Ubuntu
gnome-power-manager package

on unsuspend g-p-m alters the backlight level even if power status not changed

Bug #34897 reported by Paul Sladen on 2006-03-14

This bug report is a duplicate of: Bug #1270579: On laptops, screen brightness and keyboard backlight isn't memorized between sessions. Edit Remove

Affects		Status	Importance	Assigned to	Milestone
	gnome-power	Confirmed	Unknown	gnome-bugs #335673
	gnome-power-manager (Ubuntu)	New	Medium	Unassigned

Bug Description

If the backlight brightness has been altered (for example it's a sunny day) and then the machine is suspended; on unsuspend the backlight brightness will suddenly jump back to the level configured in g-p-preferences after a couple of seconds, even if the AC power status as not changed.

This looks fairly unslightly and it isn't necessarily want is wanted.

Ideally g-p-manager should only act on its internal settings when a change of state occurs ('edge' rather than 'level').

This also appears to happen when the screensaver deactivates and comes back to the desktop.

See original description

Paul Sladen (sladen) on 2006-03-14

description:	updated
description:	updated

Revision history for this message

Richard Hughes (richard-hughes) wrote on 2006-03-14:

How did you modify the brightness of the laptop panel without using g-p-p?

Revision history for this message

Paul Sladen (sladen) wrote on 2006-03-14:

Fn-Home/Fn-End. Aswell as generating nvram events on the ThinkPad these also get handled directly by the hardware.

The long-term solution is to map all the hot-keys through the input layer. Take the key-event, examine the appropriate hardware-state and if nothing has changed then process the action in software. Wifi/BT toggle, VGA/TFT and Volume are other examples of events that may or may not be handled at a lower-level, but which still generate the key-action.

Revision history for this message

Paul Sladen (sladen) wrote on 2006-03-14:

Just noticed that is related:

https://launchpad.net/bugs/34743

Revision history for this message

Richard Hughes (richard-hughes) wrote on 2006-03-14:

But we can cope with that, as g-p-m could read the brightness and then set it to this value on resume, rather than just enforcing the policy brightness.

>The long-term solution is to map all the hot-keys through the input layer.

Agreed.

Richard.

Bug Watch Updater (bug-watch-updater) on 2009-02-22