0. install acpidbg - sudo apt install linux-tools-`uname -r` linux-
tools-generic
trigger and check which of the following cause screen freeze
1. sudo acpidbg -b "e EV5 1 0" ("2 0" for brightness down)
2. sudo acpidbg -b "e \_SB.PCI0.GFX0.BRT6 1 0" ("2 0" for brightness down)
3. sudo acpidbg -b "notify \_SB.PCI0.GFX0.LCD 0x86" (0x86 for brightness down)
4. echo 30000 | sudo tee /sys/class/backlight/intel_backlight/brightness
5. echo 60000 | sudo tee /sys/class/backlight/intel_backlight/brightness
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https://bugs.launchpad.net/bugs/1891032
Title:
Brightness key freeze screen
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