[Bug 90963] [DP] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

--- Comment #88 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Not sure if it's related to this bug in particular, but what I've observed with
all Dell MST monitors I've tested is that if you reboot the machine while the
MST display is active it goes into some kind of bad state, and sometimes you
even have to physically remove the power cable from it to get it back to
normal.

To fix that I think we should gracefully shut down all displays on reboot. I've
posted a patch series to that end long ago. Someone could try to revive it and
see if it helps with any of the remaining MST issues. I've pushed an outdated
branch here: git://github.com/vsyrjala/linux.git panel_reboot_notifier_2

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