Public bug reported:
The screen brightness always start with 100% and typing the Fn + F2/F3
keys only makes to appear the pointer on the screen, but doesn't work.
To change the screen brightness, only in the System Configurations –
Brightness and Block, “every time that one switch on or restart the
notebook”.
If one want to change again “ in the same session”, when the application
window opens the screen brightness return to 100%.
I solve this problem changing the command line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=Linux acpi_backlight=vendor
splash"
even thus, at every restart one need to change the brightness, the
configuration doesn't hold.
My Notebook:
Samsung model 300E4A-AD1
Intel Core i5 2450M
Ubuntu 12.04 64bits
Graphic Processor Intel GMA HD
Chipset Intel HM65
** Affects: acpi (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/979495
Title:
Ubuntu-bug acpi
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