A workaround has been found, and confirmed to work. After booting into the OS, running this command in the terminal activates the back light.
$ sudo setpci -s 00:02.0 F4.B=0
Unfortunately this command must be run after every boot. When resuming from suspend, the back light does not return.
A workaround has been found, and confirmed to work. After booting into the OS, running this command in the terminal activates the back light.
$ sudo setpci -s 00:02.0 F4.B=0
Unfortunately this command must be run after every boot. When resuming from suspend, the back light does not return.