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?
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https://bugs.launchpad.net/bugs/1785912
Title:
Horizontal screen flicker Intel UHD graphics 620 (rev 07) Lenovo
Ideapad 720s 13IKB 81BV
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