On Wed, May 17, 2017 at 11:26 AM, Lars Noodén <lars.nooden@???> wrote:
> On 05/17/2017 06:08 PM, Rob Owens wrote:
> > On Wed, May 17, 2017 at 8:48 AM, Lars Noodén <lars.nooden@???>
> wrote:
> >
> >> On 05/04/2017 03:42 PM, Lars Noodén wrote:
> >>> I'm having trouble adjusting the backlight on my LCD screen in RC 1
> with
> >>> XFCE4. No matter what I've tried so far, it stays where it is. With
> >>> Ubuntu 16.04, things are pre-configured and it is just a matter of
> >>> pressing the right function buttons. However, with Devuan Jessie RC 1
> >>> the right commands are hard to figure out.
> >>>
> >>> Here is what I've tried so far to change the backlight intensity. None
> >>> have any effect:
> >>>
> >>> $ xrandr --output default --brightness 0
> >>> xrandr: Gamma size is 0.
> >>
> >
> > I did this just yesterday on a laptop running Funtoo with Fluxbox, where
> > the built-in function keys for dimming did not work. But I specified a
> > decimal, like this:
> >
> > xrandr --output default --brightness .7
> >
> > That worked for me. Maybe the problem is that you specified zero for the
> > brightness.
>
> Thanks for the reply. It seems that I cannot get anywhere with xrandr
> on my system:
>
> $ xrandr --output default --brightness .7
> xrandr: Gamma size is 0.
> $ xrandr --output default --brightness .1
> xrandr: Gamma size is 0.
> $ xrandr --output default --brightness .9
> xrandr: Gamma size is 0.
> $ xrandr --output default --brightness 1.9
> xrandr: Gamma size is 0.
> $ xrandr --output default --brightness 2
> xrandr: Gamma size is 0.
> $ xrandr --current
> xrandr: Failed to get size of gamma for output default
> Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
> default connected 1920x1080+0+0 0mm x 0mm
> 1920x1080 77.00*
>
> Are there any preparations that need to be made first?
>
I didn't need to do anything except run that command, making sure to
specify the correct video device. I ran 'xrandr' with no arguments to get
a list of the devices on my laptop. I believe one of them said "connected"
after it, so that's the one I used.
Again, this was on a Funtoo system. Unfortunately I do not have a Devuan
system available to test right now.
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Re: [DNG] Adjusting LCD backlight i…
