[winswitch] auto-repeat keys with xpra

Anthony Stone ajs1 at cam.ac.uk
Fri Jul 21 08:57:51 BST 2017


Thanks for the clarification. Turning off keyboard-sync seems to solve
the problem.


On 19/07/17 20:44, Antoine Martin via shifter-users wrote:
> On 19/07/17 23:59, Anthony Stone via shifter-users wrote:
>> I have been using xpra for a while to connect from home over broadband
>> to my office computer. It's generally fine, and I appreciate the work
>> that's gone into it, but there is an irritating feature: if I use the
>> auto-repeat by holding down a delete or cursor key, the display doesn't
>> keep up with the auto-repeat, so it's impossible to stop at the right
>> point.
> I guess you're saying that their is a delay between key events and
> screen updates.
> That is inevitable if your connection has any kind of latency.
> The key events have to travel to the server, and the screen updates back
> to the client. Those two things happen independently, asynchronously.
>> Presumably every repeat has to be sent to the server and
>> reflected back before it's displayed.
> Sort of. There are two modes: with and without keyboard synchronization.
> You can toggle between these modes from xpra's system tray menu.
> For more information, see:
> https://xpra.org/trac/wiki/Keyboard
>> This didn't happen with NX, which
>> I used to use, and as xpra is apparently based on NX,
> Xpra has absolutely nothing in common whatsoever with NX, thankfully.
> The only website that I know of which claims otherwise happens to have a
> vested interest in this matter..
>> would it be
>> possible to echo the cursor position or deletion locally in real time
>> even if the server takes a while to catch up?
> No, that's absolutely impossible. Tools like mosh can do that for
> terminal emulators, but this just cannot be done for GUI applications.
> It might be possible to do better at getting the screen updates to your
> client, but you would have to give a lot more information on your use
> case and bandwidth conditions (preferably in a ticket):
> https://www.xpra.org/trac/wiki/ReportingBugs
> (and try turning off keyboard-sync first)
> Cheers
> Antoine
>> Thanks,
>> Anthony
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