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

    To: Alex Davis <alex14641@yahoo.com>; "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
    Cc:
    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
    >latter.
    >
    >intel_reg_dumper can be found at:
    >
    >        git://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools
    >
    >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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