Created attachment 137150 [details]
In Debian testing many qt5 applications depends on the libegl1 package that is created from the libglvnd_1.0.0 sources. Original source is from Nvidia.
The presence of this package disables 2d and 3d hardware acceleration of the Mesa amdgpu driver:
[ 6.245] (EE) AMDGPU(0): eglGetDisplay() failed
[ 6.245] (EE) AMDGPU(0): glamor detected, failed to initialize EGL.
[ 6.452] (II) AMDGPU(0): Front buffer pitch: 7680 bytes
[ 6.452] (==) AMDGPU(0): DRI3 disabled
[ 6.452] (==) AMDGPU(0): Backing store enabled
[ 6.452] (WW) AMDGPU(0): Direct rendering disabled
[ 6.452] (II) AMDGPU(0): 2D and 3D acceleration disabled
[ 6.452] (==) AMDGPU(0): DPMS enabled
[ 6.452] (==) AMDGPU(0): Silken mouse enabled
[ 6.453] (II) AMDGPU(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 6.489] (--) RandR disabled
[ 6.491] (II) SELinux: Disabled on system
[ 6.491] (II) AIGLX: Screen 0 is not DRI2 capable
[ 6.491] (EE) AIGLX: reverting to software rendering
[ 6.499] (II) IGLX: enabled GLX_MESA_copy_sub_buffer
[ 6.500] (II) IGLX: Loaded and initialized swrast
[ 6.500] (II) GLX: Initialized DRISWRAST GL provider for screen 0
I am using Oibaf ppa Mesa git and this bug appeared in a couple of days. This work might have caused this bug:
mesa from oibaf ppa does not use libglvnd
Debian Buster and Sid Mesa uses libglvnd, in other words the libegl1 package. Thanks for that bomb in Debian. I did remove xorg and instaled it again, same problem with Buster and Sid, no hardware graphics acceleration. Siduction live uses Mesa 17.1.1 and there is no this bug.
-- Timo Aaltonen <firstname.lastname@example.org> Fri, 26 Jan 2018 13:48:45 +0200
-- Timo Aaltonen <email@example.com> Sat, 03 Dec 2016 02:09:57 +0200
As Timo already explained the oibaf ppa doesn't support lbglvnd.
You can't blame anybody if you install packages which doesn't include the necessary support.
Installing libegl-mesa0 package from experimental repositry fixes the bug.
Just in case someone comes from Google looking for "(EE) AMDGPU(0): eglGetDisplay() failed, followed by (EE) AMDGPU(0): glamor detected, failed to initialize EGL.", "AMDGPU(0): 2D and 3D acceleration disabled" or "AMDGPU(0): Direct rendering disabled": I upgraded from Ubuntu 17.10 to 18.04, and for some reason, two nvidia packages, libnvidia-gl-390 and libnvidia-common-390, had been installed in my system. Removing those packages fixed the problem...