[Nouveau] [Bug 78439] [NVC1] Display corruption when DP connector is reattached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78439

--- Comment #14 from Andrius Štikonas <andrius at stikonas.eu> ---
55f083c33feb7231c7574a64cd01b0477715a370 is the first bad commit which makes
the problem worse.
    drm/nouveau/disp/dp: maintain link in response to hpd signal

    This previously worked for the most part due to userspace doing a
    modeset in response to HPD interrupts.  This will allow us to
    properly handle cases where sync is lost for other reasons, or if
    userspace isn't caring.

Also, I noticed that the original problem is only present if just DP screen is
active. If I have both DP and LVDS screens active then unplugging and plugging
back DP cable does not result in display corruption.

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