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. Regards, Andr