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SubjectRe: [Regression] Laptop screen dark when lid closed and reopened.with 3.1
From: Keith Packard <>

To: Alex Davis <>; "" <>
Sent: Saturday, September 24, 2011 10:48 AM
Subject: Re: [Regression] Laptop screen dark when lid closed and reopened.with 3.1

>If you can, please send along a kernel log with drm.debug=5 and the
>output of intel_reg_dumper run when the screen is working and when it is
>black -- you'll need to use ssh from another computer to capture the
>intel_reg_dumper can be found at:
>        git://
>I suspect you're hitting some of the backlight changes. Hard to believe
>that something as simple as a light could be so complicated...

Thanks for the info, will do this early next week.

One good thing about the 3.1 kernels is that I now have the /sys/class/backlight/intel_backlight directory
in addition to /sys/class/backlight/dell_backlight. With intel_backlight, I can control the LCD brightness;
dell_backlight never worked, neither in 3.0 or 3.1.

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