[Bug 95471] Lenovo L460: Hard lockup with external monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95471

--- Comment #4 from direx at betriebsdirektor.de ---
I spoke too soon in comment #c0 - I am also getting the "CPU pipe A FIFO
underrun" on 4.6 stable (when in Ultra Dock).

Lockup-wise there is one big difference between 4.6 stable and
intel-drm-nightly:

On 4.6 I am only getting random lockups on shutdown/reboot (suspend works,
though). This means I can work sort of normally on 4.6 stable.

On intel-drm-nightly I am getting these lockups within an X session, after some
(between 5 and 90?) minutes of normal work.

I'd like to help nailing this down further, but unfortunately hard lockup means
there is no stacktrace and zero interaction possibility for me (CAPS lock LED
on external keyboard is also dead). I also could not get SysRq to work to at
least display something useful. Any advice on how I could provide more useful
information is also appreciated.

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