[Bug 94605] [SKL] Flashing black screen ([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=94605

--- Comment #97 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to Dominik Klementowski from comment #96)
> (In reply to Paulo Zanoni from comment #94)
> > (In reply to Dominik Klementowski from comment #92)
> > > Latest intel-drm-nightly solved a lot of issues for my graphics - Intel HD
> > > 520 (Skylake GT2) with Core i5-6200U (it's Acer E5 laptop). 
> > > 
> > > BOOT_IMAGE=/boot/vmlinuz-4.9.0-994-generic root=... ro i915.enable_rc6=0
> > > quiet splash
> > 
> > Why are you using i915.enable_rc6=0? Please test again without that.
> 
> Ok, I can confirm now - without parameter i915.enable_rc6=0 flickering is
> still present and pretty often (more than once per minute I guess).
> I have todays' intel-drm-nightly kernel.
> dmesg is clear. I only have some pcie errors

Wow. Can you please boot with drm.debug=0x1e i915.enable_rc6=1 and then retest,
reproduce the problem, and attach the dmesg output here? (don't forget the
drm.debug)

Also, it would be good to know the exact model of your laptop. We're trying to
find which machines have these flickering issues. Your dmesg says "Aspire
E5-574", but it looks like there are multiple models for the E5-574 laptop, so
I'd like to know the "full name" in case you have it.

Also, can you please do another test? Just "sudo mv /lib/firmware/i915
/root/backup-lib-firmware-i915", then reboot and check if the problem persists.

All tests should be *without* the i915.enable_rc6=0 option.

Thanks,
Paulo

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