This is what happens when I tried "echo 5 > sudo tee /sys/class/backlight/acpi_video0/brightness". It instantly froze everything except the mouse pointer, which froze after about 10 seconds as well. You can see lots of erros in the log file.
** Attachment added: "Xorg.0.log.old" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999/+attachment/4210153/+files/Xorg.0.log.old -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/776999 Title: [Lenovo W520] laptop freezes on ACPI-related actions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
