[Bug 47428] New: mouse input skipping / jitter in conjunction with xf86-video-amdgpu in almost every game

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=47428

            Bug ID: 47428
           Summary: mouse input skipping / jitter in conjunction with
                    xf86-video-amdgpu in almost every game
           Product: Wine
           Version: 4.10
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: tempel.julian at gmail.com
      Distribution: ---

There is extreme mouse skipping in various games. This happens mostly with
vsync, e.g. in TESV: Oblivion, but it can also occur without vsync, though more
subtle (e.g. in Hitman 2 of 2018).
Performance in general is fine, also when there is keyboard input. But as soon
as there is any mouse movement, either extreme frametime spikes happen or the
mouse input is jittery in general:
https://abload.de/img/screenshot_20190527_1t1ktp.png


This happens only when both xf86-video-amdgpu and amdgpu.dc=1 (default since
Linux 4.17, required for FreeSync and GPUs since Vega) are used at the same
time.
With modesetting Xorg DDX driver, the issue does not occur. However, it doesn't
support FreeSync and enforces vsync all the time with amdgpu.dc=1, which is not
great either.

This is not limited to WineD3D, it happens with Gallium Nine and DXVK as well.

There also is this ticket for the xf86-video-amdgpu driver regarding this
issue, but no solution has been proposed so far:
https://bugs.freedesktop.org/show_bug.cgi?id=110659

Only games in Wine seem to be affected, native modern Linux games like Rise of
the Tomb Raider (Vulkan) or Hitman 2016 (OpenGL) don't show this issue.
Thus perhaps there is the slight chance that the issue can be fixed in Wine, if
nothing happens for the xf86 driver.

It seems to happen with recent and older Wine versions. I tested regular wine
4.11 and Proton 3.7-8.
Attached is a log file for TESV: Oblivion, but I suppose it doesn't show
anything interesting. I decided to classify this issue as "major", as it
doesn't seem to be limited to single titles and can render games unplayable.

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