[Bug 108132] Intel 8550U with 620UHD GPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108132

--- Comment #101 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
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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