Public bug reported:
Binary package hint: kde-guidance-powermanager
I have a SONY VAIO Z1RSP laptop.
When unplugging the power adapter the screen brightness is not adjust in
accordance with the settings in the new "Power Management" dialog.
The laptop keys to adjust the screen brightness and gnome's Power
Manager utility both work, so I am assuming this is not a problem with
the kernel. The /etc/acpi/sonybright.sh script also works correctly.
I didn't have any luck trying to set the value using HAL/DBus and the
commandline dbus-send tool though:
[EMAIL PROTECTED]:~$ dbus-send --print-reply --system
--dest=org.freedesktop.Hal /org/freedesktop/Hal/devices/acpi_brightness
org.freedesktop.Hal.Device.LaptopPanel.SetBrightness int32:2
method return sender=:1.0 -> dest=:1.101
uint32 2
I believe another VAIO user reported a similar problem in the "Kubuntu Power
Management Feedback" wiki page.
Below is output from hal-device which I hope is relevant:
----------------
9: udi = '/org/freedesktop/Hal/devices/acpi_brightness'
info.udi = '/org/freedesktop/Hal/devices/acpi_brightness' (string)
org.freedesktop.Hal.Device.LaptopPanel.method_execpaths = {
'hal-system-lcd-set-brightness', 'hal-system-lcd-get-brightness' } (string list)
org.freedesktop.Hal.Device.LaptopPanel.method_signatures = { 'i', '' }
(string list)
org.freedesktop.Hal.Device.LaptopPanel.method_names = { 'SetBrightness',
'GetBrightness' } (string list)
info.interfaces = { 'org.freedesktop.Hal.Device.LaptopPanel' } (string list)
linux.hotplug_type = 4 (0x4) (int)
info.capabilities = { 'laptop_panel' } (string list)
laptop_panel.num_levels = 8 (0x8) (int)
laptop_panel.access_method = 'sony' (string)
info.product = 'Sony LCD Panel' (string)
info.category = 'laptop_panel' (string)
info.parent = '/org/freedesktop/Hal/devices/computer' (string)
linux.acpi_type = 8 (0x8) (int)
linux.acpi_path = '/proc/acpi/sony/brightness' (string)
------------------------
** Affects: kde-guidance (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
Screen brightness not altered when AC adapter is unplugged
https://launchpad.net/bugs/72120
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