I have the new zenbook 15 which comes with a secondary display in the touchpad. Ubuntu recognizes it just fine, as long as I am using Xorg and intel gpu. The issue however is that the brightness on this is not set to max. As ASUS provides drivers for windows I can adjust the backlight through an app. Not so on linux.
Here is what it looks like on Ubuntu:
And on Windows:
This is what xrandr
shows the display as:
HDMI-1 connected 2160x1080+0+1080 right (normal left inverted right x axis y axis) 66mm x 134mm
1080x2160 50.03*+
504x1000 50.03
I try to set the brightness via xrandr --output HDMI-1 --brightness 1.5
(ie. above 1) but this only makes the screen more saturated. It seems it does not control the actual backlight.
Any clues? I tried to mess around with ddcutil, using sudo ddcutil detect to get (note i2c-3 is the screenpad):
Invalid display
I2C bus: /dev/i2c-3
EDID synopsis:
Mfg id: TSB
Model: ScreenXpert-
Serial number: Unspecified
Manufacture year: 2011
EDID version: 1.3
DDC communication failed
Invalid display
I2C bus: /dev/i2c-8
EDID synopsis:
Mfg id: BOE
Model: Unspecified
Serial number: Unspecified
Manufacture year: 2018
EDID version: 1.4
DDC communication failed
I wasn't too sure how to set backlight so I downloaded the GUI for ddccontrol (gddccontrol) and when I tried to change the settings of i2c-3 I see this: