linux-kernel - Re: [Intel-gfx] [Bug 3.15-rc2] [bisected] intel framebuffer broken

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Date:	Tue, 22 Apr 2014 15:59:40 +0200
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	Jani Nikula <jani.nikula@...ux.intel.com>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [Intel-gfx] [Bug 3.15-rc2] [bisected] intel framebuffer broken

On 22.04.2014 13:54, Jani Nikula wrote:
> On Mon, 21 Apr 2014, Knut Petersen <Knut_Petersen@...nline.de> wrote:
>> Booting kernel 3.15-rc2 on an AOpen i915GMm-hfs, I see the framebuffer broken.
>> Only about the upper left quarter of the monitor is used for displaying the boot messages,
>> these (and the cursor) are replicated at the right of that area.
> Is this before or after i915.ko is loaded?
No .ko, it's compiled directly into the kernel.

First bad commit is d978ef14456a38034f6c0e94a794129501f89200
(drm/i915: Wrap the preallocated BIOS framebuffer and preserve for KMS fbcon v12)

Probably there needs to be a v13 ;-)

cu,
  Knut


>
>> Approximately the lower half of the monitor stays black. The output of the xserver
>> is not affected.
> Most likely the fastest way to root cause is to bisect, please do. To
> keep track of all the bugs we have, please file a bug on DRM/Intel at
> [1] and while at it attach dmesg with drm.debug=0xe from the boot.
>
> BR,
> Jani.
>
>
> [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
>
>


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