I sent this to the lkml but i got no reply. maybe im missing something obvious? my report lacks information? or this list is the apropiate place to send ;)
---------- Forwarded message ---------- From: Tomas M tmezzadra@gmail.com Date: Thu, Nov 8, 2012 at 5:51 PM Subject: [i915] linux-3.7-rc1 onwards, backlight will not turn on To: linux-kernel@vger.kernel.org
Hello. First of all, ive 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. the backlight is turned on.
attaching a dmesg from such a boot (linux-3.7-rc4). the dirty part is due to depmod 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