linux-kernel - Regression in i915 intel_panel_setup

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Message-ID: <542F0546.6040604@dragonslave.de>
Date:	Fri, 03 Oct 2014 22:21:26 +0200
From:	Daniel Exner <dex@...gonslave.de>
To:	linux-kernel@...r.kernel.org
CC:	Daniel Exner <dex@...gonslave.de>
Subject: Regression in i915 intel_panel_setup_backligh

Hi,

please keep me CC as I am currently not subscribed to the LKML.

I recently tested 3.17-rc7 and found my Samsung AtivBook 7 unable to
enable inteldrmfb (see attached output of the crash).

I managed to bisect it to:

commit 4dac3edfe68e5e1b3c2216b84ba160572420fa40
Merge: 4877776 e05444b
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue Jul 29 20:49:36 2014 +0200

    Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next

    Pull in drm-next with Dave's DP MST support so that I can merge some
    conflicting patches which also touch the driver load sequencing around
    interrupt handling.

    Conflicts:
        drivers/gpu/drm/i915/intel_display.c
        drivers/gpu/drm/i915/intel_dp.c

    Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>

git bisect log:
git bisect start 'v3.17.0-rc4' 'v3.15' 'drivers/gpu/drm/i915/intel_dp.c'
# bad: [2ce7598c9a453e0acd0e07be7be3f5eb39608ebd] Linux 3.17-rc4
git bisect bad 2ce7598c9a453e0acd0e07be7be3f5eb39608ebd
# good: [1860e379875dfe7271c649058aeddffe5afd9d0d] Linux 3.15
git bisect good 1860e379875dfe7271c649058aeddffe5afd9d0d
# good: [7c8f8a7007cf0069488e0b4e3db5f89d715f297e] drm/i915: Force PSR
exit by inactivating it.
git bisect good 7c8f8a7007cf0069488e0b4e3db5f89d715f297e
# good: [9ca153017e00550dbeda2718cfd69ca37de9c523] drm/i915: Fix up PSR
frontbuffer tracking
git bisect good 9ca153017e00550dbeda2718cfd69ca37de9c523
# bad: [5d42f82a9b8c5168d75cf59307cd271feca94464] Merge tag 'v3.16' into
drm-next
git bisect bad 5d42f82a9b8c5168d75cf59307cd271feca94464
# good: [0e32b39ceed665bfa4a77a4bc307b6652b991632] drm/i915: add DP 1.2
MST support (v0.7)
git bisect good 0e32b39ceed665bfa4a77a4bc307b6652b991632
# bad: [4dac3edfe68e5e1b3c2216b84ba160572420fa40] Merge remote-tracking
branch 'airlied/drm-next' into drm-intel-next
git bisect bad 4dac3edfe68e5e1b3c2216b84ba160572420fa40
# good: [eeefa889cddb8d7e4ee6ce0212e685dd624d66a1] drm/i915: Remove
redundant HAS_PSR checks
git bisect good eeefa889cddb8d7e4ee6ce0212e685dd624d66a1
# good: [4651fb23f6f1d86700b07a27ad7f137d28492342] drm/i915: remove
useless runtime PM get calls
git bisect good 4651fb23f6f1d86700b07a27ad7f137d28492342
# first bad commit: [4dac3edfe68e5e1b3c2216b84ba160572420fa40] Merge
remote-tracking branch 'airlied/drm-next' into drm-intel-next


Any thoughts on that?

Greetings
Daniel
-- 
Daniel Exner
Public-Key: https://www.dragonslave.de/pub_key.asc

View attachment "intelcrash.txt" of type "text/plain" (8850 bytes)