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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76130

--- Comment #16 from Evgeny Grechnikov <diamondaz+fdb at yandex.ru> ---
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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