Login as a user in Ubuntu 12.04, then switch to another user. Screen becomes blank and inactivated (LCD monitor does not receive any signal).
Occurs with ATI Radeon HD 4770. Problem also reported by others with NVidia driver, thus seam unrelated to driver. Not sure how to classify this bug.
Tracked on LaunchPad Bug #577997 (https://bugs.launchpad.net/nvidia-drivers-ubuntu/+bug/577997).
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