Public bug reported:
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
```
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1661695
Title:
screen flickering raedon
Status in linux package in Ubuntu:
New
Bug description:
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
```
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