Attempts (on a current Lucid beta) to control the screen brightness on
my Dell Studio 1558 fail with the following errors reported in dmesg:
[ 1162.236365] ACPI: Failed to switch the brightness
[ 1162.379144] ACPI: Failed to switch the brightness
[ 1162.538226] ACPI: Failed to switch the brightness
[ 1162.667358] ACPI: Failed to switch the brightness
[ 1162.784171] ACPI: Failed to switch the brightness
This is true both for the keyboard's brightness controls (Fn-F4,
Fn-F5) and for a gnome-brightness-applet on the panel.
Attempts (on a current Lucid beta) to control the screen brightness on
my Dell Studio 1558 fail with the following errors reported in dmesg:
[ 1162.236365] ACPI: Failed to switch the brightness
[ 1162.379144] ACPI: Failed to switch the brightness
[ 1162.538226] ACPI: Failed to switch the brightness
[ 1162.667358] ACPI: Failed to switch the brightness
[ 1162.784171] ACPI: Failed to switch the brightness
This is true both for the keyboard's brightness controls (Fn-F4, s-applet on the panel.
Fn-F5) and for a gnome-brightnes
Output of acpidump, dmesg and lspci is attached.