<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91883#c34">Comment # 34</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91883">bug 91883</a>
from <span class="vcard"><a class="email" href="mailto:jimmcdevitt60@gmail.com" title="Jim <jimmcdevitt60@gmail.com>"> <span class="fn">Jim</span></a>
</span></b>
<pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=91883#c33">comment #33</a>)
<span class="quote">> There are presumably two problems mixed up in this bug:
>
> 1) PSR/DMC problems, which result in bogus looking numbers in the debug
> output
>
> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A
> (start=301707 end=301708) time 1 us, min 1073, max 1079, scanline start
> 1088, end 1080
>
> Fixing this requires avoiding PSR and/or DC5/6 while we need vblanks, and we
> need to deal with the hardware resetting various counters on DC5/6 entry.
> There have been some patches posted but nothing went in so far AFAICS.
>
> 2) Actual vblank evade problems, which result in numbers that make sense,
> just we take way too long to do things
>
> [ 4427.089764] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update
> failure on pipe A (start=146309 end=146310) time 179 us, min 1073, max 1079,
> scanline start 1071, end 1084
>
> This is most likely a regression from the improved gamma table stuff since
> we're now programming the gamma table(s) during the vblank evasion critical
> section, which is pretty bogus since those registers aren't even double
> buffered. I pointed this out but apparently no cared, and so the patches
> went in anyway. The fix would involve moving the programming to a better
> spot.</span >
commit numbers? Thanks you for the info.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>