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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb i915] DP Flicker"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73943#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb i915] DP Flicker"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73943">bug 73943</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=73943#c5">comment #5</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=73943#c4">comment #4</a>)
> > Flickering due to underrun tends to be much more regular in its
> > content, the screen either wholly (or more usually partially) flickers to
> > black (or another colour), or sometimes part of the screen changes colour.
> A single pane goes entirely black for a few seconds then comes back on. I
> don't see any discoloration or tearing or any other visual artifacts.</span >
Just one out of a pair? The ddx uses (in most circumstances anyway) a single fb
for both and flips both at the same time. This observation leads me to think it
is underruns...
<span class="quote">> > if the flicker shows up in a screencast (i.e. when recording the frontbuffer
> > of the display) that implies that the error is at an even higher level of
> > the stack.
> Any screencast apps that you recommend I try? Or just anything?</span >
Any tool. All that we want to verify is that there is no corruption in the root
image, so anything that uses XGetImage or DRI2 reads from the frontbuffer will
be adequate.</pre>
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