I'm also getting this problem on my Compaq Presario CQ60. Fn+F7/Fn+F8 don't work to set brightness (though other Fn keycodes generally work), and in fact I can't seem to find anything to set any value of brightness at all, and the computer seems to be stuck on the setting of "blindingly bright." /sys/class/backlight is empty, and the Xorg log doesn't mention "video" or "light" at all (other than in reporting the "acpi_backlight" kernel setting I tried; it didn't work). I'm using Ubuntu MATE 16.04. I'm... not sure how to post my specs, so I'm attaching a HardInfo report in case it helps :) Let me know if you need any more information, I'd love to see this bug fixed! (My eyes will thank you!)
I'm also getting this problem on my Compaq Presario CQ60. Fn+F7/Fn+F8 don't work to set brightness (though other Fn keycodes generally work), and in fact I can't seem to find anything to set any value of brightness at all, and the computer seems to be stuck on the setting of "blindingly bright." /sys/class/ backlight is empty, and the Xorg log doesn't mention "video" or "light" at all (other than in reporting the "acpi_backlight" kernel setting I tried; it didn't work). I'm using Ubuntu MATE 16.04. I'm... not sure how to post my specs, so I'm attaching a HardInfo report in case it helps :) Let me know if you need any more information, I'd love to see this bug fixed! (My eyes will thank you!)