[Intel-gfx] intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Vudum, Lakshminarayana lakshminarayana.vudum at intel.com
Mon May 18 07:43:06 UTC 2020

Arno, I have created bug https://gitlab.freedesktop.org/drm/intel/-/issues/1900 for this issue.
Now discussions can happen in the bug report directly. Thanks for reporting the issue.

From: Saarinen, Jani <jani.saarinen at intel.com>
Sent: Monday, May 18, 2020 10:21 AM
To: Arno <star at gmx.li>; intel-gfx at lists.freedesktop.org; chris at chris-wilson.co.uk; Vudum, Lakshminarayana <lakshminarayana.vudum at intel.com>
Subject: RE: [Intel-gfx] intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Please make gitlab issue if not already done. Lakshmi, please guide.

From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org<mailto:intel-gfx-bounces at lists.freedesktop.org>> On Behalf Of Arno
Sent: maanantai 18. toukokuuta 2020 10.07
To: intel-gfx at lists.freedesktop.org<mailto:intel-gfx at lists.freedesktop.org>; chris at chris-wilson.co.uk<mailto:chris at chris-wilson.co.uk>
Subject: Re: [Intel-gfx] intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Is there another place to report this kind of issue? Didn't get any feedback. Did I make mistakes in my mail? I already tried the Ubuntu bug-tracker (see below) with no success.

Thank you,


Am 11.05.20 um 10:18 schrieb Arno:

My laptop (core m5-6y54) starts flickering after returning from Suspend (to RAM) or other commands touching the video driver (xrandr, powertop --calibrate, ...)

From kernel (tested with up to 5.7) I get the message:

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

I added a bug with more details here:


but guys from Ubuntu seems not able to help (as it is an upstream bug) !?

This happend not in older kernels, but these have the problem not to go in power save states. So I think the fix of that


causes this regression.

Hope someone can help. For a  laptop it is better to have both - standby and power saving. Thank you.



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