[winswitch] Keyboard key repetition

Timothy Hobbs timothy at hobbs.cz
Wed Feb 8 17:56:11 GMT 2017

I will try running without the clipboard. However firefox only starts 
having this problem occasionally, so it might be a long time before I 
would be sure that running without the clipboard helped. And of course, 
disabling the clipboard is painful. Perhaps I should try creating some 
test setup instead, that would send random keyboard events to a firefox 
running on a test vm...

I believe that only the window displaying firefox freezes.

On 02/06/2017 07:03 AM, Antoine Martin via shifter-users wrote:
> On 06/02/17 07:50, Timothy Hobbs via shifter-users wrote:
>> Hello,
>> I have a weird problem using subuser with the xpra-x11 bridge
>> http://subuser.org/news/0.3.html#the-xpra-x11-bridge. Sometimes, not
>> always, but sometimes, I end up with a situation in firefox, that when I
>> press a key, the key stays down and starts repeating. So if I am
>> backspacing, it will delete the entire line, or I'll get
>> nnnnnnnnnnnnnnnnnnnnn. When this happens, firefox freezes before the
>> repeated keypresses appear.
> That sounds like the whole process is stuck, it may have little to do
> with the keyboard which may just be a symptom.
> Can you try running with the clipboard disabled?
> Some clipboard issues have been reported, clipboard bugs may be able to
> cause such problems.
>> Is it possible, in the xpra api, that you
>> are sending first a key-down and then a key-up, and some sort of delay
>> in the protocol causes the x11 server on the container side of the
>> bridge to think that the key was held down and that repetition should
>> occure?
> By default, we send key-up and key-down events as they occur.
> But this can be changed with the "keyboard-sync" switch, see:
> https://xpra.org/trac/wiki/Keyboard
>> Where would I look in the code to try to fix this bug?
> The most important thing is to find the cause first, only then can you
> start looking at the code.
> If this is a regression, when did start? Is it platform specific?
> Do all the processes stall, or just firefox? Or X11?
> Have you tried enabling debug logging?
> etc.
> Cheers
> Antoine
>> Regards,
>> Timothy Hobbs
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