Anno domini 2019 Mon, 15 Jul 14:59:21 +0200
 andre_debian@... scripsit:
> On Thursday 11 July 2019 23:35:54 Mike Bird wrote:
> > On Thu July 11 2019 14:28:29 andre_debian@... wrote:
> > > On my laptop computer , the keys F11 and F12,
> > > adjusts the brightness of the screen.
> > > But on Debian-Stretch with trinity, these two keys do nothing.
> 
> > I can't help you with F11 and F12 but if it's a 70% brightness
> > you want you can put "xbacklight -set 70" in a file called
> > ".xsessionrc" in your home directory.
> 
> Hello,
> 
> $ xbacklight -set 70
> "No outputs have backlight property"
> 
> (xbacklight is installed) I'am on Debian Stretch.
> 
> The others solutions proposed don't work.

What hardware are you on? Thinkpads need thinkpad_acpi for this to work ...

> 
> Regards,
> 
> Andr�
> 
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