[Bug 104980] NULL pointer in drm_dp_mst_wait_tx_reply / hotplugging via DP MST hub causes oops

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104980

--- Comment #5 from Adam Nielsen <a.nielsen at shikadi.net> ---
Been running this for a while and confirming that yes indeed it seems to be
fixed.

There is still an issue whereby if the system activates DPMS suspend while the
monitors are off then they don't appear to come back on properly, with "xrandr"
initially not showing displays behind the MST hub (but having them show on
subsequent runs, while all monitors still remain in DPMS suspend).

The solution seems to be to get DPMS mode off again (press a key or SSH in and
run "xset dpms force on") then powercycle the displays again, and then they
will all return to normal operating mode.

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