[Bug 76490] Hang during boot when DPM is on (R9 270X)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76490

--- Comment #23 from dex+fdobugzilla at dragonslave.de ---
I did some checks using the old profile based aproach for PM and switched
between the states.

Following are the data from /sys/kernel/debug/dri/0/radeon_pm_info when
switching via echo X  >  /sys/class/drm/card0/device/power_profile 

Default:
=================================
default engine clock: 1080000 kHz
current engine clock: 149990 kHz
default memory clock: 1400000 kHz
current memory clock: 149990 kHz
voltage: 1206 mV
PCIE lanes: 8

Low:
=================================
default engine clock: 1080000 kHz
current engine clock: 299990 kHz
default memory clock: 1400000 kHz
current memory clock: 149990 kHz
voltage: 875 mV
PCIE lanes: 8

Mid:
=================================
default engine clock: 1080000 kHz
current engine clock: 299990 kHz
default memory clock: 1400000 kHz
current memory clock: 149990 kHz
voltage: 875 mV
PCIE lanes: 8

High:
=================================
default engine clock: 1080000 kHz
current engine clock: 1080000 kHz
default memory clock: 1400000 kHz
current memory clock: 1399990 kHz
voltage: 1206 mV
PCIE lanes: 8

The last state (high) results in immediate freeze.

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