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
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https://bugs.launchpad.net/bugs/1551115
Title:
"Password incorrect" after wakeup from suspend
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