Usando o ubuntu 16.04 LTS, o seguinte erro é exibido na inicialização (placa gráfica é uma AMD R7 M445):
Oct 25 14:23:14 sampc kernel: [ 52.445958] [drm:gfx_v8_0_hw_init [amdgpu]] *ERROR* amdgpu: cp failed to lock ring (-2).
Oct 25 14:23:14 sampc kernel: [ 52.445973] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp failed to lock ring 0 (-2).
Oct 25 14:23:14 sampc kernel: [ 52.445979] [drm:amdgpu_resume [amdgpu]] *ERROR* resume 4 failed -2
Oct 25 14:23:14 sampc kernel: [ 52.445985] [drm:amdgpu_resume_kms [amdgpu]] *ERROR* amdgpu_resume failed (-2).
Oct 25 14:23:14 sampc kernel: [ 52.446153] amdgpu 0000:01:00.0: couldn't schedule ib
Oct 25 14:23:14 sampc kernel: [ 52.446175] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs (-22)
Oct 25 14:23:14 sampc kernel: [ 52.446188] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
Oct 25 14:23:14 sampc kernel: [ 52.486867] amdgpu 0000:01:00.0: couldn't schedule ib
Oct 25 14:23:14 sampc kernel: [ 52.486894] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs (-22)
Oct 25 14:23:14 sampc kernel: [ 52.486913] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
Oct 25 14:23:14 sampc kernel: [ 52.486930] amdgpu 0000:01:00.0: couldn't schedule ib
Oct 25 14:23:14 sampc kernel: [ 52.486948] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs (-22)
Oct 25 14:23:14 sampc kernel: [ 52.486963] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
Meu modelo de laptop é Dell 5567 7500u. Às vezes, ele congela no Chrome ou em algum momento no Skype e eu tenho que reiniciar. O Chrome também tem alguns problemas gráficos.