Another option (using current):
Section "Module"
Load "dri2"
Load "glamoregl"
EndSection
Section "Device"
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
Option "AccelMethod" "glamor"
EndSection
There are some Linux forums where people complain about experiencing
screen brightness issues using intel SNA acceleration. Some of them got
them fixed by setting the "Backlight" option to the correct value as
explained in the intel(4) man page:
Option "Backlight" "string"
Override the probed backlight control interface. Sometimes the
automatically selected backlight interface may not correspond to
the correct, or simply most useful, interface available on the
system. This allows you to override that choice by specifying
the entry under /sys/class/backlight to use.
You won't find /sys/class/backlight in OpenBSD. And setting the value
to "intel_backlight" as explained in some Linux wikis won't work since
in openbsd the interface seems to be wscons:
$ grep backlight /var/log/Xorg.0.log
[ 34783.393] (--) intel(0): found backlight control interface wscons
If after exiting X you run:
$ wsconsctl display.brightness
It'll return a value that doesn't correspond with the actual (very low)
brightness. The wscons stored brightness value isn't reset but right
after you press the Fn+brightness keys. I deduce SNA driver doesn't
pass wscons the brightness control properly. Let's hope some expert
here tell us why. :-)
Walter
