linux-kernel - [i915] linux-3.7-rc1 onwards, backlight will not turn on

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Message-ID: <CAFCWdWfe_p3pe8kKc7cikqkrxyFtn2FtFeXT_SzdgKE-wTB3hw@mail.gmail.com>
Date:	Mon, 12 Nov 2012 09:20:51 -0300
From:	Tomas M <tmezzadra@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [i915] linux-3.7-rc1 onwards, backlight will not turn on

Hello.
First of all, i've been trying to bisect this, but from 3.6.0 to 3.7-rc1 the
kernel has behaved really bad so i cannot test without hitting other more
serious bugs (already fixed).

the issue as follows:

device boots ok up to when the kernel sets the display mode. then the screen
goes dark, and there is no way to restore it. suspend-resume cycle will fix
it.

attaching a dmesg from such a boot (linux-3.7-rc4). the dirty part is due to
depmode sed i use in my build script. i have not modified the kernel in any
way, nor inserted any binary blobs.

if you need any further debugging info , please say so, im unaware on how to
hunt this.
please CC me since im not subscribed.

thanks in advance

Tomas Mezzadra

View attachment "dmesg-3.7-rc4.txt" of type "text/plain" (48774 bytes)