Cannot set the brightness of the one of the two LCD through thr Power Manager Plugin
I run xubuntu20.04 on an aarch64 board with an RK3399 CPU. The display LCD is an eDP and a DSI. I found that when I drag the brightness bar, only the brightness of DSI changed, while the brightness of the eDP remain unchanged. The brightness of these 2 LCDs is controlled by 2 separate PWM sources. The eDP is controlled by pwm0 and the DSI is controlled by pwm1.
I attempt to control the brightness of these two LCDs by writing the /sys/class/backlight/backlight and the /sys/class/backlight/backlight2 node separately. Then I found that if I close the DSI display in the kernel, the brightness of the eDP can be controlled by dragging the brightness bar.
I found that the Power Manager Plugin controls the brightness through xfpm_brightness_helper
, and xfpm_brightness_helper
don't have an option to control 2 brightness. I wonder how to handle the brightness of 2 LCDs through XFCE