KDE Plasma desktop not showing up after login from SDDM

[Austin]

KDE Plasma desktop not showing up after login from SDDM, after a new update.
It stays forever on a blank, grey loading screen.
It has been a few days now, and I was expecting an update would solve the issue.
But it never did, and I have been stuck on the last stable snapshot ever since.

Please have a look at these errors and diagnostics from the new updated snapshot:

> sudo garuda-inxi

System:
  Kernel: 6.17.4-4-cachyos arch: x86_64 bits: 64 compiler: clang v: 21.1.3 clocksource: tsc
    avail: hpet,acpi_pm parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-cachyos
    root=/dev/mapper/Linux-Root rw rootflags=subvol=@
    vt.default_red=30,243,166,249,137,245,148,186,88,243,166,249,137,245,148,166
    vt.default_grn=30,139,227,226,180,194,226,194,91,139,227,226,180,194,226,173
    vt.default_blu=46,168,161,175,250,231,213,222,112,168,161,175,250,231,213,200 quiet
    loglevel=3 mitigations=off amdgpu.ppfeaturemask=0xffffffff
  Console: tty 3 DM: SDDM Distro: Garuda base: Arch Linux
Machine:
  Type: Laptop System: HP product: HP ProBook 445 14 inch G10 Notebook PC v: SBKPF,SBKPFV2
    serial: <superuser required> Chassis: type: 10 serial: <superuser required>
  Mobo: HP model: 8B5C v: KBC Version 53.33.00 serial: <superuser required> part-nu: B1RB5PC#ACJ
    uuid: <superuser required> UEFI: HP v: 78 Ver. 01.09.00 date: 01/14/2025
Battery:
  ID-1: BAT0 charge: 28.5 Wh (63.4%) condition: 45/51.3 Wh (87.7%) power: 34.9 W volts: 12.64
    min: 11.58 model: Hewlett-Packard Primary type: Li-ion serial: <filter> charging:
    status: charging cycles: 279
CPU:
  Info: model: AMD Ryzen 5 7530U with Radeon Graphics bits: 64 type: MT MCP arch: Zen 3 gen: 3
    level: v3 note: check built: 2021-22 process: TSMC n7 (7nm) family: 0x19 (25)
    model-id: 0x50 (80) stepping: 0 microcode: 0xA500012
  Topology: cpus: 1x dies: 1 clusters: 1 cores: 6 threads: 12 tpc: 2 smt: enabled cache:
    L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 3 MiB desc: 6x512 KiB L3: 16 MiB desc: 1x16 MiB
  Speed (MHz): avg: 411 min/max: 411/2000 boost: enabled scaling: driver: amd-pstate-epp
    governor: powersave cores: 1: 411 2: 411 3: 411 4: 411 5: 411 6: 411 7: 411 8: 411 9: 411
    10: 411 11: 411 12: 411 bogomips: 47908
  Flags-basic: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
  Vulnerabilities: <filter>
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Barcelo vendor: Hewlett-Packard driver: amdgpu
    v: kernel arch: GCN-5 code: Vega process: GF 14nm built: 2017-20 pcie: gen: 3 speed: 8 GT/s
    lanes: 16 ports: active: eDP-1 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 04:00.0 chip-ID: 1002:15e7
    class-ID: 0300 temp: 42.0 C
  Device-2: Cheng Uei Precision Industry (Foxlink) HP HD Camera driver: uvcvideo type: USB
    rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-4:2 chip-ID: 05c8:0b06 class-ID: fe01
    serial: <filter>
  Display: unspecified server: X.org v: 1.21.1.18 with: Xwayland v: 24.1.8 driver: X:
    loaded: amdgpu unloaded: modesetting alternate: fbdev,vesa dri: radeonsi gpu: amdgpu tty: 192x54
  Monitor-1: eDP-1 model: LG Display 0x0725 built: 2021 res: 1920x1080 dpi: 158 gamma: 1.2
    size: 309x174mm (12.17x6.85") diag: 355mm (14") ratio: 16:9 modes: max: 1920x1080 min: 640x480
