This is more likely a 'hal' or kernel issue:
/usr/share/hal/scripts/hal-system-lcd-set-brightness
Currently has the following code for Sonys:
elif [ "$HAL_PROP_LAPTOP_PANEL_ACCESS_METHOD" = "sony" ]; then
# echo "{1..8}" > /proc/acpi/sony/brightness
# http://popies.net/sonypi/2.6-sony_acpi4.patch
echo "$((value + 1))" > $HAL_PROP_LINUX_ACPI_PATH
Does this work on your laptop. Could you also please include the DMI
decode data for your laptop as detailed on the HotkeyResearch page above
so that we can identify your laptop.
** Changed in: gnome-power-manager (Ubuntu)
Sourcepackagename: gnome-power-manager => hal
Importance: Undecided => Wishlist
Status: Unconfirmed => Needs Info
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Brightness Settings Don't Work
https://launchpad.net/bugs/76274
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