Comment 0 for bug 1661695

4.4.0-53 WORKS FINE

4.4.0-62 DOES NOT WORK (screen flickers)

It seems there is a problem with powersafe:

With auto:
echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level

you will see heavy screen flickering on higher display resolutions

With low or high:
echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level or
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

there is no screen flickering

And having performance level set to HIGH at all times is not a workaround because it wears out the card. :(

details:

Linux CINNAMON 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

```
    Vendor: X.Org (0x1002)
    Device: AMD PITCAIRN (DRM 2.43.0 / 4.4.0-62-generic, LLVM 5.0.0) (0x6811)
    Version: 17.1.0
    Accelerated: yes
    Video memory: 2048MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.2
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.0
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD PITCAIRN (DRM 2.43.0 / 4.4.0-62-generic, LLVM 5.0.0)
OpenGL core profile version string: 4.2 (Core Profile) Mesa 17.1.0-devel - padoka PPA
OpenGL core profile shading language version string: 4.20
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

```