I think Rodrigo was asking for someone to run those commands on real hardware. If you run in a VM it is unlikely that a backlight will be present - afaik VirtualBox/QEMU do not emulate a backlight. It would be poor isolation if a guest VM going to LCD standby took down the host LCD.
I think Rodrigo was asking for someone to run those commands on real hardware. If you run in a VM it is unlikely that a backlight will be present - afaik VirtualBox/QEMU do not emulate a backlight. It would be poor isolation if a guest VM going to LCD standby took down the host LCD.