Spoke to soon...
After failing to start SDDM at boot, issuing "service sddm restart" works, but it still fails at boot. Here is the failed log:
[ 3.844] (--) Log file renamed from "/var/log/Xorg.pid-1378.log" to "/var/log/Xorg.0.log"
[ 3.845]
X.Org X Server 1.21.1.7
X Protocol Version 11, Revision 0
[ 3.845] Current Operating System: Linux dell7010 6.3.4-1-siduction-amd64 #1 SMP PREEMPT_DYNAMIC siduction 6.3-4 (2023-05-25) x86_64
[ 3.845] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.3.4-1-siduction-amd64 root=UUID=d62d5ab4-1ceb-4b05-b9d3-7b9eb92feafd ro quiet resume=UUID=3e0f2e0a-58a8-4cdf-9e79-f91873584668 systemd.show_status=1
[ 3.845] xorg-server 2:21.1.7-3 (https://www.debian.org/support)
[ 3.845] Current version of pixman: 0.42.2
[ 3.845] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 3.845] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 3.845] (==) Log file: "/var/log/Xorg.0.log", Time: Sun May 28 09:33:23 2023
[ 3.846] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 3.846] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 3.847] (==) No Layout section. Using the first Screen section.
[ 3.847] (**) |-->Screen "Dell2" (0)
[ 3.847] (**) | |-->Monitor "DisplayPort-1-4"
[ 3.847] (**) | |-->Device "Card1"
[ 3.847] (**) | |-->GPUDevice "Card0"
[ 3.847] (==) Automatically adding devices
[ 3.847] (==) Automatically enabling devices
[ 3.847] (==) Automatically adding GPU devices
[ 3.847] (==) Automatically binding GPU devices
[ 3.847] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 3.848] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 3.848] Entry deleted from font path.
[ 3.850] (==) FontPath set to:
/usr/share/fonts/X11/misc,
/usr/share/fonts/X11/100dpi/:unscaled,
/usr/share/fonts/X11/75dpi/:unscaled,
/usr/share/fonts/X11/Type1,
/usr/share/fonts/X11/100dpi,
/usr/share/fonts/X11/75dpi,
built-ins
[ 3.850] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 3.850] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 3.850] (II) Loader magic: 0x55a847c6df00
[ 3.850] (II) Module ABI versions:
[ 3.850] X.Org ANSI C Emulation: 0.4
[ 3.850] X.Org Video Driver: 25.2
[ 3.850] X.Org XInput driver : 24.4
[ 3.850] X.Org Server Extension : 10.0
[ 3.850] (++) using VT number 7
[ 3.850] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[ 3.850] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 3.850] (II) Platform probe for /sys/devices/pci0000:00/0000:00:02.0/drm/card0
[ 3.852] (--) PCI: (0@0:2:0) 8086:a780:1028:0bd0 rev 4, Mem @ 0x6011000000/16777216, 0x4000000000/268435456, I/O @ 0x00004000/64
[ 3.852] (--) PCI:*(3@0:0:0) 1002:7424:1028:0040 rev 0, Mem @ 0x4100000000/2147483648, 0x4180000000/2097152, 0x70500000/1048576, I/O @ 0x00003000/256, BIOS @ 0x????????/131072
[ 3.853] (II) LoadModule: "glx"
[ 3.853] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 3.856] (II) Module glx: vendor="X.Org Foundation"
[ 3.856] compiled for 1.21.1.7, module version = 1.0.0
[ 3.856] ABI class: X.Org Server Extension, version 10.0
[ 3.856] (II) LoadModule: "amdgpu"
[ 3.856] (II) Loading /usr/lib/xorg/modules/drivers/amdgpu_drv.so
[ 3.858] (II) Module amdgpu: vendor="X.Org Foundation"
[ 3.858] compiled for 1.21.1.7, module version = 23.0.0
[ 3.858] Module class: X.Org Video Driver
[ 3.858] ABI class: X.Org Video Driver, version 25.2
[ 3.858] (II) LoadModule: "intel"
[ 3.858] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[ 3.859] (II) Module intel: vendor="X.Org Foundation"
[ 3.859] compiled for 1.21.1.3, module version = 2.99.917
[ 3.859] Module class: X.Org Video Driver
[ 3.859] ABI class: X.Org Video Driver, version 25.2
[ 3.859] (II) AMDGPU: Driver for AMD Radeon:
All GPUs supported by the amdgpu kernel driver
[ 3.859] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[ 3.859] (II) intel: Driver for Intel(R) HD Graphics
[ 3.859] (II) intel: Driver for Intel(R) Iris(TM) Graphics
[ 3.859] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
[ 3.860] (II) AMDGPU(0): [KMS] Kernel modesetting enabled.
[ 3.860] (EE) AMDGPU(0): [drm] Failed to open DRM device for pci:0000:03:00.0: Invalid argument
[ 3.860] (II) intel(G0): Using Kernel Mode Setting driver: i915, version 1.6.0 20201103
[ 3.860] (II) intel(G0): SNA compiled: xserver-xorg-video-intel 2:2.99.917+git20210115-1 (Timo Aaltonen <tjaalton@debian.org>)
[ 3.860] (II) intel(G0): SNA compiled for use with valgrind
[ 3.861] (EE) Screen 0 deleted because of no matching config section.
[ 3.861] (II) UnloadModule: "amdgpu"
[ 3.861] (EE) Device(s) detected, but none match those in the config file.
[ 3.861] (EE)
Fatal server error:
[ 3.861] (EE) no screens found(EE)
[ 3.861] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 3.861] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 3.861] (EE)
[ 3.861] (EE) Server terminated with error (1). Closing log file.
The main error seems to be
(EE) AMDGPU(0): [drm] Failed to open DRM device for pci:0000:03:00.0: Invalid argumentHere is the one after successfully restarting SDDM:
https://paste.debian.net/1281313/
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