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<body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>All the numbers look very much correct :/
Does the corruption go away if you start X (or whatever) that enables the
hardware cursor? The watermark dumps at least seemed to be w/o the cursor.
I see the BIOS is pretty old. Can you try to update it?
Let's also try to figure out which watermark level is the problem.
Please do these tests with drm-tip because it might not work with an older
kernel.
First let's rule out LP3:
# echo '12 4 16 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 4 16 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?
Then LP2:
# echo '12 4 0 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 4 0 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?
And finally LP1:
# echo '12 0 0 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 0 0 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?</pre>
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