[Bug 103643] [Lenovo ThinkPad T450s] Issues after docking and locking: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103643

--- Comment #12 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Alexander Kops from comment #11)
> Created attachment 135451 [details]
> kern.log with running drm-tip kernel from today - Computer froze at 16:17:45
> 
> I'll attach this current kern.log. This time the situation was a bit
> different, I didn't find the notebook turned off, but the power light was
> still on, but all three screens were black and it didn't react to anything.
> So I had to hard reboot it.
> 
> Maybe you can see something in the logs that would lead to a follow up bug
> report?
> 
> The last thing I see in the log before the crash are a bunch of 
> 
> [drm:drm_mode_addfb2 [drm]] [FB:87]
> 
> lines.

Nothing interesting there unfortunately. So I guess we're dealing with some
kind of hard system hang, and it doesn't manage to write anything useful to the
logs. So it's not even clear whether this has anything to do with i915, or
caused by something totally different. Maybe try netconsole/serial console if
the machine has a ethernet/serial port. Or you may want to look into pstore to
see if that might catch something when the machine dies.

Maybe also enable various debug features in the kernel config:
CONFIG_LOCKUP_DETECTOR=y
CONFIG_SOFTLOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR=y
CONFIG_DETECT_HUNG_TASK=y
CONFIG_PROVE_LOCKING=y

PS. Your logs are huuuuge. Might want to trim away the unrelated boots from the
logs.

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