Okay, let's stick with Oneiric. I assume that when the machine comes up with no backlight, adjusting the brightness (by using Hotkeys or the GUI) doesn't work either?
If that's correct, here's a couple of things you can test: 1. see what's in acpi_video/bl_power 2. when you try to adjust the brightness, do acpi_video/brightness and /actual_brightness change? Are they still in sync? 3. control the backlight acpi_video0 manually (by writing to acpi_video0/brightness) and see if /brightness or /actual_brightness change 4. reboot with 'acpi_backlight=vendor' on the command line (& confirm that acpi_video0 no longer shows up in sys/class/backlight) and go through the same routine with intel_backlight [the documentation for /sys/class/backlight is at http://kernel.ubuntu.com/git?p=ubuntu/ubuntu- oneiric.git;a=blob_plain;f=Documentation/ABI/stable/sysfs-class- backlight ] (btw: what's in /sys/class/backlight on your Maverick system? Are you able to change the brightness on that system?) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/826386 Title: No backlight display Acer Aspire 5734Z To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/826386/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
