In that process I realized I did not need xf86-video-intel in general, so I removed that.
I spent much of this past weekend troubleshooting to no avail. I tried using the linux-lts kernel as well as linux-zen to no avail.Īnyway, I'm running out of ideas. I've been poking around in there to see how they got it to work (kernel params, modprobe settings, using acpid, etc.) but nothing seems to work in Arch. The brightness adjustment works out of the box with Ubuntu, including the function keys. Also, it does not seem matter to Ubuntu because: Some have suggested that Dell's Content Adaptive Brightness Control is interfering I have disabled that in the firmware settings (though I did not apply the patch Dell supplies to do this it requires Windows).
to function but that's a software hack (and I want to continue using the modesetting driver if I can help it). Installing xf86-video-intel will allow xbacklight to find a backlight, but it can't adjust it. These will variously add 'acpi_video0' and 'dell_backlight' to /sys/class/backlight but these also do not adjust the backlight. Both the Backlight and Intel Graphics articles suggest several kernel parameters to address this problem:
