linux-kernel - Re: [REGRESSION] v3.12-rc1: i915_driver

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Date:	Sun, 8 Sep 2013 01:22:59 +0200
From:	Tom Gundersen <teg@...m.no>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [REGRESSION] v3.12-rc1: i915_driver_load oopses when sysfb enabled

Hi David,

On Sat, Sep 7, 2013 at 11:57 PM, Tom Gundersen <teg@...m.no> wrote:
> On Sat, Sep 7, 2013 at 4:30 PM, David Herrmann <dh.herrmann@...il.com> wrote:
>> Attached are two patches. The first one should fix this issue, the
>> second one is the rebased ioremap_wc() patch from the other thread.
>>
>> Does this fix the issue (and the speed-problems)?
>
> Sadly, no. I added a few printk's to verify that the function you
> added is called (it is), but still the same oops.

A few more datapoints:

Triggers:
X86_SYSFB=y and FB_SIMPLE=n (so no fbdev until i915 is loaded)
X86_SYSFB=y and FB_SIMPLE=y

Does not trigger:
X86_SYSFB=y, FB_EFI=yes, and without the overflow fix (i.e., so we
fall back to efifb)
X86_SYSFB=n and FB_EFI=y
X86_SYSFB=n and FB_EFI=n (so no fbdev until i915 is loaded)

Does this make any sense?

Cheers,

Tom
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