Graphics

See also

Power saving for hybrid graphics is covered in Hybrid graphics.

Screen flicker

Nvidia dGPU

Affected hardware: a Dell Latitude 5480 user reported ‘screen flickers at an inconsistent rate, though not that sporadic’.

Solution: disable ASPM on battery in the configuration

PCIE_ASPM_ON_BAT=default

AMD GPU

Symptom: screen flickers once when the power source changes.

Solution: disable the radeon driver’s power saving:

RADEON_DPM_STATE_ON_AC=performance
RADEON_DPM_STATE_ON_BAT=performance

Refer to Graphics for details.

Note

Affects radeon driver only, not amdgpu.

Kernel message ‘ERROR radeon: ring 0 test failed’ on AC power

AMD GPU

Affected hardware: a Lenovo Ideapad 300 (Intel / Radeon hybrid graphics) user reported this issue.

Solution: disable DPM like this

RADEON_POWER_PROFILE_ON_AC=""

Note

Affects radeon driver only, not amdgpu.