Fwd: [Qt bugreports] Updates for QTBUG-135786: WebEngine in 6.9.0 with an AMD GPU and on both Wayland/X11 renders gltiches instead of text

[Dieter Nützel]

Hello radeonsi / RADV ACO fellows,

found the solution for the below Qt 6.9.0 (maybe former) AMD  radeonsi 
(Vulkan/RADV) rendering issue.

ACO is the culprit (for radeonsi at least).


AMD_DEBUG=usellvm SOLVED it on my side.

Have to open a Ticket on gitlab.

Greetings,
Dieter

-------- Originalnachricht --------
Betreff: [Qt bugreports] Updates for QTBUG-135786: WebEngine in 6.9.0 
with an AMD GPU and on both Wayland/X11 renders gltiches instead of text
Datum: 22.04.2025 04:24
Von: Dieter Nützel (via JIRA) <jira-noreply at qt-project.org>
An: dieter at nuetzel-hh.de



  		There are 3 comments.

  		 Qt [1]
  		 /

  		 QTBUG-135786 [2]
  		 Reported

WEBENGINE IN 6.9.0 WITH AN AMD GPU AND ON BOTH WAYLAND/X11 RENDERS
GLTICHES INSTEAD OF TEXT

  		 View issue [2]   ·   Add comment [3]

  3 COMMENTS

  		 Dieter Nützel on 22 Apr '25 04:12

  (For me) It is an

Mesa git radeonsi (amdgpu) ACO driver bug.

When I disable ACO (AMD_DEBUG=usellvm)

Issue is SOLVED.

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
*LLVM* 21.0.0, DRM 3.61, 6.14.3
-2.g493ad77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

  BAD

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
{*} ACO {*} , DRM 3.61, 6.14.3-2.g493a
d77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

Reporting upstream (Mesa Devel)

  		 Dieter Nützel on 22 Apr '25 04:13

  (For me) It is an

  * Mesa git radeonsi * (amdgpu) * ACO * driver {*} bug {*} .

When I disable * ACO * ( {*} AMD_DEBUG=usellvm {*} )

Issue is {*} SOLVED {*} .

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
*LLVM* 21.0.0, DRM 3.61, 6.14.3
-2.g493ad77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

BAD

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
{*}ACO{*}, DRM 3.61, 6.14.3-2.g493a
d77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

Reporting upstream (Mesa Devel)

  		 Dieter Nützel on 22 Apr '25 04:13

  (For me) It is an

*Mesa git radeonsi* (amdgpu) *ACO* driver {*}bug{*}.

When I disable *ACO* ({*}AMD_DEBUG=usellvm{*})

Issue is {*}SOLVED{*}.

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
*LLVM* 21.0.0, DRM 3.61, 6.14.3
-2.g493ad77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

  * BAD *

OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10,
{*}ACO{*}, DRM 3.61, 6.14.3-2.g493a
d77-default)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.2.0-devel
(git-c643f62633)

Reporting upstream (Mesa Devel)

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Links:
------
[1] https://bugreports.qt.io/browse/QTBUG
[2] https://bugreports.qt.io/browse/QTBUG-135786
[3] https://bugreports.qt.io/browse/QTBUG-135786#add-comment
[4] 
https://confluence.atlassian.com/display/JIRAKB/Image+attachments+are+not+displayed+in+emails