>Dear Friends
>I installed Ubuntu Netbook 10.10 in a partition alongside the provided
>Windoze 7 in my new-last-week Samsung N145.
>It's a lot easier to get into the system on my PC running Ubuntu 10.10.
>As a relative newcomer to Linux I've been working at learning to use
>Terminal and thought that was coming along nicely until I came upon my
>current problem: I can't get the display to un-dim.
>In Windoze mode the 'Fn' and 'up' or 'down' buttons control brightness
>OK, but using these in Linux brings up an on-screen flickering slider
>which doesn't work and necessitates an escape routine with the on-off
>switch.
>I got into 'Power Management Preferences' and the sliders there don't
>work - the screen stays in power-saving rather-dim mode.
>Clicked on 'Help' and there is lots of apparently useful stuff there and
>a 'pinned post-it' : "Some sliders or option boxes may be disabled if
>the GConf policy keys are not writable. This allows administrators to
>lock down the actions that a user can select."
>So I tried Terminal but can't find a way into GConf or
>/app/gnome-power-manager/backlight/idle_brightness
>When I first installed Linux on the machine, I am sure the brightness
>was fine but I don't know what I did that changed it.
>
>Any ideas on how I could control the display backlight please?
>
>Tony Wood
Try the following (from French Ubuntu forum):
sudo add-apt-repository ppa:voria/ppa
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install samsung-tools samsung-backlight
sudo reboot
It appears on some systems the function keys begin working but the brightness does not change. In this case, try appending “acpi_backlight=vendor” to the GRUB_CMDLINE_LINUX line in Suspend / Resume below.
GRUB_CMDLINE_LINUX=”acpi_sleep=nonvs acpi_backlight=vendor”