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi device: 1 drv: swrast
    gbm: drv: kms_swrast surfaceless: drv: radeonsi inactive: wayland,x11
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: mesa v: 25.2.5-cachyos1.5 note: console (EGL sourced)
    renderer: llvmpipe (LLVM 21.1.3 256 bits), AMD Radeon Graphics (radeonsi renoir ACO DRM 3.64
    6.17.4-4-cachyos)
  API: Vulkan v: 1.4.328 layers: 12 device: 0 type: integrated-gpu name: AMD Radeon Graphics
    (RADV RENOIR) driver: mesa radv v: 25.2.5-cachyos1.5 device-ID: 1002:15e7 surfaces: N/A
    device: 1 type: cpu name: llvmpipe (LLVM 21.1.3 256 bits) driver: mesa llvmpipe
    v: 25.2.5-cachyos1.5 (LLVM 21.1.3) device-ID: 10005:0000 surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo de: kscreen-console,kscreen-doctor
    gpu: corectrl,lact wl: wayland-info x11: xdpyinfo, xprop, xrandr
Audio:
  Device-1: Advanced Micro Devices [AMD/ATI] Renoir/Cezanne HDMI/DP Audio driver: snd_hda_intel
    v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 04:00.1 chip-ID: 1002:1637 class-ID: 0403
  Device-2: Advanced Micro Devices [AMD] Audio Coprocessor vendor: Hewlett-Packard driver: N/A
    alternate: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, snd_pci_acp6x, snd_acp_pci,
    snd_rpl_pci_acp6x, snd_pci_ps, snd_sof_amd_renoir, snd_sof_amd_rembrandt,
    snd_sof_amd_vangogh, snd_sof_amd_acp63, snd_sof_amd_acp70 pcie: gen: 3 speed: 8 GT/s lanes: 16
    bus-ID: 04:00.5 chip-ID: 1022:15e2 class-ID: 0480
  Device-3: Advanced Micro Devices [AMD] Family 17h/19h/1ah HD Audio vendor: Hewlett-Packard
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 04:00.6
    chip-ID: 1022:15e3 class-ID: 0403
  API: ALSA v: k6.17.4-4-cachyos status: kernel-api tools: N/A
  Server-1: PipeWire v: 1.4.9 status: active with: 1: pipewire-pulse status: off 2: wireplumber
    status: active 3: pipewire-alsa type: plugin 4: pw-jack type: plugin
    tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet vendor: Hewlett-Packard
    driver: r8169 v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: 3000 bus-ID: 01:00.0
    chip-ID: 10ec:8168 class-ID: 0200
  IF: enp1s0 state: down mac: <filter>
  Device-2: Realtek RTL8852CE PCIe 802.11ax Wireless Network vendor: Hewlett-Packard
    driver: rtw89_8852ce v: kernel pcie: gen: 2 speed: 5 GT/s lanes: 1 port: 2000 bus-ID: 02:00.0
    chip-ID: 10ec:c852 class-ID: 0280
  IF: wlp2s0 state: down mac: <filter>
  Info: services: NetworkManager, smbd, systemd-timesyncd, wpa_supplicant
Bluetooth:
  Device-1: Realtek Bluetooth Radio driver: btusb v: 0.8 type: USB rev: 1.0 speed: 12 Mb/s
    lanes: 1 mode: 1.1 bus-ID: 1-3:3 chip-ID: 0bda:c85c class-ID: e001 serial: <filter>
  Report: btmgmt ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.3 lmp-v: 12 status:
    discoverable: no pairing: no class-ID: 6c010c
Drives:
  Local Storage: total: 476.94 GiB used: 184.21 GiB (38.6%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Micron model: MTFDKBA512QFM-1BD1AABHA
    size: 476.94 GiB block-size: physical: 512 B logical: 512 B speed: 63.2 Gb/s lanes: 4 tech: SSD
    serial: <filter> fw-rev: HPSQ041 temp: 35.9 C scheme: GPT
Partition:
  ID-1: / raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs dev: /dev/dm-0
    maj-min: 253:0 mapped: Linux-Root
  ID-2: /boot/efi raw-size: 384 MiB size: 383.2 MiB (99.80%) used: 41.2 MiB (10.7%) fs: vfat
