[Bug 95736] [IVB bisected] *ERROR* uncleared fifo underrun on pipe A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95736

--- Comment #13 from Tomeu Vizoso <tomeu at tomeuvizoso.net> ---
(In reply to Fabian Henze from comment #12)
> (In reply to Tomeu Vizoso from comment #11)
> > Chris, Fabian, Sedat, would you be able to find out what are the programmed
> > latencies at boot (the ones inherited from the BIOS),
> 
> If you give me some hints how to do that, I would.

It should be already printed, at least in recent kernels.
intel_print_wm_latency will tell. Could you please attach your dmesg with
drm.debug=0x1f?

> > and if a tweak similar to the one below helps avoid it?
> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> > ?id=e95a2f7509f5219177d6821a0a8754f93892ca56
> 
> Since I am using a sandy bridge notebook (1080p resolution if that matters),
> this tweak should already be in place, right?

You are right, could you please find out what's the smaller value that when
passed to ilk_increase_wm_latency() will avoid the messages?

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