* Reboot with only the kernel parameter acpi_backlight=vendor :
* Make a comment on if you can now alter the backlight with hotkeys or a
brightness applet.
That did not work.
* ls /sys/class/backlight > vendorbacklight
See attachments.
* If you have the folder /sys/class/backlight/intel_backlight/ :
* type sudo su , and then execute:
* ls -la /sys/class/backlight/intel_backlight/ > lslabacklight
See attachments.
* echo 8 > /sys/class/backlight/intel_backlight/brightness
Screen became almost black, and I had to reboot, as I wasn't seeing
anthing .
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https://bugs.launchpad.net/bugs/1329510
Title:
Backlight setting on Asus X200M
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