    dev: /dev/nvme0n1p2 maj-min: 259:2
  ID-3: /home raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
  ID-4: /var/log raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
  ID-5: /var/tmp raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
Swap:
  Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default) zswap: no
  ID-1: swap-1 type: zram size: 14.93 GiB used: 0 KiB (0.0%) priority: 100 comp: zstd
    avail: lzo-rle,lzo,lz4,lz4hc,deflate,842 dev: /dev/zram0
Sensors:
  System Temperatures: cpu: 42.8 C mobo: N/A gpu: amdgpu temp: 41.0 C
  Fan Speeds (rpm): N/A
Info:
  Memory: total: 16 GiB note: est. available: 14.93 GiB used: 1.28 GiB (8.6%)
  Processes: 317 Power: uptime: 8m states: freeze,mem,disk suspend: s2idle wakeups: 0
    hibernate: platform avail: shutdown, reboot, suspend, test_resume image: 5.93 GiB
    services: power-profiles-daemon,upowerd Init: systemd v: 258 default: graphical
    tool: systemctl
  Packages: 1697 pm: pacman pkgs: 1668 libs: 382 tools: octopi,paru,yay pm: flatpak pkgs: 29
    Compilers: clang: 21.1.3 gcc: 15.2.1 Shell: Bash v: 5.3.3 running-in: tty 3 inxi: 3.3.39
Garuda (2.11.1-1):
  System install date:     2025-03-29
  Garuda release:          250308
  Last full system update: 2025-10-24
  Is partially upgraded:   No
  Relevant software:       snapper NetworkManager dracut garuda-hardware-profile-standard garuda-hardware-profile-standard-x11
  Windows dual boot:       Probably (Run as root to verify)
  Failed units:            nmb.service 
--- System Health Check Report ---
23/24 checks run in 1.39 seconds ⌛
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--- LOW ---
 - Failed systemd services found: nmb.service
System:
  Kernel: 6.17.4-4-cachyos arch: x86_64 bits: 64 compiler: clang v: 21.1.3 clocksource: tsc
    avail: hpet,acpi_pm parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-cachyos
    root=/dev/mapper/Linux-Root rw rootflags=subvol=@
    vt.default_red=30,243,166,249,137,245,148,186,88,243,166,249,137,245,148,166
    vt.default_grn=30,139,227,226,180,194,226,194,91,139,227,226,180,194,226,173
    vt.default_blu=46,168,161,175,250,231,213,222,112,168,161,175,250,231,213,200 quiet
    loglevel=3 mitigations=off amdgpu.ppfeaturemask=0xffffffff
  Console: pty pts/0 DM: SDDM Distro: Garuda base: Arch Linux
Machine:
  Type: Laptop System: HP product: HP ProBook 445 14 inch G10 Notebook PC v: SBKPF,SBKPFV2
    serial: <filter> Chassis: type: 10 serial: <filter>
  Mobo: HP model: 8B5C v: KBC Version 53.33.00 serial: <filter> part-nu: B1RB5PC#ACJ
    uuid: fec98d08-0d24-4247-9e6f-f257a47fd51c UEFI: HP v: 78 Ver. 01.09.00 date: 01/14/2025
Battery:
  ID-1: BAT0 charge: 30.3 Wh (67.4%) condition: 45/51.3 Wh (87.7%) power: 35 W volts: 12.72
    min: 11.58 model: Hewlett-Packard Primary type: Li-ion serial: <filter> charging:
    status: charging cycles: 279
CPU:
  Info: model: AMD Ryzen 5 7530U with Radeon Graphics socket: FP6 bits: 64 type: MT MCP
    arch: Zen 3 gen: 3 level: v3 note: check built: 2021-22 process: TSMC n7 (7nm) family: 0x19 (25)
    model-id: 0x50 (80) stepping: 0 microcode: 0xA500012
  Topology: cpus: 1x dies: 1 clusters: 1 cores: 6 threads: 12 tpc: 2 smt: enabled cache:
    L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 3 MiB desc: 6x512 KiB L3: 16 MiB desc: 1x16 MiB
