Ubuntu

Screen goes dark when switching to/from external power

Bug #132521 reported by Dave Bekker
2
Affects Status Importance Assigned to Milestone
Ubuntu
Fix Released
Undecided
Unassigned

Bug Description

I am running Kubuntu Gutsy Tribe 4 (64 bit) on an HP Pavillion dv6204. When unplugging (or plugging into) the laptop from external power the screen goes almost black, but the workspace is still (barely) visible (i.e. it's not simply going "blank"). It is *much* darker than I am able to get when using the Fn+F7 keys (dimmer).

When I press Fn+F8 (lighten screen) keys, the screen immediately lights back up to the lowest possible light setting.

Revision history for this message
Dave Bekker (phyrexicaid-gmail) wrote :

If I close guidance-power-manager then the screen does not go dark, but I don't think this is a bug in guidance-power-manager. Booting into this kernal 2.6.20-16-generic and there is no problem.

Seems there is a problem in 2.6.22-9-generic.

Revision history for this message
Dave Bekker (phyrexicaid-gmail) wrote :

Here is the error message from guidance-power-manager when running from the terminal:

Warning: While setting SystemPowerManagement to True : org.freedesktop.Hal.Device.SystemPowerManagement.NotSupported: No powersave method found
Warning: While setting SystemPowerManagement to False : org.freedesktop.Hal.Device.SystemPowerManagement.NotSupported: No powersave method found

Revision history for this message
Dave Bekker (phyrexicaid-gmail) wrote :

This bug can be closed. The latest update fixed the problem. The new version of guidance-power-manager has sliders that adjust screen brightness, based on whether it's on internal or external power.

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