It might be a combination...
I have coredump of xfce4-session and light-locker.
Also have strange new ACPI errors:
Dec 22 09:35:53 Jammin1 kernel: ACPI Error: [_SB_.PCI0.RP05.PXSX] Namespace lookup failure, AE_NOT_FOUND (20170728/dswload2-191)
Dec 22 09:35:53 Jammin1 kernel: ACPI Exception: AE_NOT_FOUND, During name lookup/catalog (20170728/psobject-252)
Dec 22 09:35:53 Jammin1 kernel: ACPI Error: Method parse/execution failed \_SB.PCI0.RP04.PXSX, AE_NOT_FOUND (20170728/psparse-550)
Dec 22 09:35:53 Jammin1 kernel: ACPI Error: [_SB_.PCI0.RP09.PXSX] Namespace lookup failure, AE_NOT_FOUND (20170728/dswload2-191)
Dec 22 09:35:53 Jammin1 kernel: ACPI Exception: AE_NOT_FOUND, During name lookup/catalog (20170728/psobject-252)
Dec 22 09:35:53 Jammin1 kernel: ACPI Error: Method parse/execution failed \_SB.PCI0.RP08.PXSX, AE_NOT_FOUND (20170728/psparse-550)
Something going on with mdadm:
Dec 22 09:35:53 Jammin1 [407]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sdb5 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [335]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sda5 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [367]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sdb4 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [402]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sdb3 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [378]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sdb6 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [388]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sda2 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [382]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sda6 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [351]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sda4 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [357]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sdb2 --offroot ${DEVLINKS}': Input/output error
Dec 22 09:35:53 Jammin1 [448]: Failed to wait spawned command '/usr/bin/mdadm --incremental --export /dev/sda3 --offroot ${DEVLINKS}': Input/output error
And, a couple of other random entries:
Dec 22 09:35:53 Jammin1 kernel: amdgpu 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
Dec 22 09:35:53 Jammin1 kernel: (NULL device *): hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().
I also downgraded everything (systemd and linux-firmware) and all is well again.