  Speed (MHz): avg: 411 min/max: 411/2000 boost: enabled base/boost: 2000/4550 scaling:
    driver: amd-pstate-epp governor: powersave volts: 1.2 V ext-clock: 100 MHz cores: 1: 411 2: 411
    3: 411 4: 411 5: 411 6: 411 7: 411 8: 411 9: 411 10: 411 11: 411 12: 411 bogomips: 47908
  Flags-basic: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
  Vulnerabilities: <filter>
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Barcelo vendor: Hewlett-Packard driver: amdgpu
    v: kernel arch: GCN-5 code: Vega process: GF 14nm built: 2017-20 pcie: gen: 3 speed: 8 GT/s
    lanes: 16 ports: active: eDP-1 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 04:00.0 chip-ID: 1002:15e7
    class-ID: 0300 temp: 41.0 C
  Device-2: Cheng Uei Precision Industry (Foxlink) HP HD Camera driver: uvcvideo type: USB
    rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-4:2 chip-ID: 05c8:0b06 class-ID: fe01
    serial: <filter>
  Display: unspecified server: X.org v: 1.21.1.18 with: Xwayland v: 24.1.8 driver: X:
    loaded: amdgpu unloaded: modesetting alternate: fbdev,vesa dri: radeonsi gpu: amdgpu tty: 192x54
  Monitor-1: eDP-1 model: LG Display 0x0725 built: 2021 res: 1920x1080 dpi: 158 gamma: 1.2
    size: 309x174mm (12.17x6.85") diag: 355mm (14") ratio: 16:9 modes: max: 1920x1080 min: 640x480
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi device: 1 drv: swrast
    gbm: drv: radeonsi surfaceless: drv: radeonsi inactive: wayland,x11
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: mesa v: 25.2.5-cachyos1.5 note: console (EGL sourced)
    renderer: AMD Radeon Graphics (radeonsi renoir ACO DRM 3.64 6.17.4-4-cachyos), llvmpipe (LLVM
    21.1.3 256 bits)
  API: Vulkan v: 1.4.328 layers: 8 device: 0 type: integrated-gpu name: AMD Radeon Graphics
    (RADV RENOIR) driver: mesa radv v: 25.2.5-cachyos1.5 device-ID: 1002:15e7 surfaces: N/A
    device: 1 type: cpu name: llvmpipe (LLVM 21.1.3 256 bits) driver: mesa llvmpipe
    v: 25.2.5-cachyos1.5 (LLVM 21.1.3) device-ID: 10005:0000 surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo de: kscreen-console,kscreen-doctor
    gpu: corectrl,lact wl: wayland-info x11: xdpyinfo, xprop, xrandr
Audio:
  Device-1: Advanced Micro Devices [AMD/ATI] Renoir/Cezanne HDMI/DP Audio driver: snd_hda_intel
    v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 04:00.1 chip-ID: 1002:1637 class-ID: 0403
  Device-2: Advanced Micro Devices [AMD] Audio Coprocessor vendor: Hewlett-Packard driver: N/A
    alternate: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, snd_pci_acp6x, snd_acp_pci,
    snd_rpl_pci_acp6x, snd_pci_ps, snd_sof_amd_renoir, snd_sof_amd_rembrandt,
    snd_sof_amd_vangogh, snd_sof_amd_acp63, snd_sof_amd_acp70 pcie: gen: 3 speed: 8 GT/s lanes: 16
    bus-ID: 04:00.5 chip-ID: 1022:15e2 class-ID: 0480
  Device-3: Advanced Micro Devices [AMD] Family 17h/19h/1ah HD Audio vendor: Hewlett-Packard
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 04:00.6
    chip-ID: 1022:15e3 class-ID: 0403
  API: ALSA v: k6.17.4-4-cachyos status: kernel-api tools: N/A
  Server-1: PipeWire v: 1.4.9 status: n/a (root, process) with: 1: pipewire-pulse status: off
    2: wireplumber status: active 3: pipewire-alsa type: plugin 4: pw-jack type: plugin
    tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet vendor: Hewlett-Packard
    driver: r8169 v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: 3000 bus-ID: 01:00.0
