It seems this is related to atl1c somehow: http://linuxnorth.wordpress.com/2011/10/23/wireless-less/
sudo gedit /etc/modprobe.d/blacklist.conf add the line: blacklist atl1c (2) Open Terminal and issue the command: sudo update-initramfs -u Restart Laptop is a workaround. No more wired Ethernet anymore, but the laptop does not crash anymore too. ** Tags added: atl1c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/989566 Title: Acer Aspire 7250 laptop with Atheros AR9485 freezes when Enabling Wireless in 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/989566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs