I've installed Ubuntu Studio Xenial 16.04.1 on my PC with i7 6800k and GTX 970, connected to my iMac 11,3 (which I'm using as a monitor) via DisplayPort.I'm not able to change the backlight levels of my display; in fact, my /sys/class/backlight is completely empty.
When I run
lshw -c video, I get:
*-display description: VGA compatible controller product: GM204 [GeForce GTX 970] vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:03:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nvidia latency=0 resources: irq:53 memory:fa000000-faffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:fb000000-fb07ffff
If I open Software & Updates and go to the Additional Drivers tab, under the
NVIDIA Corporation:GM204[GeForce GTX 970], is says I'm
Using NVIDIA binary driver-version 367.57 from nvidia-367 (proprietary, tested).
For the device
Unknown: Unknown, it says I'm
Using Processor microcode firmware for Intel CPUs from intel-microcode(proprietary) instead of
Do not use the device.
In case it helps, I've located the
max_brightness files in another directory:
How can I setup my system so that I can change my iMac screen brightness using my apple keyboard shortcuts just as I can volume?