    chip-ID: 10ec:8168 class-ID: 0200
  IF: enp1s0 state: down mac: <filter>
  Device-2: Realtek RTL8852CE PCIe 802.11ax Wireless Network vendor: Hewlett-Packard
    driver: rtw89_8852ce v: kernel pcie: gen: 2 speed: 5 GT/s lanes: 1 port: 2000 bus-ID: 02:00.0
    chip-ID: 10ec:c852 class-ID: 0280
  IF: wlp2s0 state: down mac: <filter>
  Info: services: NetworkManager, smbd, systemd-timesyncd, wpa_supplicant
Bluetooth:
  Device-1: Realtek Bluetooth Radio driver: btusb v: 0.8 type: USB rev: 1.0 speed: 12 Mb/s
    lanes: 1 mode: 1.1 bus-ID: 1-3:3 chip-ID: 0bda:c85c class-ID: e001 serial: <filter>
  Report: btmgmt ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.3 lmp-v: 12 status:
    discoverable: no pairing: no class-ID: 6c010c
Drives:
  Local Storage: total: 476.94 GiB used: 184.21 GiB (38.6%)
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Micron model: MTFDKBA512QFM-1BD1AABHA
    size: 476.94 GiB block-size: physical: 512 B logical: 512 B speed: 63.2 Gb/s lanes: 4 tech: SSD
    serial: <filter> fw-rev: HPSQ041 temp: 35.9 C scheme: GPT
  SMART: yes health: PASSED on: 78d 5h cycles: 18,769 read-units: 15,159,773 [7.76 TB]
    written-units: 11,615,095 [5.94 TB]
Partition:
  ID-1: / raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    block-size: 4096 B dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
  ID-2: /boot/efi raw-size: 384 MiB size: 383.2 MiB (99.80%) used: 41.2 MiB (10.7%) fs: vfat
    block-size: 512 B dev: /dev/nvme0n1p2 maj-min: 259:2
  ID-3: /home raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    block-size: 4096 B dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
  ID-4: /var/log raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    block-size: 4096 B dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
  ID-5: /var/tmp raw-size: 64 GiB size: 64 GiB (100.00%) used: 50.42 GiB (78.8%) fs: btrfs
    block-size: 4096 B dev: /dev/dm-0 maj-min: 253:0 mapped: Linux-Root
Swap:
  Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default) zswap: no
  ID-1: swap-1 type: zram size: 14.93 GiB used: 0 KiB (0.0%) priority: 100 comp: zstd
    avail: lzo-rle,lzo,lz4,lz4hc,deflate,842 dev: /dev/zram0
Sensors:
  System Temperatures: cpu: 42.1 C mobo: N/A gpu: amdgpu temp: 41.0 C
  Fan Speeds (rpm): N/A
Info:
  Memory: total: 16 GiB note: est. available: 14.93 GiB used: 1.34 GiB (9.0%)
  Processes: 314 Power: uptime: 11m states: freeze,mem,disk suspend: s2idle wakeups: 0
    hibernate: platform avail: shutdown, reboot, suspend, test_resume image: 5.93 GiB
    services: power-profiles-daemon,upowerd Init: systemd v: 258 default: graphical
    tool: systemctl
  Packages: 1697 pm: pacman pkgs: 1668 libs: 382 tools: octopi,paru,yay pm: flatpak pkgs: 29
    Compilers: clang: 21.1.3 gcc: 15.2.1 Shell: Bash (sudo) v: 5.3.3 running-in: pty pts/0
    inxi: 3.3.39
Garuda (2.11.1-1):
  System install date:     2025-03-29
  Garuda release:          250308
  Last full system update: 2025-10-24
  Is partially upgraded:   No
  Relevant software:       snapper NetworkManager dracut garuda-hardware-profile-standard garuda-hardware-profile-standard-x11
  Windows dual boot:       Yes
  Failed units:            nmb.service 
--- System Health Check Report ---
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Powered by garuda-health 🦅

