----- Original Message -----
From: "Jonathan Nieder" <jrnieder at gmail.com>
To: "Keith Packard" <keithp at keithp.com>
Cc: "Joel Heaton" <jheaton5 at comcast.net>, intel-gfx at lists.freedesktop.org
Sent: Wednesday, February 22, 2012 6:03:08 AM
Subject: Re: Screen goes blank @30 seconds into boot
(resending after subscription to appease list spam filter.
Keith and Joel, sorry for the duplicate message)
Hi intel-gfx list,
Keith Packard wrote:
> On Thu, 26 Jan 2012 06:54:48 -0500, Joel Heaton <jheaton5 at comcast.net> wrote:
>> System: Dell Inspiron One
>> Chipset: intel H61 Express
>> CPU: Intel Pentium Dual Core Intel Core i3/i5i7 (this machine is
>> probably an i3
>> Video: Intel HD/HD 2000/HD 3000
[...]
>> When booting the screen goes blank about 80% through the boot cycle.
>> The system is still running, I can log in blind and execute reboot
>> command.
>
> Is the monitor backlight on or off? If off, can you try finding a bright
> light and shining it on the monitor to see if the image is present, but
> the backlight simply disabled?
Interesting question. Joel?
Sorry about not answering this question. I do not see the image on the screen with a bright light.
>> I ssh into the system from another computer.
>> kern.log reports "Firmware Bug: ACPI: No _BQC method, cannot determine
>> initial brightness"
>
> The last bug we saw with this was a system that did leave the monitor
> off. Here's a patch that fixed that machine:
>
> Keith Packard <keithp at keithp.com> (December 31) (lkml me patch sent)
> Subject: [PATCH] acpi/video: Don't restore backlight to 0 at boot time
No change, alas, when Joel tried this patch[1]:
| I made the change by editing drivers/acpi/video.c but the bug is
| recreated.
Cherry-picking commit 7885d2052bd ("drm/i915: mask transcoder select
bits before setting them on LVDS") did not help either. More details
including some kernel logs and an acpidump at [1].
Thanks and hope that helps,
Jonathan
[1] http://bugs.debian.org/660394
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