Comment # 20
on bug 110659
from tempel.julian@gmail.com
I forgot that I patched this PR into my Xserver: https://gitlab.freedesktop.org/xorg/xserver/merge_requests/36 It is responsible for the blocked gamma adjustment and the better desktop window performance of the modesetting Xorg driver with the experimental atomic modesetting kernel patches vs. the xf86-video-amdgpu driver. So, since everything got a bit messy, let me recap the results and add a few more details: -The experimental atomic modesetting kernel patches actually improve the performance for desktop window usage for one aspect: When I open www.vsynctester.com in Chromium and quickly hover the mouse cursor over my system tray to trigger popup windows, this doesn't result in stuttering anymore. The same applies to little text popups (e.g. URLs of links) during regular web browsing. This is the case with both modesetting and xf86-video-amdgpu, window compositing is enabled and 100% free of tearing at the same time. -But there is still stutter on www.vsynctester.com in Chromium (please don't use Firefox for this, it even stutters on MS Windows when doing this...) when I hide and show any other window, e.g. of running Dolphin file browser by clicking its starter icon in the taskbar. It's just the window that is shown and hidden, the program itself continues running all the time. This applies to both modesetting and xf86-video-amdgpu driver. -But when I apply the aforementioned "WIP: modesetting: Use atomic more atomically" patch to Xserver (additionally to the experimental atomic modesetting kernel patches), the modesetting driver is also 100% free of stutter in this situation, while the xf86-video-amdgpu-driver is not. Question is: Can this also be incorporated into the xf86-video-amdgpu driver? This would be a VAST improvement, the stuttering during gamma adjustments imho is not close to being as important. -Now back to the stutter in games when moving the mouse: This is completely untouched by all this. The xf86-video-amdgpu driver always show stuttering in the mentioned games (as long as amdgpu.dc=1), while modesetting and also xwayland don't. Oof, I hope I didn't forget anything. ;)
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