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    SubjectRe: [PATCH] [RESEND] Add Dell laptop backlight brightness display
    On Tue, Feb 07, 2006 at 01:06:45PM +0000, Richard Purdie wrote:

    > This is total abuse of the backlight class. The idea is that
    > cat /sys/class/backlight/ccc/brightness returns the *current* backlight
    > brightness. On AC power it should return the AC brightness value and on
    > DC power return the DC value.

    Unfortunately, the hardware doesn't seem to give us that option. There's
    no obvious way of determining whether we're on AC or DC from the kernel
    without doing very nasty things with ACPI and APM (userspace can work it
    out fairly easily).

    Would you be open to adding generic support for displaying separate AC
    and DC brightnesses? Making it driver specific leaves the potential for
    inconsistencies.

    --
    Matthew Garrett | mjg59@srcf.ucam.org
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