On Wed, May 17, 2017 at 11:26 AM, Lars Noodén <lars.noo...@gmail.com> wrote:
> On 05/17/2017 06:08 PM, Rob Owens wrote: > > On Wed, May 17, 2017 at 8:48 AM, Lars Noodén <lars.noo...@gmail.com> > 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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