linux-kernel - Re: Linux 3.8-rc2

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Message-ID: <CAJ4QQ2_qLd6kC0iz2OqqrGGJY0QyghO=4zo38r9qq5afR2ZhZw@mail.gmail.com>
Date:	Thu, 3 Jan 2013 23:06:00 +0100
From:	Peter Ujfalusi <peter.ujfalusi@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Rodrigo Vivi <rodrigo.vivi@...il.com>,
	stable <stable@...r.kernel.org>
Subject: Re: Linux 3.8-rc2

Hi Linus,

On Thu, Jan 3, 2013 at 10:32 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Jan 3, 2013 at 1:09 PM, Alexey Zaytsev <alexey.zaytsev@...il.com> wrote:
>>
>> i915 got broken on my machine (Lenovo ThinkPad SL500) by this -rc. The screen
>> goes blank after loading the module. I've bisected the problem to
>> b0a2658acb5bf9ca86b4aab011b7106de3af0add "drm/i915: don't disable
>> disconnected outputs".
>
> Hmm. Daniel - should I just revert it, or do you have a patch to
> possibly fix the divide-by-zero error in g4x_compute_wm0() (which may
> involve not getting that deep in the call chain to begin with or
> whatever)? Maybe that fixes the blank screen too without a revert..

I have reported the issue [1] which resulted the b0a2658 patch. My laptop
boots fine with 3.8-rc2+ but if I revert b0a2658 I have NULL pointer crash as
in bug report.

Alexey: to aim Daniel to figure out what is going on can you boot the kernel
with drm.debug=0x0e cmd line parameter?

[1] https://bugs.freedesktop.org/show_bug.cgi?id=58396

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