Re: [linux-pm] Re: [PATCH, RFC] [1/3] Generic in-kernel AC status

On Čt 09-02-06 09:53:44, Gabor Gombas wrote:
On Wed, Feb 08, 2006 at 05:08:58PM +0000, Matthew Garrett wrote:

The backlight interface only supports exporting and setting the current
brightness. For various bits of hardware, the AC and DC brightnesses are
stored separately. Drivers would need to know which brightness value to
export to userspace. I have an HP backlight driver here which would
benefit from this, and I'm looking at the same issue for a Panasonic
one.

I don't know the backlight interface but extending it to export all
available brightness values would seem more logical to me.

If I'd had a laptop I'd hate if I could only set the DC brightness if I
plug out the AC power.

Still "set current brightness" operation makes a lot of sense.
Pavel
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