-02-12 15:04:46 UTC 
SUMMARY
My TV supports resolutions up to 4K and different refresh rates apply for each resolution. When I change from one resolution to another (in the specific case, from 4K to FHD), I still see the refresh rates of the first resolution. So in my case, 4K supports up to 30 Hz, while FHD goes up to 120 Hz; switching from 4K to FHD shows the correct resolution, but the UI keeps on saying that the TV is at 30 Hz when really it is working at 120 Hz. Clicking on another KCM (e.g. compositor) and then coming back to the KScreen KCM shows the correct refresh rates.

Oddly enough, this does not apply in reverse: if I switch from FHD at 60 Hz to 4K, the new refresh rate of 30 Hz is correctly detected and shown by the KCM.

STEPS TO REPRODUCE
1. Switch from one resolution with low refresh rate to another with a high refresh rate.

OBSERVED RESULT
The refresh rate is not updated and is therefore shown incorrectly.

EXPECTED RESULT
The refresh rate is updated and shown correctly.

SOFTWARE/OS VERSIONS
Linux: KDE neon
KDE Plasma Version: 5.24.0
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
This happens in X11 on a desktop machine with just one monitor, which is an LG webOS TV, using an AMD Radeon RX 5700 with the latest Mesa drivers and Linux 5.15.22. The TV is connected through an HDMI cable.
Comment 1 Nate Graham 2022-02-14 17:31:22 UTC 
Does it happen on Wayland too?
Comment 2 Riccardo Robecchi 2022-02-14 18:08:28 UTC 
As mentioned in the other bug: I have no idea, I don't use Wayland and the session doesn't work, so I have no way to check this.
Comment 3 David Redondo 2022-09-23 12:46:30 UTC 
I see this too
Comment 4 Zamundaaa 2022-09-24 22:31:53 UTC 
I'm very certain that this bug has been fixed with 5.24.6 / 5.25.0 (https://invent.kde.org/plasma/kscreen/-/commit/6ecb832923612820c721f58d1d12dd176e10528a) and it's still working correctly here

 (In reply to David Redondo from comment #3)
> I see this too
This bug report is about the refresh rate list not adding or removing the refresh rates of the currently selected resolution, are you talking about the same thing? 
Because KScreen auto-selects the current refresh rate whenever you change the resolution, that's intentional and not a bug (though it auto-selecting the highest refresh rate would probably make more sense)
Comment 5 David Redondo 2022-09-26 09:18:58 UTC 
I will double check but it could also be only an issue in the UI if it sitll happens.
Comment 6 Nate Graham 2022-11-12 15:07:02 UTC 
Was anyone able to reproduce the issue in Plasma 5.24.6 or 5.25.0 or later?
Comment 7 Bug Janitor Service 2022-11-27 05:12:40 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 8 Bug Janitor Service 2022-12-12 05:07:23 UTC 
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!