[Bug 108132] Intel 8550U with 620UHD GPU

[bugzilla-daemon at freedesktop.org]

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

--- Comment #74 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Looking at dump_pipe_config, I don't see big differences.

setup_hw_state:
[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

Only thing in link is:

modeset:
[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

Doubt that causes it..

But could always try a lower m/n value..

In i915/intel_dp.c:
        bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
                                           DP_DPCD_QUIRK_CONSTANT_N);

Change to
bool constant_n = true;

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