Bug 498572 - Unable to get refresh rate higher than 120Hz on Xiaomi Monitor
Summary: Unable to get refresh rate higher than 120Hz on Xiaomi Monitor
Status: REPORTED
Alias: None
Product: KScreen
Classification: Plasma
Component: common (show other bugs)
Version: 6.2.5
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: kscreen-bugs-null@kde.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-01-12 20:18 UTC by Luis Mayo
Modified: 2025-01-16 15:07 UTC (History)
1 user (show)

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Description Luis Mayo 2025-01-12 20:18:29 UTC
SUMMARY
Trying to set my Xiaomi P27FBB-RGGL monitor to any frequency higher than 120HZ doesn't work. Plasma enters a weird state where the screens are constantly flapping between On and Off, the "device connected/disconnected" jingles also start playing.
The only solution at this point is plug the HDMI cable (auto-revert doesn't work somehow?)

STEPS TO REPRODUCE
1. Plug a Xiaomi P27FBB-RGGL monitor via HDMI
2. Change it's frequency to 144 or 165 using System Settings

OBSERVED RESULT
As described, Plasma enters a connect/disconnect loop

EXPECTED RESULT
1. It works properly
2. If it doesn't work properly at least it reverts back to previous frequency automatically, stopping the loop
3. (this is more of a feature request). If it doesn't revert automatically, System settings should ideally have a "forget all displays) button so I don't have to manually remove settings files and restart

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1

ADDITIONAL INFORMATION
I know this is a hard issue for you guys to debug so I hope i can help you with anything you guys need.
I'm running Nobara Linux 41 (based of Fedora KDE 41) with Nvidia GPU (I've tried both with Optimus enabled and disabled through UEFI) on a Laptop
Comment 1 Nate Graham 2025-01-13 19:39:41 UTC
Does this happen on X11, or Wayland, or both?
Comment 2 Luis Mayo 2025-01-13 19:56:28 UTC
Problem was noticed on Wayland. My distro doesn't really offer X11 support by default. But I was able to install verison 6.2.4 of plasma with X11 support and after checking the error is still present there.