perfect! I did a reboot, and gave it at the kernel prompt a "boot -c", to enterinto UKC. It would allow to "find acpivideo", which I disabled. Booting OpenBSD66 into xenodem will go with full brightness, but once in a terminal window I can do:
$ doas wsconsctl display.brightness=6 display.brightness -> 5.97% $ doas wsconsctl display.brightness=27 display.brightness -> 26.89% $ doas wsconsctl display.brightness=75 display.brightness -> 74.91% and the screen now adapts brightness as desired. thx so much, Volker On Sun, Feb 09, 2020 at 01:44:54PM +0100, Caspar Schutijser wrote: > > Your email triggered me to look into this because I have a somewhat > comparable laptop on my desk (dmesg below) and it suffers from the same > problem. In the archives, I found a couple of things that could help: > > 1. Disable acpivideo(4) and/or acpivout(4) using UKC [1] [2]. > > 2. Use jcs' intel_backlight_fbsd [3], see > https://github.com/jcs/intel_backlight_fbsd > > Both approaches allow me to control the brightness of the screen. FWIW, > output of Linux running on this machine: > $ ls /sys/class/backlight/ > intel_backlight > > Best regards, > Caspar Schutijser > > > [1] https://marc.info/?l=openbsd-bugs&m=152699304722212&w=2 > [2] https://marc.info/?l=openbsd-bugs&m=142787936328279&w=2 > [3] https://marc.info/?l=openbsd-bugs&m=149583867702445&w=2 > > >
