01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M] [1002:6720]

I don't use dpm, but a profile method. Right after booting (without touching power_profile) I can suspend & resume as many times as I want (tested with ~50 s&r routines).

Starting with: commit 6c7bccea390853bdec5b76fe31fc50f3b36f75d5 Author: Alex Deucher alexander.deucher@amd.com Date: Wed Dec 18 14:07:14 2013 -0500

drm/radeon/pm: move pm handling into the asic specific code

We need more control over the ordering of dpm init with respect to the rest of the asic. Specifically, the SMC has to be initialized before the rlc and cg/pg. The pm code currently initializes late in the driver, but we need it to happen much earlier so move pm handling into the asic specific callbacks.

This makes dpm more reliable and makes clockgating work properly on CIK parts and should help on SI parts as well.

Signed-off-by: Alex Deucher alexander.deucher@amd.com

I can't successfully resume using "low" power_profile. My testing looks like this: boot s & r (result: GOOD) s & r (result: GOOD) s & r (result: GOOD) echo "low" > /sys/class/drm/card0/device/power_profile s & r (result: BAD)

BAD means display corruption [0] and: [ 80.244475] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD) [ 80.244475] [drm:evergreen_resume] *ERROR* evergreen startup failed on resume

[0] http://files.zajec.net/barts-low-resume-corruption.jpeg