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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel 8550U with 620UHD GPU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108132#c101">Comment # 101</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel 8550U with 620UHD GPU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108132">bug 108132</a>
from <span class="vcard"><a class="email" href="mailto:bugs@mblankhorst.nl" title="Maarten Lankhorst <bugs@mblankhorst.nl>"> <span class="fn">Maarten Lankhorst</span></a>
</span></b>
<pre>Working (fastset at boot):
[ 3.494890] [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m:
6213395, gmch_n: 8388608, link_m: 517782, link_n: 524288, tu: 64
Broken (modeset):
[ 192.531640] [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m:
6213395, gmch_n: 8388608, link_m: 1035565, link_n: 1048576, tu: 64
in intel_dp.c:
bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
DP_DPCD_QUIRK_CONSTANT_N);
Replace with
bool constant_n = true;
And rebuild.
Could you test if it works then?</pre>
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