Dear All, I just tested this last patch, and it works for me on my ASUS UL20A. (intel GMA 4500HD)
below some detailed infos: $ uname -a Linux rgw2 3.0.0-13-generic #22+kamal~fix~stuck~backlight3-Ubuntu SMP Fri Nov 18 01:04:58 UT i686 i686 i386 GNU/Linux $ cat /proc/cmd* BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic root=UUID=212683b0-1b69-4969-a259-665b422074e3 ro quiet splash acpi_backlight=vendor vt.handoff=7 ~$ ls -l /sys/class/backlight total 0 lrwxrwxrwx 1 root root 0 2011-11-23 13:41 asus_laptop -> ../../devices/platform/asus_laptop/backlight/asus_laptop lrwxrwxrwx 1 root root 0 2011-11-23 13:41 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight My Hardware: ASUS UL20A $ lspci -nn 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) 00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07) I use acpi_backlight=vendor, to have backlight control button work. Without this option, the buttons are recognized, but have no dimming effect and cause somewhere a waiting loop between 2 actions. Also, sometime the screen switch off without any reason. Manual dimming can be done using command sudo setpci -s 00:02.0 F4.B=xx where xx is dimming percentage. **** before the patch $ xset s activate => switch off the screen lock screen, and wait for screen off, then unlock: the screen stay stucked at brightness 0 (off) **** after the patch $ xset s activate => swicth off then on the screen lock screen, and wait for screen off, then unlock: the screen switch back on at previous dim level. without acpi_backlight=vendor and without the patch the behaviour, seems quite normal, except that brightness control is not possible with the keyboard, brightness is off or max. CONCLUSION: -Default systems works without dimming control -Dimming control requires acpi_backlight=vendor which activates the bug, and proposed patch is ok. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/872652 Title: screensaver backlight stuck off, system looks hung To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-settings-daemon/+bug/872652/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
