On Sun, Jan 12, 2020 at 4:49 PM Hans Ulrich Niedermann <h...@n-dimensional.de> wrote:
> On Thu, 09 Jan 2020 16:51:36 +0100 > Nicolas Mailhot via devel <devel@lists.fedoraproject.org> wrote: > > > Le 2020-01-09 15:02, Stephen John Smoogen a écrit : > > > > > I have seen something like this happen in the past. I think it was > > > around Fedora 18? kernel time frame.. on certain Lenovo T440? if you > > > did a dd to a usb key, keyboard and mouse would be like you pointed > > > out. > > > > I get this all the time, with or without swap, with or without heavy > > copying. The kernel does not seem to understand the difference > > between latency-sensitive usb input and throughput-sensitive non > > input usb traffic. > > I have been noticing occasional occurences of the "key released" event > after a "key pressed" event not reaching the keypress repeat code in > time, so that a normal typing sssssuddenllly contains sommme repeated > letters which I have actually typed in a normal time sequence for > single letters. > > The one thing which I have noticed which appears to be statistically > related to that issue is whether I am running in a "GNOME" session or > a "GNOME on Xorg" session. The first time I have observed this was when > I tried "GNOME" (without Xorg) for the first time, and when I from time > to time tried "GNOME" (without Xorg) instead of my usual "GNOME on > Xorg" session, that behaviour occured again. > > In Fedora 31, the "GNOME" (non-Xorg) session delays the "key released" > events significantly less often than it did a year or two ago, but it > still happens occasionally. > > I would not link this issue to some kernel version. From my POV, a > "GNOME" (on Wayland without Xorg) session appears to use the rest of > the software stack in a different way than a "GNOME on Xorg" (on > Wayland) session, but where in that software stack I could look for the > issue, I have no idea whatsoever. > Yes, Wayland session is much more susceptible to mouse stuttering and keyboard events being repeated than Xorg session. So, Jan, if you run GNOME, try X11 whether that improves the problem.
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