Brightness

[Toz]

I'm tempted to suggest blacklisting the toshiba_acpi module, but I'm worried about what other negative effects it might have (function keys, fans, battery, etc). Plus I'm not sure if it will remove the toshiba interface.

Have you tried the combination of acpi_backlight=vendor and Option "RegistryDwords" "EnableBrightnessControl=1"?

And a bit of a long shot - bios update?

[kurci2]

Now, my /etc/default/grub file look like this:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

an my /etc/X11/xorg.conf like this:

Section "Device"
	Identifier	"Default Device"
	Option	"NoLogo"	"True"
	Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

I have restarted my computer and run sudo update-grub, but my brightness still doesn't work...
And my BIOS is updated to the latest version.

I am wondering why Ubuntu uses acpi_video0 and Kubuntu uses toshiba... If only i could make Kubuntu to use acpi_video0

[Toz]

I am wondering why Ubuntu uses acpi_video0 and Kubuntu uses toshiba... If only i could make Kubuntu to use acpi_video0

Sorry but I don't use KDE. After some brief googling, it looks like powerdevil controls the backlight interface in KDE. Maybe there is an issue with powerdevil?

[kurci2]

Well, this might be the last thing i tried which might help

I have tried Linux Mint 12 KDE and everything worked there. Even in /sys/class/backlight was only folder acpi_video0 and no toshiba.
So it is Kubuntu problem, not KDE...
Or maybe it is the difference between KDE 4.7 and KDE 4.8?

[kurci2]

More information.
I have tried Linux Mint 13 KDE RC with KDE 4.8 and guess what: brightness DOES NOT work and folder toshiba IS present

So my conclusion: It is issue with KDE 4.8, so i can just gor back to Ubuntu and wait for fix =) (i guess...)

Edit:
Yes, it is KDE 4.8 issue.
I have updated KDE on Kubuntu 12.04 to 4.8.90 and brightness works there. And KDE uses acpi_video0 =)
So i guess that i will just use that version of KDE =)