Here's a somewhat interesting account from what seems to me like a duplicate. I think I can confirm what he says about values in /proc/acpi/video/VID/LCD0/brightness
Bug #613638 Adjusting brightness broken after hibernate/suspend
Here's a somewhat interesting account from what seems to me like a duplicate. I think I can confirm what he says about values in /proc/acpi/ video/VID/ LCD0/brightness
Bug #613638
Adjusting brightness broken after hibernate/suspend