Copy of https://bugs.kde.org/show_bug.cgi?id=400097 Creating bug here because with help of KDE developer I have investigated it is amdgpu bug. For example, I'm moving cursor arrow on text. Before it turns to "I" for text selecting I clearly see the intermediate cursor texture (can't see what type is it) located right or left from current cursor position. Same when I moving cursor arrow to the border of screen to resize. It looks like glitch or flickering. It's lasting for about 2 years on different distributions. https://drive.google.com/file/d/1bV7okri0I95tkCOqo-6Z-axnN3-BXk9U/view?usp=sharing Above is link to a slo-mo video. You can clearly see what's happening when I'm moving cursor straight down from text: 1. "I" cursor 2. Arrow cursor appears 5 px left from "I" cursor 3. Arrow cursor leaps to the 15 px right-down diagonal On the monitor it looks like flickering jumping of cursor. amdgpu 18.0.1 libdrm-amdgpu1 2.4.91 linux 4.19.0 Radeon RX 570. So, kde developer said: "The issue is very likely in the video drivers, possibly not correctly syncronizing cursor position and cursor shape updates. I suggest to report it to the developers of your video drivers (your distribution might help to locate these)." Finally, I have some experiments with video driver settings and I have no issues with such options in 20-amdgpu.conf: Option "SWcursor" "true" Option "TearFree" "true" Truly said, only enabling SWcursor is enough for get rid of this bug but right after appears so much tearing (due to "KMS Pageflipping: disabled because of SWcursor" I suggest) so I needed to enable TearFree.
Maybe duplicate of Bug #106175. Can you please verify if patch from comment #55, attachment 142558 [details] [review] solve it?
Does https://gitlab.freedesktop.org/daenzer/xf86-video-amdgpu/commits/cursor-double-buffer fix it?
Hello all! (In reply to Michel Dänzer from comment #2) > Does > https://gitlab.freedesktop.org/daenzer/xf86-video-amdgpu/commits/cursor- > double-buffer fix it? Yes, it does. (In reply to Dieter Nützel from comment #1) > Maybe duplicate of Bug #106175. > > Can you please verify if patch from comment #55, > attachment 142558 [details] [review] [review] solve it? I will reply some time later. But don't you think that restoring old behaviour (as far as I understand, this is exactly what is happening) is a dirty workaround?
(In reply to Dieter Nützel from comment #1) > Maybe duplicate of Bug #106175. > > Can you please verify if patch from comment #55, > attachment 142558 [details] [review] [review] solve it? Finally I have recompile amdgpu module with this patch. This is not solving my issue, flickering still present, but I notice smoothness of pointer movement.
Merge request submitted for review: https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/14
The fix is now merged, thanks for the report and testing.
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