Arch Linux

clayc_989

Member

Registered: 2017-06-13

Posts: 6

Backlight Control Identification

I'm assuming this belongs here as my other thread got moved...

In my polybar config I have the following module

[module/backlight]
type = internal/backlight
card = intel_backlight
format = <ramp> <label>

label-foreground = ${colours.white}

ramp-0 = ?
ramp-1 = ?
ramp-2 = ?
ramp-3 = ?
ramp-4 = ?
ramp-foreground = ${colours.maia}

bar-width = 6
bar-indicator = 
bar-fill = 
bar-fill-font = 3
bar-fill-foreground = ${colours.white}
bar-empty = 
bar-empty-font = 3
bar-empty-foreground = ${colours.grey}

The problem is that I have an nvidia card and of course there is no intel_backlight folder as per this error message

error: Disabling module "backlight" (reason: The file '/sys/class/backlight/intel_backlight/brightness' does not exist)

The only folder in the /sys/class/backlight directory is "gmux_backlight" and the brightness document contains the numbers "614". Even changing the line "card = intel_backlight" to "card = gmux_backlight" produces no error message but doesn't load the module as it should. I didn't expect it to anyways but I at least I can presume that it is looking for a specific file.

The only way I have managed to get my backlight to work with this computer (Macbook Pro '15 model) is to create a service pointing to a script that contains the following.

#!/bin/bash
setpci -v -H1 -s 00:01.00 BRIDGE_CONTROL=0
exit 0

What do I need to point this module to?