[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #49 from Thomas DEBESSE <dev at illwieckz.net> ---
Hey, it's awesome, the workaround Lauri Gustafsson found is working well!

I just do that at after my computer startup:

```
service 'gdm' stop

echo 'high' > '/sys/class/drm/card0/device/power_dpm_force_performance_level'
echo 'performance' > '/sys/class/drm/card0/device/power_dpm_state'

service 'gdm' start
```

Then it works! I was able to run the Unigine Valley and Heaven Benchmarks for
the first time wit dpm enabled, without crashing at startup, and with descent
performances.

If I don't do that and keep the dpm default config, my system crashes some
minutes after startup (and for sure when running on heavy benchmarks like those
ones).

I own a MSI R9 390X. In the past I wrote some details on bug 93288 . I'll
upload my vbios soon. There is some strings like that inside:

```
05/21/15 03:39
MS-V30823-F2
GRENADA
PCI_EXPRESS
GDDR5
113-MSITV308MH.201                                                          
(C) 1988-2010, Advanced Micro Devices, Inc.
ATOMBIOSBK-AMD VER015.048.000.062.000000
V30830SC.bin
MSI_GRENADA_V30823XT_C67201_A0_GDDR5_8GB_30S\config.h
AMD ATOMBIOS
```

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