Thanks. It looks like sddm has started before the freeze begins, and
only continues after the freeze completes. The source of the freeze for
sddm looks like a combination of adding the new display, network
problems, and problems with nvme0 (WD_BLACK SN770M 2TB):
Jun 01 20:12:04 mlaptop sddm[1944]: Adding new display...
...
Jun 01 20:12:46 mlaptop chronyd[1743]: NTS-KE session with 185.125.190.122:4460
(1.ntp.ubuntu.com) timed out
Jun 01 20:12:46 mlaptop chronyd[1743]: NTS-KE session with 185.125.190.123:4460
(2.ntp.ubuntu.com) timed out
Jun 01 20:12:47 mlaptop chronyd[1743]: NTS-KE session with 91.189.91.112:4460
(3.ntp.ubuntu.com) timed out
Jun 01 20:12:47 mlaptop chronyd[1743]: NTS-KE session with 91.189.91.113:4460
(4.ntp.ubuntu.com) timed out
Jun 01 20:12:47 mlaptop chronyd[1743]: NTS-KE session with 91.189.91.111:4460
(ntp-bootstrap.ubuntu.com) timed out
Jun 01 20:12:47 mlaptop chronyd[1743]: NTS-KE session with 185.125.190.121:4460
(ntp-bootstrap.ubuntu.com) timed out
Jun 01 20:12:53 mlaptop kernel: nvme nvme0: I/O tag 324 (6144) QID 1 timeout,
completion polled
Jun 01 20:13:23 mlaptop kernel: nvme nvme0: I/O tag 325 (1145) QID 1 timeout,
completion polled
** Package changed: ubuntu => sddm (Ubuntu)
** Changed in: sddm (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/2154670
Title:
Screen freeze (3 minutes freeze when booting with external screen)
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