[Bug 79806] New: Performance degradation after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79806

          Priority: medium
            Bug ID: 79806
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Performance degradation after resume
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: enyecz at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

I have a Radeon HD 4350/4550 (RV770) card in my notebook. After resuming from
suspend, there is a significant 3D performance drop (a bit less than 1/4 of
original performance remains). The performance drop is exactly at the same
level as it is after "echo low >
/sys/class/drm/card0/device/power_dpm_force_performance_level", albeit
power_dpm_force_performance_level still contains "auto".

Bug is found in Ubuntu 14.04, but it was there at least since 13.10 (I have
just found the workaround). The bug is there with kernel 3.13 (official), with
3.14 mainline and 3.15-RC8 which was build for Ubuntu 14.10.

Workaround: when resume, execute "echo auto >
/sys/class/drm/card0/device/power_dpm_force_performance_level".

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20140608/bd092b79/attachment.html>