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: