Thanks Carlos, So, I guess just switch to KDE or an alternative to gnome? -- Ryan McClue, Sydney
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, October 11th, 2021 at 9:54 AM, Carlos Garnacho <[email protected]> wrote: > Hi, > > On Mon, Oct 11, 2021 at 12:16 AM Ryan McClue [email protected] wrote: > > > PROBLEM: > > > > I'm on a fresh install of Ubuntu 20.04 (xorg 1.20.11), with 2 connected > > keyboards (built-in and USB). > > > > When I hit keys on each keyboard simultaneously in a program like firefox, > > gnome-terminal etc. stalling/lag occurs. > > > > It only happens for keyboards it seems as moving an external mouse and > > trackpad together causes no issues. > > > > TO REPRODUCE: > > > > To investigate the problem I wrote a simple C file (see attached > > 'xorg-lag.c', compile with $(gcc xorg-lag.c -o xorg-lag)) > > > > The program finds keyboard devices under /dev/input/event and uses epoll to > > poll them for input via the evdev interface. > > > > If I start entering keys on one keyboard and then switch to the other, the > > program stalls briefly. > > > > If I simultaneously enter keys on each keyboard the program stalls > > indefinitely until I stop entering keys. > > > > I have tested with different keyboards and experience the same result. > > > > If I switch to a virtual terminal and run I experience no lag. > > > > This makes me think it is a bug with xorg. > > It sounds like you mean > > https://gitlab.gnome.org/GNOME/mutter/-/issues/398 (although > > https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/1858 has more > > recent context). I don't think there's a single culprit here, and > > they're likely just indirectly relevant in this mailing list. > > Cheers, > > Carlos
