[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

Johannes Berg <johannes at sipsolutions.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #17 from Johannes Berg <johannes at sipsolutions.net> ---
FWIW, I don't actually know of a way of *triggering* this. It seems to just
happen all by itself, sometimes with lots of screen activity, sometimes with
none at all.

I noticed that this message *sometimes* seems to coincide with the issue:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO
underrun

but I suppose that's just be a symptom of the issue, rather than the cause,
since it doesn't *always* happen.


Your script doesn't actually work:

jberg1-mobl2:/sys/kernel/debug/dri/0# for plane in pri cur spr; do
> cat i915_${plane}_wm_latency
> wm0=$(head -1 i915_${plane}_wm_latency|cut -d' ' -f2)
> echo $wm0 1000 1000 1000 1000 > i915_${plane}_wm_latency
> done
WM0 2 (2.0 usec)
WM1 19 (19.0 usec)
WM2 28 (28.0 usec)
WM3 32 (32.0 usec)
WM4 63 (63.0 usec)
WM5 77 (77.0 usec)
WM6 83 (83.0 usec)
WM7 99 (99.0 usec)
bash: echo: write error: Invalid argument
WM0 2 (2.0 usec)
WM1 19 (19.0 usec)
WM2 28 (28.0 usec)
WM3 32 (32.0 usec)
WM4 63 (63.0 usec)
WM5 77 (77.0 usec)
WM6 83 (83.0 usec)
WM7 99 (99.0 usec)
bash: echo: write error: Invalid argument
WM0 2 (2.0 usec)
WM1 19 (19.0 usec)
WM2 28 (28.0 usec)
WM3 32 (32.0 usec)
WM4 63 (63.0 usec)
WM5 77 (77.0 usec)
WM6 83 (83.0 usec)
WM7 99 (99.0 usec)
bash: echo: write error: Invalid argument

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