linux-kernel - Re: [regression?] Sometime (often) X come out blank (black screen) on cold boot

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Date:	Tue, 10 Jun 2008 11:06:23 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Romano Giannetti <romanol@...omillas.es>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Justin Madru <jdm64@...ab.com>
Subject: Re: [regression?] Sometime (often) X come out blank (black screen) on cold boot - Intel chipset

On Tuesday, June 10, 2008 5:38 am Romano Giannetti wrote:
> I just opened this: http://bugzilla.kernel.org/show_bug.cgi?id=10892 . I
> think itś a regression, but (read the description) I am not so sure, so
> I checked regression but I have not blocked Rafael's metabug.
>
> Latest working kernel version: 2.6.25
> Earliest failing kernel version: After 2.6.25, exatcly don't know, probably
> 2.6.26-rc3
> Distribution:Ubuntu 8.04 Hardy
> Hardware Environment: toshiba U305 intel-based laptop, see
> http://bugzilla.kernel.org/attachment.cgi?id=16067&action=view
> Software Environment:xserver-xorg-video-intel  2:2.2.1-1ubuntu12, see also
> http://bugzilla.kernel.org/attachment.cgi?id=16066&action=view
> Problem Description:
>
> Sometime, on cold boot (after the laptop has been shut off), when the
> screen switch from the Ubuntu startup to gdm, the screen goes blank.
> Forever. Rebooting (warm) with the same kernel cures it, sometime. If I
> reboot 2.6.25 it cures it everytime.
>
> Otherwise, the system seems to be working.
>
> It was difficult to see because I almost never do a cold boot, the laptop
> is either sleeping (s2ram) or on, or (warm) rebooted when I test a new
> kernel.
>
> Helps / tricks to gather more data when it happens are welcome.

This sounds like a DUP; I remember Justin Madru had a similar issue (with 
Ubuntu & gdm even iirc).

Is there any way you could run the latest git bits of the Intel X driver?  
I've added some debugging that could catch at least one of the common reasons 
why the display would blank like that...

Thanks,
Jesse
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