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[jjb3nl <jjb3nl@xxxxxxxxx>]

Experiencing almost the same here. After 10 minutes of inactivity, the
screen turns off. When moving the mouse, only the cursor is visible. The
rest of the screen looks like the backlight is off. When pushing
Alt+Ctrl+F1 and then Alt+Ctrl+F7, the brightness is restored. No login
screen was displayed. I have the same isue when locking the machine,
cursor stays visible, rest not. Typing password+enter restores
visibility again.

System;
Ubuntu 11.10 x64
Intel® Core™2 Quad CPU Q9550
ATI Radeon HD 4870 X2 (fglrx 11.12) - one monitor

End of syslog;
Jan  7 12:59:27 dennis-desktop kernel: [ 3241.524210] gnome-screensav[2344]: segfault at 5 ip 00007f1793d39859 sp 00007fff5a342a00 error 4 in libcairo.so.2.11000.2[7f1793d00000+b9000]
Jan  7 12:59:27 dennis-desktop gnome-session[2262]: WARNING: Detected that screensaver has left the bus
Jan  7 13:17:01 dennis-desktop CRON[3886]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jan  7 13:22:06 dennis-desktop kernel: [ 4600.536160] vgaarb: this pci device is not a vga device
Jan  7 13:59:17 dennis-desktop kernel: [ 6832.000641] vgaarb: this pci device is not a vga device
Jan  7 13:59:18 dennis-desktop kernel: [ 6832.494666] gnome-screensav[3983]: segfault at 5 ip 00007f9c72ab6859 sp 00007fffc0aeb390 error 4 in libcairo.so.2.11000.2[7f9c72a7d000+b9000]
Jan  7 13:59:18 dennis-desktop gnome-session[2262]: WARNING: Detected that screensaver has left the bus
Jan  7 14:16:02 dennis-desktop kernel: [ 7836.126481] vgaarb: this pci device is not a vga device
Jan  7 14:17:01 dennis-desktop CRON[4442]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jan  7 14:25:49 dennis-desktop kernel: [ 8423.137963] gnome-screensav[4746]: segfault at 5 ip 00007fd3cc610859 sp 00007fff30c4e370 error 4 in libcairo.so.2.11000.2[7fd3cc5d7000+b9000]
Jan  7 14:25:49 dennis-desktop gnome-session[2262]: WARNING: Detected that screensaver has left the bus

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-settings-daemon in Ubuntu.
https://bugs.launchpad.net/bugs/844241

Title:
  Backlight not restored when moving the mouse

Status in Unity Greeter:
  Confirmed
Status in “gnome-settings-daemon” package in Ubuntu:
  Confirmed
Status in “unity-greeter” package in Ubuntu:
  Confirmed

Bug description:
  I've upgraded my laptop from natty to oneiric and I've noticed that
  when I leave the pc idle (or I manually lock the screen) the backlight
  is not restored when I move the mouse or press a key, but I must turn
  it on and increase it using the keyboard button.

  It is the same behaviour than in this old bug #199522.

  After additional testing I've noticed that the problem is independent
  from "dim on idle"

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