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https://issues.apache.org/jira/browse/GUACAMOLE-518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394463#comment-16394463
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Michael Jumper commented on GUACAMOLE-518:
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{quote}
How come it is working in Windows RDP ?
{quote}
Presumably, Windows RDP does not handle receipt of a Caps Lock key event in the
same way as XRDP.
> Shift incorrectly sent for uppercase letters while Caps Lock is active
> ----------------------------------------------------------------------
>
> Key: GUACAMOLE-518
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-518
> Project: Guacamole
> Issue Type: Bug
> Components: RDP
> Environment: Remote operating System : Ubuntu 16.04.3 LTS 64-bit
> Local Browser : Chrome Version 64.0.3282.186 (Official Build) (64-bit)
> XRDP Version : 0.9.5
> Guacamole-Server Version : Latest Code [ Last Commit ID :
> bc5b01d4d8ab0c3c89a08007316d33012261f6b3 - GUACAMOLE-448: Merge support for
> configuring the level of caching used by RDP. ]
> Guacamole-Client Version : Latest Code [ Last Commit ID :
> 5db2e3cae75a658b33515112a39eb2f5f8eef4a8 - GUACAMOLE-161: Merge changes
> adding Caps Lock to the do-not-auto-repeat list. ]
> Reporter: Amarjeet Singh
> Assignee: Michael Jumper
> Priority: Minor
>
> As reported [in the user@ mailing
> list|https://lists.apache.org/thread.html/6008116eac7ebf2fdd51460672040b07b46c30c610b05a198575c05e@%3Cuser.guacamole.apache.org%3E]:
> {quote}
> I have been writing in Libre Office Writer on Guacamole RDP . I clicked CAPS
> lock and started writing but the text was still in lowercase.
> Guacamole-Server version : 0.9.14
> Guacamole-Client version : 0.9.14
> XRDP Version : 0.9.5
> Remote O.S. : Ubuntu 16.04.3 LTS 64-bit
> I have not done any modifications in the code.
> If I reconnect the RDP session with CAPS lock on, then it starts printing
> uppercase but if I again click CAPS lock to set it to lowercase, it still
> prints the uppercase.
> {quote}
> This is apparently due to the way Guacamole's RDP support handles uppercase
> letters and Caps Lock:
> * The client side of Guacamole handles Caps Lock correctly, and forwards this
> key as a key event to the Guacamole server.
> * The RDP support handles the _key_ correctly, sending the corresponding
> scancode to the RDP server.
> * The RDP support handles the Caps Lock _state_ incorrectly, continuing to
> send Shift keypresses for uppercase letters despite Caps Lock being active.
> The RDP support needs to be modified such that the behavior of keys within
> each keyboard layout when Caps Lock is enabled, various modifiers are
> active/inactive, etc. can be correctly modeled. The keymaps currently only
> provide for defining behavior based on modifiers.
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