[Bug 76130] Radeon HD 4570 set dpm state fails after suspend

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Comment # 16 on bug 76130 from
It seems that the timeout is too small. A dirty fix replacing
rdev->usec_timeout with 1000000 in rv770_send_msg_to_smc
(drivers/gpu/drm/radeon/rv770_smc.c) works for me (both *ERROR*s in kernel log
disappear, performance returns to normal).


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