Created attachment 867135 [details]
error in journalctl

I use KDE as De and boot with xen (4.17.1_02).
I have some locks: my session freeze with the keyboard not more working, I can still move the mouse but no action with it.I cannot change to another terminal with alt-ctrl-F1 and I need to do a hard reset.

This occurs mainly when I try to do a "save as" operation in vim or gwenview.
In the journalctl I find errors related to nouveau driver (see attachment) 
Here my hardware info
hpprol2:~ # inxi -GaC
CPU:
  Info: model: Intel Xeon E5-2620 0 socket: LGA2011 (Proc 2) note: check
    bits: 64 type: MT SMP arch: Sandy Bridge level: v2 built: 2010-12
    process: Intel 32nm family: 6 model-id: 0x2D (45) stepping: 7
    microcode: 0x710
  Topology: cpus: 1x cores: 1 tpc: 12 threads: 12 smt: enabled cache:
    L1: 2x 64 KiB (128 KiB) desc: d-1x32 KiB; i-1x32 KiB
    L2: 2x 256 KiB (512 KiB) desc: 1x256 KiB L3: 2x 15 MiB (30 MiB)
    desc: 1x15 MiB
  Speed (MHz): avg: 1995 min/max: N/A base/boost: 2000/4800 volts: 1.4 V
    ext-clock: 200 MHz cores: 1: 1995 2: 1995 3: 1995 4: 1995 5: 1995 6: 1995
    7: 1995 8: 1995 9: 1995 10: 1995 11: 1995 12: 1995 bogomips: 47879
  Flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3
  Vulnerabilities:
  Type: itlb_multihit status: KVM: VMX unsupported
  Type: l1tf mitigation: PTE Inversion
  Type: mds status: Vulnerable: Clear CPU buffers attempted, no microcode;
    SMT Host state unknown
  Type: meltdown status: Unknown (XEN PV detected, hypervisor mitigation
    required)
  Type: mmio_stale_data status: Unknown: No mitigations
  Type: retbleed status: Not affected
  Type: spec_store_bypass status: Vulnerable
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: Retpolines, STIBP: disabled, RSB filling,
    PBRSB-eIBRS: Not affected
  Type: srbds status: Not affected
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: NVIDIA GK104GL [Quadro K4200] driver: nouveau v: kernel non-free:
    series: 470.xx+ status: legacy-active (EOL~2023/24) arch: Kepler code: GKxxx
    process: TSMC 28nm built: 2012-18 pcie: gen: 2 speed: 5 GT/s lanes: 16
    ports: active: DP-1,DVI-I-1 empty: DP-2 bus-ID: 0a:00.0 chip-ID: 10de:11b4
    class-ID: 0300 temp: 54.0 C
  Display: x11 server: X.Org v: 21.1.8 with: Xwayland v: 23.1.1
    compositor: kwin_x11 driver: X: loaded: modesetting unloaded: fbdev,vesa
    alternate: nouveau,nv,nvidia dri: nouveau gpu: nouveau display-ID: :0
    screens: 1
  Screen-1: 0 s-res: 3840x1080 s-dpi: 96 s-size: 1016x285mm (40.00x11.22")
    s-diag: 1055mm (41.54")
  Monitor-1: DP-1 pos: right model: Asus VG248 serial: F2LMQS017700
    built: 2015 res: 1920x1080 hz: 60 dpi: 92 gamma: 1.2
    size: 531x299mm (20.91x11.77") diag: 609mm (24") ratio: 16:9 modes:
    max: 1920x1080 min: 720x400
  Monitor-2: DVI-I-1 pos: primary,left model: Asus VG248
    serial: F5LMQS077420 built: 2015 res: 1920x1080 hz: 60 dpi: 92 gamma: 1.2
    size: 531x299mm (20.91x11.77") diag: 609mm (24") ratio: 16:9 modes:
    max: 1920x1080 min: 720x400
  API: OpenGL v: 4.3 Mesa 23.0.3 renderer: NVE4 direct-render: Yes

This problem is not present with kernel 6.2.10-1