[Bug 107546] Screen is frozen on second connection of DP MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107546

--- Comment #48 from Shaun <shaun at tigera.io> ---
I see the same problem (screen freezes apart from mouse pointer) with a Dell
Precision 5530 and the Dell TB-16 dock on Ubuntu 18.10.  That issue seems to be
resolved by running upstream kernel v4.20.  I had previously tried v4.19 but
that still showed the issue.

Even with v4.20 I still see 

    [drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate vcpi

when plugging in the dock but the external screen works (on the displayport
anyway, I'm not sure about the HDMI port).

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