--- LOW ---
 - Failed systemd services found: nmb.service

Relevant errors from the journalctl output summarised by AI:

Locale problems

• kwin_xkbcommon: XKB: [XKB-679] No Compose file for locale “en_IN.ISO8859-1”: locale is either invalid or not installed; couldn’t find a Compose file for locale “en_IN” (mapped to “en_IN.ISO8859-1”).

• xkbcommon: ERROR: [XKB-679] No Compose file for locale “en_IN.ISO8859-1”: locale is either invalid or not installed; couldn’t find a Compose file for locale “en_IN” (mapped to “en_IN.ISO8859-1”).

KWin Wayland failing to open DRM

• kwin_wayland: No backend specified, automatically choosing drm.
  ​
• kwin_wayland: Failed to open /dev/dri/card1 device (Device or resource busy). ​
• kwin_wayland: failed to open drm device at “/dev/dri/card1”.
• kwin_wayland: No suitable DRM devices have been found.
• Repeats many times with new kwin_wayland PIDs during the same login attempt.

Plasma session fallout

• ksplashqml: Could not load the Qt platform plugin “wayland” in “” even though it was found. Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vkkhrdisplay, vnc, wayland-brcm, wayland-egl, wayland, xcb..

• kcminit_startup: Could not load the Qt platform plugin “wayland” in “” even though it was found. Same plugin list printed.

• systemd --user: plasma-workspace-wayland.target: Bound to unit plasma-kwin_wayland.service, but unit isn’t active. Dependency failed for plasma-workspace-wayland.target; start failed with result ‘dependency’.

• fcitx5: Failed to open wayland connection (occurs after compositor fails).

SDDM/greeter context

• SDDM greeter starts on Wayland, then “wayland compositor finished” and the greeter restarts; later, reading and selecting /usr/share/wayland-sessions/plasma.desktop for user session on VT2.

• sddm-helper-start-wayland: “kwin_core: Failed to open /dev/dri/card1 … No suitable DRM devices have been found” during greeter cycle too.
  ​

Probable culprits:

> awk '/\[ALPM\] upgraded/{print $0} /\[ALPM\] transaction started/{block++} END{}' /var/log/pacman.log | tail -n +1

[2025-10-23T11:28:39+0530] [ALPM] upgraded spdlog (1.15.3-3.1 -> 1.16.0-1.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded ananicy-cpp (1.1.1-8.1 -> 1.1.1-9.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded bat (0.25.0-4.1 -> 0.26.0-1.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded boost-libs (1.88.0-3.1 -> 1.89.0-1.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded glycin (2.0.3-1.1 -> 2.0.4-1.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded gdk-pixbuf2 (2.44.3-1.1 -> 2.44.4-1.1)
[2025-10-23T11:28:39+0530] [ALPM] upgraded libxkbcommon (1.11.0-1.1 -> 1.12.2-1.1)
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[2025-10-23T11:28:44+0530] [ALPM] upgraded gc (8.2.8-2.1 -> 8.2.10-1.1)
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[2025-10-23T11:28:45+0530] [ALPM] upgraded imath (3.2.2-1.1 -> 3.2.2-2.1)
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[2025-10-23T11:28:57+0530] [ALPM] upgraded whois (5.6.4-1.1 -> 5.6.5-1.1)here

Thanking you in advance
Austin

[tbg]

Have you tried logging into an X11 session rather than Wayland?

