[Bug 110981] Glitches with amdgpu driver and QtWebEngine

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110981

            Bug ID: 110981
           Summary: Glitches with amdgpu driver and QtWebEngine
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: freedesktop at trummer.xyz

(
original bug at openSUSE bugzilla
https://bugzilla.suse.com/show_bug.cgi?id=1139011
)

Web contents rendered with QtWebEngine and the amdgpu driver have heavy
glitches since a recent update. Some examples:

- Scrollbars have glitches until a mouse over happens
- embedded videos have glitches until mouseover
- YouTube videos will lag heavily when the playback controls are displayed

The problem appears in programs that use QtWebEngine (libqt5-qtwebengine) like
KMail and Falkon.
It does not appear in Firefox which uses its own rendering engine.
It does also not appear on another machine that has an Intel iGPU when using
programs that use QtWebEngine.

Therefore I believe the problem is related to the amdgpu kernel driver and it
manifests only when using QtWebEngine, so I filed it as a kernel bug.

I'll attach some example screenshots to illustrate the issue.



System info:

Operating System: openSUSE Tumbleweed 20190621
KDE Plasma Version: 5.16.0
KDE Frameworks Version: 5.58.0
Qt Version: 5.12.3
Kernel Version: 5.1.7-1-default
OS Type: 64-bit
Processors: 12 × AMD Ryzen 5 2600X Six-Core Processor
Memory: 31,4 GiB

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