These 3 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)
And these 2 don't work (tee:
/sys/class/backlight/intel_backlight/brightness: Invalid argument)
4. echo 30000 | sudo tee /sys/class/backlight/intel_backlight/brightness
5. echo 60000 | sudo tee /sys/class/backlight/intel_backlight/brightness
I tried 4 and 5 with root (sudo su) and without the "sudo" and returned
the same error...
I will read this wiki about backlight, thank you
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https://bugs.launchpad.net/bugs/1891032
Title:
Brightness key freeze screen
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