Xorg crash: GLSL 1.30 is not supported

[alkisg]

Marco 1.26.0-3ubuntu1 in Ubuntu 22.04 with certain graphics cards and applications is causing Xorg crashes with the following message:

Failed to compile FS: 0:1(10): error: GLSL 1.30 is not supported. Supported versions are: 1.10, 1.20, and 1.00 ES

Replacing it with xfwm4 or with marco 1.24.0-1ubuntu2 resolves the issue. Running marco --no-composite does not help.

I suspect that it affects all graphics cards/drivers that don't provide GLSL 1.30. One affected graphics card is:

00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02)
    Subsystem: Lenovo Core Processor Integrated Graphics Controller [17aa:3920]
    Kernel driver in use: i915
    Kernel modules: i915

One way to reproduce the issue is to run a VNC application fullscreen. I'm attaching the related Xorg.0.log.old, you can see the crash at its end.

Xorg.0.log.txt

[kgidarakos]

This issue affects me too.

[alkisg]

Attaching glxinfo.txt from an affected client.

It seems like marco is calling some Xorg function that other display managers do not call; then Xorg crashes. So it might not be a marco issue after all, but a Xorg or glamoregl issue. This one seems similar.

Workarounds so far:

• Use Driver "intel" in xorg.conf (for those using LTSP, it's X_DRIVER=intel in ltsp.conf).
• Or put xserver-command=env MESA_GL_VERSION_OVERRIDE=2.1 X in lightdm.conf (for LTSP, it's LIGHTDM_CONF="xserver-command=env MESA_GL_VERSION_OVERRIDE=2.1 X").

[fottsia]

Attaching glxinfo.txt, lspci.txt and Xorg.log.txt from another affected client, after the xserver-command workaround was applied.

[alkisg]

Even though marco could be patched to avoid the problematic Xorg calls, this issue probably needs to be reported and fixed in glamor, not here. Closing.