Bug 99344 - [KBL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
Summary: [KBL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
Depends on:
Reported: 2017-01-10 12:55 UTC by Andrey
Modified: 2019-06-15 23:10 UTC (History)
2 users (show)

See Also:
i915 platform: KBL
i915 features:

dmesg (282.93 KB, text/plain)
2017-01-10 12:55 UTC, Andrey
no flags Details
dmesg drm-tip (251.04 KB, text/plain)
2017-01-20 05:23 UTC, Nick Desaulniers
no flags Details
an earlier dmesg with more info (166.51 KB, text/plain)
2017-01-20 05:33 UTC, Nick Desaulniers
no flags Details

Description Andrey 2017-01-10 12:55:47 UTC
Created attachment 128853 [details]

This occasionally happens on resume, after display has been suspended.

I.e. I can trigger this via following commands:
     xset dpms force suspend && xset dpms force on

Sometimes screen remains black after that.
There are two errors in dmesg:
[  850.328129] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change
[  850.533486] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun

Sometimes I see only the first error, but in that case display works, it doesn't remain black. So this might be a two separate issues, I'm going to open another bug for the first error.

dmesg with drm.debug=1e attached.

Kernel version - 4.9.2
Hardware - Dell XPS 13 9360
Comment 1 Nick Desaulniers 2017-01-20 05:23:17 UTC
I see this as well even when booting a drm-tip tree kernel.  2016 Razer Blade Stealth (Kaby Lake) Ubuntu 16.10.
Comment 2 Nick Desaulniers 2017-01-20 05:23:54 UTC
Created attachment 129056 [details]
dmesg drm-tip
Comment 3 Nick Desaulniers 2017-01-20 05:33:28 UTC
Created attachment 129057 [details]
an earlier dmesg with more info
Comment 4 Nick Desaulniers 2017-01-22 21:20:06 UTC
If I add the kernel command line `i915.enable_rc6=0` this works around the issue.  Note: this should still be fixed, a release candidate should not have this kind of bug.
Comment 6 Nick Desaulniers 2017-01-23 07:07:33 UTC
Oh, looks like rc6 stands for "Render C state 6": http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/i915_params.c#L82
Comment 7 Nick Desaulniers 2017-02-11 08:34:30 UTC
I just booted a drm-tip kernel with the lastest commit of:

commit 4dbd7c0fbb78579ff491ef1184f78087055c5aa5
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Feb 10 21:45:49 2017 +0000
drm-tip: 2017y-02m-10d-21h-45m-14s UTC integration manifest

and removed the kernel command line parameter (i915.enable_rc6=0) and no longer seeing flicker at native resolutions.  I assume that tree will be pulled from for the 4.10 kernel.
Comment 8 Jari Tahvanainen 2017-04-11 10:16:26 UTC
Hello Andrey, please note the comment 7 and retest with the latest kernel (preferable drm-tip from git://anongit.freedesktop.org/git/drm-tip). If problem still persist, please mark status REOPENED, otherwise RESOLVED.
Nick - can you also check this with the latest drm-tip?
Comment 9 Jani Saarinen 2017-05-22 10:02:06 UTC
Reporters, please comment if issue is solved or not.
Comment 10 Andrey 2017-05-22 11:01:16 UTC
Sory for delayed response.
The issue has been fixed for me.
Comment 11 Jani Saarinen 2017-05-24 06:21:28 UTC
Thanks for the feedback. Closing.
Comment 12 Nick Desaulniers 2019-06-14 19:00:16 UTC
Sorry to reopen, but I'm still seeing this issue.  What can I provide to help debug it?
Comment 13 Jani Saarinen 2019-06-14 19:04:57 UTC
Hi, Can you open new bnug not opening really old bug. Have you tested with latest drm-tip that is now 5.2rc4?
Comment 14 Nick Desaulniers 2019-06-15 23:10:43 UTC
Sure. Let's track in https://bugs.freedesktop.org/show_bug.cgi?id=108860.  Note that there seems to be many bugs related to `drm:intel_cpu_fifo_underrun_irq_handler`.  It might be good for someone to triage/dedup and better understand how pervasive the issue is.  I'm doing build right now of drm-tip; will report in https://bugs.freedesktop.org/show_bug.cgi?id=108860.

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