On Tue, Jan 14, 2014 at 1:49 PM, Aaron Lu <aaron.lu@xxxxxxxxx> wrote: > On 01/11/2014 11:22 AM, Bradley Baetz wrote: >> Hi, >> >> I have a Dell Vostro 3560 laptop, with hybrid graphics (intel + radeon). >> >> This exposes 3 backlight devices - acpi_video0, acpi_video1, and >> intel_backlight. Only the intel_backlight/brightness file actually >> changes the backlight. Is this a kernel bug, or should userspace >> 'know' which backlight file to use based on which graphics device is >> active? XFCE picks the first one it finds (acpi_video0), which doesn't >> work. > > Solving it from userspace: > You can specify which backlight interface to use by editing /etc/xorg.conf: > Section "Device" > Identifier "Intel Graphics" > Driver "intel" > Option "AccelMethod" "sna" > Option "Backlight" "intel_backlight" # use your backlight that works here > Driver "intel" > BusID "PCI:0:2:0" > EndSection > > See https://wiki.archlinux.org/index.php/Backlight > > solving it from kernel space: > Since the firmware claims support of win8, you can forget the > acpi_backlight=vendor cmdline option and just use video.use_native_backlight=1. Thanks, that commandline option works on 3.13-rc. Bradley -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
