[Bug 89055] [SKL APL] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89055

--- Comment #42 from Marco Trevisan (Treviño) <mail at 3v1n0.net> ---
(In reply to Prasad H L Bhat from comment #34)
> I get the same error sometimes on my T460 laptop with Intel HD Graphics 520.
> When it occurs, it freezes the laptop completely (display turns off, no
> virtual terminals work, audio buffer keeps looping if present when freezing).

Same in a T460p, using the Ultra Dock station connected via HDMI to an external
monitor (that actually routes through DP3-1).

I see these errors multiple times, and I also experience some hangs where I see
visual corruptions in monitor. Not sure this can be related, but indeed it has
something to do with intel.

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