I did further investigation。 The reason is that, when using
Nvdia-340.104 driver, I am not able to type any UPPERCASE letters using
the CapsLk key. I discovered this when I click the "Not listed?" link
and then type letters in the username input field. All appercase letters
are accepted as lowercase only.
A workaround is to user Shift+[a-z] keys to type in uppercase letters.
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Unable to login when using Nvdia-340.104 driver ("password is
incorrect" when password contains UPPERCASE letters)
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