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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [drm/i915] Displayport connected screen reports Signal Error after update to 5.1 kernel"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110782#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [drm/i915] Displayport connected screen reports Signal Error after update to 5.1 kernel"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110782">bug 110782</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>This is another case where something totally crazy is going on with the M/N
values:
[ 6.179040] [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m:
1703936, gmch_n: 8388608, link_m: 283989, link_n: 1048576, tu: 14
[ 6.179501] [drm:intel_dump_pipe_config [i915]] adjusted mode:
[ 6.179549] [drm:drm_mode_debug_printmodeline [drm]] Modeline "": 60 154000
1920 1968 2000 2080 1200 1203 1209 1235 0x0 0x9
[ 6.179654] [drm:intel_dump_pipe_config [i915]] crtc timings: 154000 1920
1968 2000 2080 1200 1203 1209 1235, type: 0x0 flags: 0x9
[ 6.179755] [drm:intel_dump_pipe_config [i915]] port clock: 540000, pipe src
size: 1920x1200, pixel rate 154000
Based on all those other parameters the m/n values should be like they are in
the good log:
dmesg_good_lts_4.19.46-1.txt:[ 7.986521] [drm:intel_dump_pipe_config [i915]]
dp m_n: lanes: 4; gmch_m: 1794230, gmch_n: 8388608, link_m: 299038, link_n:
1048576, tu: 14
but the values used in the bad log are the values for the previous 1680x1050
modeset. So far I can't see any way that could happen unless we somehow skipped
the encoder .compute_config() entirely.</pre>
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