Bug#956665: libdrm2: Update broke firefox WebGL

[Fabian Inostroza <soulsonceonfire@gmail.com>]

Package: libdrm2
Version: 2.4.101-1
Severity: normal

Dear Maintainer,

After updating libdrm2 from 2.4.100-4 to 2.4.101-1 WebGL stopped working on
firefox (using esr from repos and tar from mozilla).

After loading a WebGL sample from webglsamples.org the following is message is
shown in the web console:
Error: WebGL warning: <SetDimensions>: Failed to create WebGL context: WebGL creation failed: 
* tryNativeGL
* Exhausted GL driver options.

and in the terminal where firefox was launched:
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: MESA-LOADER: failed to retrieve device information


Looks similar to #907698.

Regards.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-4-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=es_CL.UTF-8, LC_CTYPE=es_CL.UTF-8 (charmap=UTF-8), LANGUAGE=es_CL:es (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libdrm2 depends on:
ii  libc6          2.30-4
ii  libdrm-common  2.4.101-1

libdrm2 recommends no packages.

libdrm2 suggests no packages.

-- no debconf information