Hey there, thanks for the discussion, it's helped me find a way around
this problem.
I also use an R-Go split keyboard. I had the input lag issue OS-wide on
Elementary OS and Pop OS. The issue disappears on Wayland.
After switching to Regolith, which uses gnome-flashback, the issue is no
longer there. There is one big exception, though: there's still the same
problem on Firefox! All other apps are doing just fine.
I wonder whether I can somehow overcome the problem on Firefox as well.
I'm no longer sure whether it's a problem in the interaction between
Firefox and Xorg or it's a Firefox-specific problem.
** Bug watch added: Mozilla Bugzilla #1640535
https://bugzilla.mozilla.org/show_bug.cgi?id=1640535
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https://bugs.launchpad.net/bugs/108
Title:
Desktop briefly becomes unresponsive when typing on 2 keyboards at the
same time
Status in GNOME Shell:
Unknown
Status in gnome-shell package in Ubuntu:
Confirmed
Status in mutter package in Ubuntu:
Confirmed
Bug description:
I'm running Ubuntu 18.04 and Gnome 3.28.1 with all the latest updates
from the repos.
If I connect 2 (or more) keyboards to my computer and type on both at
the same time, the desktop briefly becomes unresponsive. More
keypresses increase the time of unresponsiveness.
E.g. when typing a full sentence in gedit or the terminal, only very
few characters show up on the screen (I guess up until something is
pressed on both keyboards at the same time), then everything freezes.
Then after a while (some seconds), all the characters show up. And the
desktop becomes responsive again.
Symptoms: During the freeze, windows stop updating their content. If
seconds are enabled on the clock at the top middle, these freeze too.
But I'm still able to move the mouse pointer around during the freeze
without any problems.
The back story:
I got an ergonomic keyboard (R-Go Split Keyboard) yesterday, and
quickly noticed the issue. But initiallly I thought it was an issue
with the keyboard, and the problem wasn't that bad. But as I've gotten
more used to the keyboard since yesterday and started picking up a
proper typing speed, things got worse.
The keyboard is technically two separate cabled USB keyboards each
with only about half of they keys of a normal keyboard (or at least
that's very much my impression).
After getting the suspicion that this was a software issue, not a
hardware issue, I tried typing on my old Logitech keyboard (Unifying
Receiver) along with one of the R-Go halves: Same issue. Then I tried
each of the halves without the other (as in "single" keyboard typing):
No issue. Then I connected another Logitech keyboard (separate UR),
typed on both Logitechs: Same issue.
Some further observations:
1) Nothing of significance in my syslog.
2) If I drop to a non-graphical shell, there's no problem. I suspect this
issue is related to X.org or Gnome, but I'm in no position to say anything
credible about that.
3) Also no problems when connecting the R-Go keyboard to a Windows or a MacOS
machine.
Let me know if there are any logs I can provide or things I can run to
produce useful debug output.
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