[Bug 94250] Intel driver crashes when undocking Lenovo T450s

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94250

--- Comment #12 from cs_gon at yahoo.com ---
The last two patches may have fixed it, or at least made things a lot better. 

I found out before, that disconnecting the external monitor from the docking
station, instead of undocking the notebook, did cause this problem more
frequently (maybe 75% of the time), and I was now unable to reproduce the issue
when disconnecting the monitor.

Though during a lot of docking and undocking, I got this assertion one time:
(EE) sna_dri2_schedule_flip:3080 assertion 'info->front == NULL' failed

I will attach the Xorg log and stack trace again.

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