Description of problem: When leaving the computer idle for sufficient time for the screen to go black (on standby) moving the mouse to wake the screen results in the screen coming back in a very dim (nearly dark) state. Version-Release number of selected component (if applicable): How reproducible: Behaviour first started occurring around 23:00 (GMT-5) 11/18/2011. Happens regularly since. Never happened previously. Likely caused by an update. Steps to Reproduce: 1. Leave computer unattended for 20 minutes or more so screen turns black. 2. Return, move the mouse or push a key. 3. Display will restore in a very dim state Actual results: Please see the above. Effects both 'normal mode' in GNOME 3.0 and in 'fallback mode'. Only impacts primary monitor in 'fallback mode', not the secondary monitor. Secondary monitor restores to full brightness. ('normal mode' does not support secondary monitor) Pushing <function><up arrow> restores the screen to normal operation. Expected results: Screen would restore itself to full brightness without the need for <function><up arrow>. Additional info: Observed on a Dell Latitude D820. This problem never occurred at all til time noted above. Expect it is the result of an update issued during the day of 11/18/2011 (GMT-5). This is not a serious bug.
I'm also seeing this with F15/openbox since I did a software update this Friday - even though I have the computer on the AC adapter all the time. The external monitor is still fine, but the internal display is very dim. My computer is a Dell Latitude D830. The brightness is restored by a reboot. In the BIOS, I've tried to switch the ambient light sensor off and the battery-powered standby backlight setting to full brightness, but to no avail. The <function><up arrow> work around does not work for me. I've found that I can regain brightness by toggling <function><CRT/LCD> twice, but this messes up the logical display arrangement and the window placement - both on the internal and external display. I then have to re-configure the logical display arrangement, and move the all windows back to where they belong.
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