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

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Message-Id: <1213101501.21041.9.camel@pern>
Date:	Tue, 10 Jun 2008 14:38:21 +0200
From:	Romano Giannetti <romanol@...omillas.es>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [regression?] Sometime (often) X come out blank (black screen) on
	cold boot - Intel chipset


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.

-- 
Sorry for the disclaimer --- ¡I cannot stop it!



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