[Bug 107141] Manual setting of pp_dpm_sclk resets after monitor off/on (rx 480)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107141

            Bug ID: 107141
           Summary: Manual setting of pp_dpm_sclk resets after monitor
                    off/on (rx 480)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: krystian.zajdel at gmail.com

Created attachment 140483
  --> https://bugs.freedesktop.org/attachment.cgi?id=140483&action=edit
dmesg

Manual setting of pp_dpm_sclk resets after monitor off/on. 

1.setting:
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 2 > /sys/class/drm/card0/device/pp_dpm_sclk
echo 95 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1

2. checking:
cat /sys/class/drm/card0/device/pp_dpm_sclk 
0: 300Mhz 
1: 608Mhz 
2: 910Mhz *
3: 1077Mhz 
4: 1145Mhz 
5: 1191Mhz 
6: 1236Mhz 
7: 1303Mhz 

cat /sys/class/drm/card0/device/power_dpm_force_performance_level
manual

cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
91

3. switching monitor off/on

4. checking again:
cat /sys/class/drm/card0/device/pp_dpm_sclk 
0: 300Mhz 
1: 608Mhz 
2: 910Mhz 
3: 1077Mhz 
4: 1145Mhz 
5: 1191Mhz 
6: 1236Mhz 
7: 1303Mhz *

cat /sys/class/drm/card0/device/power_dpm_force_performance_level
manual

cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
91




The card is under opencl load (blender) but the problem exists regardless of
the load.
So, the dpm_performance_level still says manual but the clock is changed to
auto again.

GPU: rx480 (MSI) connected via DisplayPort (I didn't try HDMI) 
OS: Slackware current
Affected kernels (that I've tried): 4.17.1, 4.17.2, 4.17.3, 4.18rc3,
4.18.0-rc1-custom-g6becad35ec8a-dirty

Kernels that work properly (the ones I've tried): 4.16.14, 4.16.15, 4.16.17.


It's my first bug report so I apologize in advance for any mistakes.

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