Comment 1 for bug 247475

I can confirm this on my Advent 4211 (rebranded MSI Wind netbook), though when I reopen the lid it defautls back to 100%. I like to use mine at lower settings - especially on evenings.

KDE 8.04.1.
         $ uname -a
         Linux tleilax 2.6.24-21-generic #1 SMP Mon Aug 25 17:32:09 UTC 2008 i686 GNU/Linux

         $ apt-cache policy kdm
         kdm:
           Installed: 4:3.5.10-0ubuntu1~hardy1
           Candidate: 4:3.5.10-0ubuntu1~hardy1
           Version table:
          *** 4:3.5.10-0ubuntu1~hardy1 0
                 500 http://se.archive.ubuntu.com hardy-backports/main Packages
                 100 /var/lib/dpkg/status
              4:3.5.9-0ubuntu7.3 0
                 500 http://se.archive.ubuntu.com hardy-updates/main Packages
              4:3.5.9-0ubuntu7 0
                 500 http://se.archive.ubuntu.com hardy/main Packages

Moreover, the (KDE) power manager, which seems to manage the keybinds for raising and lowering the brightness, stops working if brightness is set to 0% before closing. The manager still *thinks* it's at 0%, while it's actually at 100%, so the keybinds no longer work. The popup spawns saying "0%", but it won't raise. Changing /proc/acpi/video/*/LCD/brightness to anything other than the minimum value (20 for me) makes it work again. So to not lose control over brightness setting as a non superuser, I have to make sure it's not at the lowest setting when closing the lid. Superuser permissions is required to fix it.

I tried modifying /etc/acpi/lid.sh to copy the /proc brightness file upon lid close and restore it upon opening, but it seems that at some point in the lid-close scripts it *sets* the brightness to 20. No matter what setting I had it always saved my temporary file with "20". I'm not sure why.

         grep current /proc/acpi/video/IGD/LCD/brightness | awk -F": " '{ print $2 }'

Anyway, even with those extra lines in the script resetting the brightness to 20 upon opening, it automatically rises to 100% as soon as I move the mouse or press any key.