SUMMARY *** In KDE Neon testing external monitor with a capability of 120 ghz displays only 60 when trying to set 144. Right behaviour in windows 11 and fedora 39 gnome. *** STEPS TO REPRODUCE 1. Connect an external monitor to laptop with 120 hz via USB4 type C to the display port 2. Switch refresh rate to 120 hz. OBSERVED RESULT only 60 hz EXPECTED RESULT 120 hz SOFTWARE/OS VERSIONS Windows 11: work macOS: work Linux: Fedora 39 (gnome) work KDE Neon Version: neon-testing-20240206-0538 don't work
Could you describe in more detail what the problem is? Do the display settings only allow you to go up to 60Hz, or can you set it to 120Hz but the monitor shows that it's only doing 60Hz, or does it actually go to 120Hz but feels slower than it should? Also, what exact laptop are you using?
(In reply to Zamundaaa from comment #1) > Could you describe in more detail what the problem is? Do the display > settings only allow you to go up to 60Hz, or can you set it to 120Hz but the > monitor shows that it's only doing 60Hz, or does it actually go to 120Hz but > feels slower than it should? > > Also, what exact laptop are you using? In default mode external monitor use 2560x1440@60 it works, but when I try switch to 2560x1440@120 monitor frozen about 3 seconds, firefox crashed and monitor anyway in 60 gz mode Laptop is asus rog flow x13 2023 with amd ryzem 7940hs and 780m graphics. drm info - https://drive.google.com/file/d/1q4pVVL36NOhZXQhXJQenMkFmVBX_ArJi/view?usp=sharing drm info in Fedora 39 gnome when it works properly - https://drive.google.com/file/d/1ESA4P03WMiMz_41LrZnWsLp-64waLYuL/view?usp=sharing And I see problems with graphics in 165 gz internal monitor in 60 gz on external it's ok video - https://drive.google.com/file/d/12p-dErQNivp0LI8KwWN4ZyQjBu4hWjr8/view?usp=sharing
Okay. Could you try again with KWIN_DRM_PREFER_COLOR_DEPTH=24 in /etc/environment ?
(In reply to Zamundaaa from comment #3) > Okay. Could you try again with KWIN_DRM_PREFER_COLOR_DEPTH=24 in > /etc/environment ? Thanks! It works, my external monitor is now working correctly at 120 Hz, but the internal monitor still displays graphical errors when I switch virtual desktops or the dock at the bottom changes its position
(In reply to Zamundaaa from comment #3) > Okay. Could you try again with KWIN_DRM_PREFER_COLOR_DEPTH=24 in > /etc/environment ? Internal monitor works without bugs when I switch from 165 gz to 96 or less
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Okay, both of these issues are driver bugs. You can report them at https://gitlab.freedesktop.org/drm/amd/-/issues