Every few minutes my Ubuntu desktop freezes for a few seconds. I can move my mouse but clicking and the keyboard have no obvious effect.
While this is happening I see the following in my logs:
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) AIGLX: Suspending AIGLX clients for VT switch
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): NVLeaveVT is called.
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:75
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 226:0
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:69
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:66
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:68
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:67
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:65
May 11 15:04:07 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got pause for 13:64
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got resume for 13:75
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) systemd-logind: got resume for 226:0
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) AIGLX: Resuming AIGLX clients after VT switch
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): NVEnterVT is called.
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): EDID vendor "DEL", prod id 40976
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): Using hsync ranges from config file
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): Using vrefresh ranges from config file
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): Printing DDC gathered Modelines:
May 11 15:04:39 bb8 /usr/lib/gdm3/gdm-x-session[29416]: (II) NOUVEAU(0): Modeline "1920x1200"x0.0 154.00 1920 1968 2000 2080 1200 1203 1209 1235 +hsync -vsync (74.0 kHz eP)
I installed Ubuntu 18.04 LTS a couple days ago and this has been happening since then -- this was not occurring when I was running Ubuntu 14.04 on the same PC.