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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - RV770 - screen flicker with radeon.dpm=1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73067#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - RV770 - screen flicker with radeon.dpm=1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73067">bug 73067</a>
from <span class="vcard"><a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=73067#c9">comment #9</a>)
<span class="quote">> Yes, the attached patch fixed the flicker. Screen does not flick whichever
> value is power_dpm_state or power_dpm_force_performance_level.
>
> Before the patch, the flicker happened when switching from
> power level 2 sclk: 66500 mclk: 95000 vddc: 1082
> to
> power level 1 sclk: 50000 mclk: 70000 vddc: 1046
>
> In the way level 1 -> level 2 there is not screen flicker.</span >
The flicker is caused by the mclk transition. It some cases it seems to take
longer than the vblank period which is why you are seeing the flicker.</pre>
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