I have a w520 running Ubuntu 11.10 64-bit with the graphics option set to discrete in the BIOS. I was experiencing the same system freezes when I tried to use fn+home/fn+end lcd brightness controls.
Adding 'nox2apic' to the boot options and the nvidia-specific EnableBrightnessControl=1 option in xorg.conf solved the problem for me. The brightness adjusts correctly and the OSD indicator works properly. The wireless kill switch and AC plug/unplug are all working fine as well. It looks like other, more drastic acpi kernel options work as well, but I'm happy with this relatively minor twiddle. Hopefully this is something that will be fixed in the upstream kernel. -- 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
