same problem on vgn-fe31z
here the problem is solved using smartdimmer (only with nvidia)
on feisty change /usr/lib/hal/scripts/hal-system-lcd-set-brightness
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))" > $HAL_PROP_LINUX_ACPI_PATH
by
elif [ "$HAL_PROP_LAPTOP_PANEL_ACCESS_METHOD" = "sony" ]; then
# echo "{1..8}" > /proc/acpi/sony/brightness
# http://popies.net/sonypi/2.6-sony_acpi4.patch
smartdimmer -s"$(($value * 3))"
and /usr/lib/hal/scripts/hal-system-lcd-get-brightness
elif [ "$HAL_PROP_LAPTOP_PANEL_ACCESS_METHOD" = "sony" ]; then
# cat /proc/acpi/sony/brightness
# 7
value="`cat $HAL_PROP_LINUX_ACPI_PATH`"
value=$(($value-1))
by
elif [ "$HAL_PROP_LAPTOP_PANEL_ACCESS_METHOD" = "sony" ]; then
# cat /proc/acpi/sony/brightness
# 7
value="`smartdimmer -g`"
value=$(($value/3))
--
Brightness Settings Don't Work
https://bugs.launchpad.net/bugs/76274
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