Gnome - dual seat, nvidia + intel, mouse focus

[Sayen]

Hi experts,
I do need some help, advice. I was unable to find error log, if there exists any. Thus no debug information. Maybe You could help me narrow what is wrong in my configuration.

Problem is that moving mouse cursor to position not always (sometimes it works normally, but mostly not) trigger action. Like highlight user (or button), allowing it to be selected in gdm. Or in gnome 3 when logged in.
My desktop has two seats (configured with loginctl, out-of-the-box) and it happens only on seat2. I tried switching mouses, and usb ports. No result. Works on seat0 and not on seat2 independent from input hardware.
Seat0 is using nvidia card. Seat2 has intel (on board) display.
X configuration is auto created. (with exception to nvidia modules and driver)

ps -Af|grep X
root      1317  1310  0 10:19 ?        00:00:18 /usr/bin/X :1 -background none -verbose -auth /var/run/gdm/auth-for-gdm-JU1a4G/database -seat seat2 -nolisten tcp -config /run/systemd/multi-session-x/seat2 -sharevts
root      1318  1308  1 10:19 tty1     00:01:20 /usr/bin/Xorg :0 -background none -verbose -auth /var/run/gdm/auth-for-gdm-FCXSw0/database -seat seat0 -nolisten tcp vt1

cat /run/systemd/multi-session-x/seat2
Section "ServerFlags"
        Option "AutoAddDevices" "True"
        Option "AllowEmptyInput" "True"
        Option "DontVTSwitch" "True"
EndSection
Section "InputClass"
        Identifier "Force Input Devices to Seat"
        Option "GrabDevice" "True"
EndSection

When one logs to other than gnome window manager (like XFCE) no mouse problems are observed on seat2

Any hints and ideas are mostly welcomed.

Regards
Jan

[george_toolan]

When one logs to other than gnome window manager (like XFCE) no mouse problems are observed on seat2

Problem solved ;-)

Check ~/.xsession-errors for Gnome errors.

[Sayen]

Originally Posted by george_toolan

Problem solved ;-)

Check ~/.xsession-errors for Gnome errors.

For gdm user? As it is the one who runs login screen?

And to be precise, neither logged user neither /var/lib/gdm contains .xsession_errors. It would be my first shot looking clues. So far I can't figure out if some component is even writing error log.

All I have is user observations, not something one could easy google about...

Regards
Jan

[george_toolan]

You also said

Or in gnome 3 when logged in.

If the problem is just with gdm you could use a different display manager like kdm.

[Sayen]

Yes, You are right.
Both gdm and then gnome3 are places where issue can be observed.

I tried with kdm, but it looks like it does not handle dual seat out-of-the-box.
As pointed, there is workaround, and I can live with it.
But I would prefer to at least know what is wrong. Maybe create a bug report or something like that to pin error down.

Regards
Jan