https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251836
--- Comment #24 from Roman <n.diablo....@list.ru> ---
I created a file in ~/.drirc with the following content:
<driconf>
<device driver="iris">
<application name="kwin_x11" executable="kwin_x11">
<!-- https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251836 -->
<option name="glx_extension_override" value="-GLX_EXT_buffer_age"
/>
<!-- https://gitlab.freedesktop.org/mesa/mesa/-/commit/580fbbb59a60
-->
<option name="glx_disable_ext_buffer_age" value="true" />
</application>
</device>
</driconf>
Switched to the modesetting driver:
[ 148.846] (II) modeset(0): [DRI2] Setup complete
[ 148.846] (II) modeset(0): [DRI2] DRI driver: iris
[ 148.846] (II) modeset(0): [DRI2] VDPAU driver: va_gl
And kwin frozen:
kwin_x11 --replace
kwin_core: Compositing is not possible
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2561, resource
id: 29360260, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2853, resource
id: 83886134, major code: 3 (GetWindowAttributes), minor code: 0
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) UHD Graphics 620 (KBL
GT2)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.2.3
OpenGL shading language version string: 4.60
Driver: Intel
GPU class: Unknown
OpenGL version: 4.6
GLSL version: 4.60
Mesa version: 20.2.3
X server version: 1.20.9
Requires strict binding: yes
GLSL shaders: yes
Texture NPOT support: yes
Virtual Machine: no
Freeze in OpenGL initialization detected
Application::crashHandler() called with signal 6; recent crashes: 1
QSocketNotifier: Invalid socket 10 with type Read, disabling...
QSocketNotifier: Invalid socket 13 with type Read, disabling...
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