ISSUE: Backlight brightness does not change.
More Detail: Brightness will not change, using both 'System Settings->Screen', or Fn keys (Brightness bar shows and moves, but screen brightness does not change).
Noticed a post about having multiple folders in Sys->Class->Backlight. I HAVE TWO FOLDERS TOO:
Using the function keys, alters the value in the
acpi_video0's 'Brightness' file - But doesn't actually alter the brightness of the screen.
If I add
backlight=vendor in Grub, my function keys then edit the value in the
Intel_Backlight brightness file. - But again doesn't actually change the brightness of the screen.
Computer: Fujitsu Siemans Pi2515, Intel Integrated Graphics, No HDD partition.
Editing grub to contain:
sudo apt-get install acpi sudo setpci -s 00:02.0 F4.B=20
Brightness does not adjust in fallback mode either.
Reinstalling OS, Using Linux Mint (Same problem).
Upgrading and downgrading BIOS.
Many thanks for reading, I understand this problem may need a bit of a Linux pro to sort. If anyone up for the challenge I'll spend any amount of time being walked through this, posting results. Don't want to give up here!