[Austin]

Yup, Plasma X11 session is working.

[Austin]

Kwin_wayland fails to open /dev/dri/card0 on first login attempt, works on...

I found a similar issue here, possibly due to an Nvidia card, but I don’t have an Nvidia card. I have an integrated AMD one.
Their issue seemed to have been automatically solved with an update…

Also, booting with the LTS kernel didn’t work.
I tried skipping the vulkan-radeon package update, which didn’t work.

[tbg]

@Austin

I found a similar issue here, possibly due to an Nvidia card

Dude you made me look at the forbidden green ick.

After a quick glance (so as to not damage my eyes), it appeared that user was also using their integrated AMD card.

@Austin

Plasma X11 session is working

Unless you have a pressing need for a specific Wayland feature, why not simply use X11 temporarily. I use programs that don’t work with Wayland, so I’m sticking to using an X session for a while longer.

[Austin]

@tbg

Dude you made me look at the forbidden green ick.

@tbg

After a quick glance (so as to not damage my eyes), it appeared that user was also using their integrated AMD card.

Hmm, maybe they just concluded it wrong, blaming their Nvidia driver update…

@tbg

Unless you have a pressing need for a specific Wayland feature, why not simply use X11 temporarily. I use programs that don’t work with Wayland, so I’m sticking to using an X session for a while longer.

The experience is way inferior to X11, both aesthetically and functionally.
I would rather stay on the working stable snapshot…

I was thinking of preventing the culprit package from updating. Any idea which package might be causing it?

Thank you for your time.

[tbg]

I’m not sure what the culprit is, but both your cachyos kernels were updated. Perhaps you need to test alternate kernels such as linux , linux-lts , linux-zen , or linux-mainline.

[Austin]

I tested linux-lts along with linux-lts-headers, but still no luck. It’s the same.

[Austin]

Update:
If I log in to X11 session, log out and then log in to Wayland session, it works!
Otherwise it doesn’t…

There was a similar issue opened in our forum some time back:

Switching to Wayland: Failed to open drm device at "/dev/dri/card0"

I'm not exactly sure if you wanted an explanation answer for that probably rhetorical question, but /dev/dri/card0 is my gpu. I tried the same thing with just one screen, but it didn't help, as expected. I guess you might be interested into my package list for packages like Firejail (Don't worry, I'm trying to keep my system as clean as possible, so the list shouldn't be too big): https://termbin.com/pmlt

But UltraBlack had to reinstall his system to fix it…

Switching to Wayland: Failed to open drm device at "/dev/dri/card0"

I had the same issue. I found that disabling ananicity cpp in the garuda assistant fixed it. I have no clue why but it did. Is there someone somewhere we could report this issue to ?

This too didn’t work for me…

[Austin]

A few days ago, I discovered that the ‘guest user’ was logging in to the Wayland session without any issues!
I then narrowed down the issue to some config file in the ~/.config folder, but couldn’t figure out which config file was the culprit…

I backed up the config files and folders important to me, and then deleted the ~/.config folder, which got reset with the default config files after a reboot and solved the issue.

[tbg]

Thanks for updating everyone on your solution @Austin. Too bad you never narrowed down the config file that was causing your issue. Good stuff all the same.

[Glittermonster]

This happened to me yesterday…in my case the culprit was kwalletmanager screwing things up. I downloaded kwalletmanager (it wasn’t present on my system, but for some reason the kwallet pop-up was happening when i opened vivaldi), went to system settings and unchecked the Enable Wallet option and sddm worked like magic after a reboot. (it also fixed my vivaldi install)