On 08/28/2017 03:27 PM, Christopher wrote:
One interesting thing I noticed with this: if I hit "Backspace" a few times before typing the password, it seems to work on the first attempt. For some reason, something seems to be polluting the input buffer during boot, which makes it behave as a wrong password on the first attempt. Not sure what that could be. Also, I still have no idea why it requires two subsequent attempts after that to decrypt, instead of the expected one.
This may or may not be your issue. So, just something to consider.
A few years ago I had the same problem not with encrypted partitions but with the login at the GUI prompt (I was using KDM back then) after boot. I had to remember to hit backspace a few times otherwise it would tell me the password was wrong. I have a wireless USB keyboard and it turned out to be the problem with the USB receiver. Replacing that fixed the issue.