Re: [Hampshire] Netbook LCD brightness (Tony Wood)

> On Tue, 2011-04-05 at 06:20 -0400, matthammal@??? wrote:
>>> 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”