Bug 99929

Summary:

[i915] Black/gray screen with kernel 4.9.3

Product:

DRI

Reporter:

Anders Blomdell <anders.blomdell>

Component:

DRM/Intel

Assignee:

Ville Syrjala <ville.syrjala>

Status:

CLOSED FIXED

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

critical

Priority:

highest

CC:

anders.blomdell, intel-gfx-bugs

Version:

XOrg git

Keywords:

bisected, regression

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

PatchSubmitted

i915 platform:

SKL

i915 features:

display/watermark

Attachments:

Description	Flags
dmesg of failed graphics	none
dmesg of successful graphics	none
opregion of failed graphics	none
opregion of successful graphics	none

Description Anders Blomdell 2017-02-23 18:55:43 UTC

For further info see https://bugzilla.redhat.com/show_bug.cgi?id=1398362


When booting 4.9.3 kernel , gdm starts with a black/gray screen. Some bisecting gave the results below.

I found that 4.9.3 kernel (from linux-stable) after reverting commit 0ce140d45a8398b501934ac289aef0eb7f47c596, the problem is fixed. Relevant output from the logs (4.9.3-1-g17a6527 is the one with the reverted patch):


Command line: BOOT_IMAGE=/vmlinuz-4.9.3-1-g17a6527+ root=/dev/mapper/vg0-root ro rd.auto=1

Command line: BOOT_IMAGE=/vmlinuz-4.9.3 root=/dev/mapper/vg0-root ro rd.auto=1
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Comment 1 Jani Nikula 2017-02-27 13:00:27 UTC

(In reply to Anders Blomdell from comment #0)
> I found that 4.9.3 kernel (from linux-stable) after reverting commit
> 0ce140d45a8398b501934ac289aef0eb7f47c596, the problem is fixed. Relevant
> output from the logs (4.9.3-1-g17a6527 is the one with the reverted patch):

The bad commit is

commit 0ce140d45a8398b501934ac289aef0eb7f47c596
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Tue Oct 11 20:52:47 2016 +0300

    drm/i915: Clean up DDI DDC/AUX CH sanitation

Comment 2 Ville Syrjala 2017-04-12 18:30:16 UTC

Please attach full dmesg with drm.debug=0xe for both the good and bad kernels. Also a copy of /sys/kernel/debug/dri/0/i915_opregion would be nice.

Comment 3 Jani Saarinen 2017-05-12 07:43:36 UTC

Hi, any comments from reporter, we are closing if no feedback received in a month.

Comment 4 Anders Blomdell 2017-05-12 11:28:00 UTC

Created attachment 131331 [details]
dmesg of failed graphics

Comment 5 Anders Blomdell 2017-05-12 11:29:06 UTC

Created attachment 131332 [details]
dmesg of successful graphics

Comment 6 Anders Blomdell 2017-05-12 11:31:36 UTC

Created attachment 131333 [details]
opregion of failed graphics

Comment 7 Anders Blomdell 2017-05-12 11:32:29 UTC

Created attachment 131334 [details]
opregion of successful graphics

Comment 8 Anders Blomdell 2017-05-12 11:35:01 UTC

Failed version is 4.8.15
Successful version is 4.9.10

Comment 9 Ville Syrjala 2017-05-12 12:16:31 UTC

I suspect this has been fixed by commit bb1d132935c2 ("drm/i915/vbt: split out defaults that are set when there is no VBT")

Can you confirm?

Comment 10 Anders Blomdell 2017-05-12 12:35:27 UTC

(In reply to Ville Syrjala from comment #9)
> I suspect this has been fixed by commit bb1d132935c2 ("drm/i915/vbt: split
> out defaults that are set when there is no VBT")
> 
> Can you confirm?

Which git-repo?

Comment 11 Ville Syrjala 2017-05-12 12:53:43 UTC

(In reply to Anders Blomdell from comment #10)
> (In reply to Ville Syrjala from comment #9)
> > I suspect this has been fixed by commit bb1d132935c2 ("drm/i915/vbt: split
> > out defaults that are set when there is no VBT")
> > 
> > Can you confirm?
> 
> Which git-repo?

It should be in Linus's tree by now.

Comment 12 Jani Saarinen 2017-05-22 10:04:42 UTC

Reporter, ca you report back?

Comment 13 Anders Blomdell 2017-05-22 14:33:43 UTC

commit bb1d132935c2 works!

Thanks!

Comment 14 Ricardo 2017-05-23 19:44:31 UTC

confirmed as resolved... need to test again once patch is incorporated

Comment 15 Jari Tahvanainen 2017-05-24 11:16:40 UTC

Closing since code is on drm-tip.

commit bb1d132935c2f87cd261eb559759fe49d5e5dc43
Author:     Jani Nikula <jani.nikula@intel.com>
AuthorDate: Fri Mar 10 15:27:58 2017 +0200
Commit:     Jani Nikula <jani.nikula@intel.com>
CommitDate: Tue Mar 14 10:49:13 2017 +0200
    drm/i915/vbt: split out defaults that are set when there is no VBT

AND

commit 9301397a63b3bf1090dffe846c6f1c8efa032236
Author:     Manasi Navare <manasi.d.navare@intel.com>
AuthorDate: Thu Apr 6 16:44:19 2017 +0300
Commit:     Jani Nikula <jani.nikula@intel.com>
CommitDate: Thu Apr 13 21:57:37 2017 +0300
    drm/i915: Implement Link Rate fallback on Link training failure

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