Auto backlight management?
jordan.crouse at amd.com
Fri Apr 25 01:41:46 EDT 2008
On 24/04/08 22:10 -0700, david at lang.hm wrote:
> On Fri, 25 Apr 2008, Eben Eliason wrote:
> > On Thu, Apr 24, 2008 at 10:43 PM, John Watlington <wad at laptop.org> wrote:
> >> Bert misread the spec. When the backlight is switched off, the screen
> >> automatically switches to B&W mode. Why would you want to take
> >> that out of the control of the user ?
> > I'm working on mockups for a "screen device" (in the Frame) which will
> > include a brightness slider and an independent checkbox for color/b&w
> > mode, so that these can be managed directly by the user at their
> > discretion. It's clear to me that it would be quite useful to have a
> > bright backlight AND black & white mode for reading a book at night,
> > for instance, and this isn't possible in the current UI.
> I used to think the same thing, but I learned it's not possible in the
> current hardware.
> this is the one drawback to the fantasic screen, any light from the
> backlight that gets through is colored by the screen. it can be made to
> appear white by allowing all three colors through, but it's still colored.
> this means that you can't get high resolution mode with the backlight on.
No part of that is true. The behavior you describe is a myth,
kept alive by people who misinterpet the display specification.
You can turn on monochrome mode at any time. Try it yourself:
echo "1" > /sys/devices/platform/dcon/output
Boom - there you go. Monochrome for your pleasure.
Systems Software Development Engineer
Advanced Micro Devices, Inc.
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