last week I got a new PC (B550-F + Ryzen 5900X), and I installed Mint 20.2
and a bit later, after I found some "EDAC amd64: Error: F0 not found, device 0x1650 (broken BIOS?) "
in the logfiles, I installed the kernel 5.13.0-21-generic. So far, so good.
But lightdm is not working properly (neither was with the original kernel)
Problem 1: "Login Window" can be selected from the menu, but does not open any window.
Problem 2:
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sudo lightdm-settings
Especially, there is no user background, and no user list shown (as was before on my old system with Mint 20.2 !)
(Instead I have to enter user name and password)
Both /etc/lightdm/lightdm-gtk-greeter.conf as well as /etc/lightdm/slick-greeter.conf contain
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[Greeter]
draw-user-backgrounds=true
...
Problem 3: During my investigation (and with a running dbus of course), I did a
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sudo lightdm --test-mode --debug
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[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.30.0, UID=0 PID=22894
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/90-nvidia.conf
[+0.00s] DEBUG: [SeatDefaults] is now called [Seat:*], please update this configuration
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/90-slick-greeter.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /var/lib/flatpak/exports/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /root/.local/share/flatpak/exports/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/70-linuxmint.conf
[+0.00s] DEBUG: [SeatDefaults] is now called [Seat:*], please update this configuration
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ?gio-vfs?
[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] WARNING: Seat type 'xlocal' is deprecated, use 'type=local' instead
[+0.00s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.00s] DEBUG: Seat seat0: Creating display server of type x
[+0.00s] DEBUG: posix_spawn avoided (fd close requested)
[+0.00s] DEBUG: Using VT 7
[+0.00s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.00s] DEBUG: XServer 1: Logging to /var/log/lightdm/x-1.log
[+0.00s] DEBUG: XServer 1: Writing X server authority to /var/run/lightdm/root/:1
[+0.00s] DEBUG: XServer 1: Launching X Server
[+0.00s] DEBUG: Launching process 22900: /usr/bin/X -core :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt7 -novtswitch
[+0.00s] DEBUG: XServer 1: Waiting for ready signal from X server :1
[+0.00s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.01s] DEBUG: Loading users from org.freedesktop.Accounts
Failed to use bus name org.freedesktop.DisplayManager, do you have appropriate permissions?
Does anyone know how to fix these 3 issues?
PS
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dpkg-reconfigure lightdm
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inxi -Fxz
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System: Kernel: 5.13.0-21-generic x86_64 bits: 64 compiler: N/A Desktop: Xfce 4.16.0
Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal
Machine: Type: Desktop System: ASUS product: N/A v: N/A serial: N/A
Mobo: ASUSTeK model: ROG STRIX B550-F GAMING v: Rev X.0x serial: <filter>
UEFI: American Megatrends v: 2423 date: 08/10/2021
CPU: Topology: 12-Core model: AMD Ryzen 9 5900X bits: 64 type: MT MCP arch: Zen 3
L2 cache: 6144 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 177256
Speed: 2195 MHz min/max: 2200/3700 MHz Core speeds (MHz): 1: 2212 2: 2235 3: 2248
4: 2194 5: 2195 6: 2222 7: 2233 8: 2208 9: 2196 10: 2190 11: 2191 12: 2195 13: 2193
14: 2193 15: 2190 16: 2194 17: 2194 18: 2194 19: 2195 20: 2195 21: 2194 22: 2192
23: 2216 24: 2194
Graphics: Device-1: NVIDIA TU117 [GeForce GTX 1650] driver: nvidia v: 470.82.00
bus ID: 07:00.0
Display: server: X.Org 1.20.11 driver: nvidia resolution: 1920x1200~60Hz
OpenGL: renderer: NVIDIA GeForce GTX 1650/PCIe/SSE2 v: 4.6.0 NVIDIA 470.82.00
direct render: Yes
Audio: Device-1: NVIDIA driver: snd_hda_intel v: kernel bus ID: 07:00.1
Device-2: AMD Starship/Matisse HD Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel bus ID: 09:00.4
Device-3: Sennheiser Headset [PC 8] type: USB
driver: hid-generic,snd-usb-audio,usbhid bus ID: 3-1:2
Device-4: Creative Live! Cam Chat HD [VF0700] type: USB
driver: snd-usb-audio,uvcvideo bus ID: 1-9:4
Sound Server: ALSA v: k5.13.0-21-generic
Network: Device-1: Intel vendor: ASUSTeK driver: igc v: kernel port: N/A bus ID: 06:00.0
IF: enp6s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives: Local Storage: total: 8.19 TiB used: 396.75 GiB (4.7%)
ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 980 1TB size: 931.51 GiB
ID-2: /dev/sda vendor: Western Digital model: WD80EFBX-68AZZN0 size: 7.28 TiB
temp: 41 C
Partition: ID-1: / size: 613.44 GiB used: 11.83 GiB (1.9%) fs: ext4 dev: /dev/nvme0n1p6
ID-2: /boot size: 1.88 GiB used: 323.3 MiB (16.8%) fs: ext2 dev: /dev/nvme0n1p5
ID-3: /home size: 2.82 TiB used: 377.50 GiB (13.1%) fs: ext4 dev: /dev/sda6
ID-4: /var size: 93.37 GiB used: 7.08 GiB (7.6%) fs: ext4 dev: /dev/sda5
ID-5: swap-1 size: 30.52 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda4
Sensors: System Temperatures: cpu: 39.1 C mobo: N/A gpu: nvidia temp: 51 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 0%
Info: Processes: 413 Uptime: 3h 46m Memory: 31.26 GiB used: 3.52 GiB (11.3%)
Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17 inxi: 3.0.38