Bug#907698: libdrm2: regression: breaks firefox WebGL

[Jörg-Volker Peetz <jvpeetz@web.de>]

Package: libdrm2
Version: 2.4.94-1
Severity: normal

Dear Maintainer(s),

since update to version 2.4.93-1 the Hardware support in firefox is
broken. Calling for example https://get.webgl.org/ shows the text

"While your browser seems to support WebGL, it is disabled or
unavailable."

In the log file of xinit the following message appears:

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

I'm not sure if this is the package to blame, maybe it's libdrm-intel1
or something else. Firefox is version 61.0.1-1, xorg-xserver is 2:1.20.1-1, mesa
is 18.1.7-1.

The Hardware is Intel graphics. glxinfo shows among others

direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4

    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) HD Graphics 630 (Kaby Lake GT2)  (0x5912)
    Version: 18.1.7
    Accelerated: yes
    Video memory: 3072MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2

Any idea?

Regards,
Jörg.


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (600, 'testing'), (500, 'unstable'), (5, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.5 (SMP w/8 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8
(charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages libdrm2 depends on:
ii  libc6          2.27-5
ii  libdrm-common  2.4.94-1

libdrm2 recommends no packages.

libdrm2 suggests no packages.

ii  firefox        61.0.1-1

-- no debconf information