Hi Zsolt,
we are testing again the solution to that Trouble Report in our labs, but we are unable to reproduce any problem so far, so it has to be some corner case. The user who originally reported the problem never got back to us.
We are preparing a test build for you to test. In the meanwhile, can you try to disable the autorepeat completely by the “xset r off” command on the Ubuntu remote server? Just to exclude the possibility we are looking in the wrong direction… 🙂