Before everybody stumbling upon this bug disables "legacy USB support" one WARNING: This feature is required to boot from USB storage (sticks, cdrom, etc.), and (AFAIK) to be able to change BIOS settings using an USB keyboard.
The main reason for posting the information was to provide another piece of information which might help identifying the root cause for the bug. If disabling "legacy USB support" does not harm you, it is nevertheless a viable solution.
Before everybody stumbling upon this bug disables "legacy USB support" one WARNING: This feature is required to boot from USB storage (sticks, cdrom, etc.), and (AFAIK) to be able to change BIOS settings using an USB keyboard.
The main reason for posting the information was to provide another piece of information which might help identifying the root cause for the bug. If disabling "legacy USB support" does not harm you, it is nevertheless a viable solution.