[Bug 89055] [SKL ] 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 #14 from Andreas Rottmann <me+bugzilla at rotty.xx.vu> ---
I can confirm this, with the following setup:

- Linux 4.3.0 (vanilla source tree, built with Debian's make-kpkg, kernel
config derived from Debian distro kernels)
- Debian testing (stretch), amd64
- Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz
- Dual-monitor setup, one connected directly to DVI, the other attached via
DisplayPort<->DVI adapter

It seems I can reliably trigger the WARN_ON(!wm_changed) condition by switching
between the monitors. 

Besides the backtrace-spam in my log, the system seems to run fine, no hangs,
crashes, or the like (running Xorg from stretch with i3-wm). 

I notice scrolling-related artifacts in conkeror, but that may be a totally
unrelated issue.

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