Force 8bit RGB config

[Timo Aaltonen]

New mesa supports 10bit RGB configs, and this causes issues with cogl/mutter which get a random EGLConfig that breaks some autopkgtests. To fix this this merge request is needed for mutter

https://gitlab.gnome.org/GNOME/mutter/merge_requests/36

and a similar one for cogl.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

This bug was fixed in the package mesa - 18.0.0~rc4-1ubuntu3

---------------
mesa (18.0.0~rc4-1ubuntu3) bionic; urgency=medium

  * dont-enable-10bpc-by-default.diff: Replace the drirc hack, just flip
    the default to not enable 10bpc configs by default for gallium drivers.
    (LP: #1752123)

 -- Timo Aaltonen <email address hidden> Wed, 28 Feb 2018 19:34:58 +0200

[Daniel van Vugt (vanvugt)]

Any chance we could fix the aforementioned tests?

I've got 10-bit monitors I've been waiting to use with deep colour for years. It would be nice if we could make it work now Mesa 18 is ready.

[Timo Aaltonen (tjaalton)]

You still can, by setting "allow_rgb10_configs" true in drirc for gnome-shell. Only the driver defaults were flipped.

Note that the modesetting driver does not support it, only after we get xserver 1.20 in 18.10. So for Intel hw you'd need to use the -intel driver until then.

[Launchpad Janitor (janitor)]

This bug was fixed in the package mutter - 3.27.92-1

---------------
mutter (3.27.92-1) experimental; urgency=medium

  * New upstream release candidate (LP: #1752123, LP: #1718238)
  * Bump minimum wayland-protocols to 1.12
  * Drop bump-api.patch: Applied in new release

 -- Jeremy Bicha <email address hidden> Mon, 05 Mar 2018 20:38:24 -0500

[Daniel van Vugt (vanvugt)]

That's fine. I knew I was aiming for Wayland sessions on 10-bit support, not Xorg. It might also take some additional mutter work.