To add to Joseph's comment. there's something else worth looking at: if you look at your kernel log (BootDmesg.txt), you can see:
[ 0.000000] WARNING: at /build/buildd/linux-3.2.0/drivers/iommu/dmar.c:492 warn_invalid_dmar+0x8f/0xa0() [ 0.000000] Hardware name: HP Compaq dc7900 Small Form Factor [ 0.000000] Your BIOS is broken; DMAR reported at address fed90000 returns all ones! [ 0.000000] BIOS vendor: Hewlett-Packard; Ver: 786G1 v01.08; Product Version: This may be unrelated to the issue you're reporting, but I guess its worth to check if there is a BIOS update for your system. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1000255 Title: Logitech wireless keyboard & mouse stop working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1000255/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
