[Intel-gfx] Screen goes blank @30 seconds into boot

jheaton5 at comcast.net jheaton5 at comcast.net
Wed Feb 22 22:20:05 CET 2012

----- 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, 

[1] http://bugs.debian.org/660394 
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