linux-kernel - [v4.7-rc5] i915: *ERROR* (CPU pipe|PCH transcoder) A FIFO underrun

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Date:	Mon, 27 Jun 2016 08:38:53 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Bainbridge <chris.bainbridge@...il.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [v4.7-rc5] i915: *ERROR* (CPU pipe|PCH transcoder) A FIFO underrun

Hi Daniel,

I had already reported this issue in a email-thread called
"[v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU pipe/PCH transcoder" A
FIFO underrun".

This is still happening here on Sandybridge (and Ivybridge GPU
reported by Chris Bainbridge).
I have updated the bug-report in [1].

Chris B. reports in the BR:

"Bisect result:

ed4a6a7ca853253f9b86f3005d76345482a71283 is the first bad commit
commit ed4a6a7ca853253f9b86f3005d76345482a71283
Author: Matt Roper <matthew.d.roper@...el.com>
Date:   Tue Feb 23 17:20:13 2016 -0800

    drm/i915: Add two-stage ILK-style watermark programming (v11)"

Any news on that issue?

Regards,
- Sedat -

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