I've noticed couple of similar reports for some older releases, but none of the proposed solutions worked for me: http://askubuntu.com/questions/459720/14-04-password-not-accepted-after-computer-wakes-up-from-sleep
I did not have such issues with 15.04. $ sudo lshw -c video *-display description: VGA compatible controller product: Seymour [Radeon HD 6400M/7400M Series] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:32 memory:c0000000-c7ffffff memory:cc400000-cc41ffff ioport:3000(size=256) memory:cc440000-cc45ffff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1551115 Title: "Password incorrect" after wakeup from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1551115/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs