Pour info je suis sous Wayland et F27.
$ lspci -nnk |grep -iA3 "VGA"
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Redwood PRO [Radeon HD 5550/5570/5630/6510/6610/7570] [1002:68d9]
Subsystem: ASUSTeK Computer Inc. Device [1043:036c]
Kernel driver in use: radeon
Kernel modules: radeon
$ lsmod |grep radeon
radeon 1470464 45
i2c_algo_bit 16384 1 radeon
drm_kms_helper 167936 1 radeon
ttm 98304 1 radeon
drm 372736 28 radeon,ttm,drm_kms_helper
$ glxinfo | egrep -A2 "rendering|OpenGL"
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
--
OpenGL vendor string: X.Org
OpenGL renderer string: AMD REDWOOD (DRM 2.50.0 / 4.14.13-300.fc27.x86_64, LLVM 4.0.1)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 17.2.4
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend,
GL_AMD_performance_monitor, GL_AMD_pinned_memory,
--
OpenGL version string: 3.0 Mesa 17.2.4
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend,
GL_AMD_performance_monitor, GL_AMD_pinned_memory,
--
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 17.2.4
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5,
GL_APPLE_texture_max_level, GL_EXT_base_instance,
Pour moi tout fonctionne correctement. Si ça peut aider.
Si au passage sous F27 ça coince, il faudrait aussi le retour de
$ dmesg