[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Martin Peres  changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|NEW |RESOLVED

--- Comment #6 from Martin Peres  ---
Hi,

Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated
to http://gitlab.freedesktop.org.

To avoid migrating out of date bugs, I am now closing all the bugs that did not
see any activity in the past year. If the issue is still happening, please
create a new bug in the relevant project at https://gitlab.freedesktop.org/drm
(use misc by default).

Sorry about the noise!

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

--- Comment #5 from Lionel Le Folgoc  ---
Created attachment 134463
  --> https://bugs.freedesktop.org/attachment.cgi?id=134463=edit
(for reference only, first attempt at bisecting in drm/i915, it does not show
the real first bad commit, see
https://bugs.freedesktop.org/attachment.cgi?id=134458 instead)

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Lionel Le Folgoc  changed:

   What|Removed |Added

 Attachment #134462|text/x-log  |text/plain
  mime type||

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Lionel Le Folgoc  changed:

   What|Removed |Added

 Attachment #134461|text/x-log  |text/plain
  mime type||

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Lionel Le Folgoc  changed:

   What|Removed |Added

 Attachment #134460|text/x-log  |text/plain
  mime type||

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Lionel Le Folgoc  changed:

   What|Removed |Added

 Attachment #134458|text/x-log  |text/plain
  mime type||

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Lionel Le Folgoc  changed:

   What|Removed |Added

 Attachment #134459|text/x-log  |text/plain
  mime type||

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

--- Comment #4 from Lionel Le Folgoc  ---
Created attachment 134462
  --> https://bugs.freedesktop.org/attachment.cgi?id=134462=edit
xrandr without flickering

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

--- Comment #3 from Lionel Le Folgoc  ---
Created attachment 134461
  --> https://bugs.freedesktop.org/attachment.cgi?id=134461=edit
dmesg without flickering

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

--- Comment #2 from Lionel Le Folgoc  ---
Created attachment 134460
  --> https://bugs.freedesktop.org/attachment.cgi?id=134460=edit
xrandr with flickering

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

Bug ID: 102972
   Summary: Flickering since 4.11
   Product: DRI
   Version: XOrg git
  Hardware: All
OS: Linux (All)
Status: NEW
  Severity: normal
  Priority: medium
 Component: DRM/other
  Assignee: dri-devel@lists.freedesktop.org
  Reporter: lionel-...@lefolgoc.net

Created attachment 134458
  --> https://bugs.freedesktop.org/attachment.cgi?id=134458=edit
bisect log (drm)

Hi,

(I've only Intel hardware available but since git bisect shows the culprit in
drm and not drm/i915, I've filed it against DRM/other, feel free to reassign)

Since 4.11, I've noticed major flickering on some displays I have (reproducible
100%). By flickering I mean the screen is mostly black and every few seconds I
can see a flash with the screen content and it goes black again.
It only occurs with the preferred mode, i.e. when I force a modeline to another
mode in xorg.conf the flickering does not occur.

I've tried all versions up to latest 4.14.0-rc2 and it is still reproducible,
4.10.x were fine. The display driver used (intel or modesetting) does not make
a difference.

I tried on all hardware I have here (NUC gen4 d5420, NUC5i5 and NUC6i5SYB) and
the behavior is the same. I tried miniDP and HDMI, and it does not change
anything.

The captured logs below have been run on a NUC6i5SYB connected with miniDP,
running CentOS 7.3, with the kernel 4.11.8 (from mainline, no ct7 or rhel
patches). The git bisect was also run on this machine.

Git bisect identified fcc8a22cc9053a8d1bbb94833ec103cd5961feef as first bad
commit.
With the log files below, 4.11.8-1 is "original" 4.11.8 kernel (bad), and
4.11.8-2 includes the commit reverted (good).

>From the git bisect log and the fact it can be worked around with another
modeline, I'm not even sure this is a regression in the kernel, as this might
be that the screen is advertising something it cannot support properly...

Thanks.

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[Bug 102972] Flickering since 4.11

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102972

--- Comment #1 from Lionel Le Folgoc  ---
Created attachment 134459
  --> https://bugs.freedesktop.org/attachment.cgi?id=134459=edit
dmesg with flickering

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