[Risolto] problema spegnimento

[dxgiusti]

ho un desktop "anziano..." che però soddisfa le mie esigenze.
ho il dualboot 11 con pclinuxos e succede che ogni volta che spengo, si spegne il monitor ma la tastiera ed il resto no. devo necessariamente fermarlo tenendo premuto il tasto di accensione.
questo mi succede sia con windows che con linux, tutte le volte.

Codice:

[mario@linux-predator-g3600 ~]$ inxi -Fxx
System:
  Host: linux-predator-g3600 Kernel: 6.5.12-pclos1 arch: x86_64 bits: 64
    compiler: gcc v: 12.3.0 Desktop: MATE v: 1.26.2 wm: marco dm: 1: GDM 2: XDM
    Distro: PCLinuxOS 2023
Machine:
  Type: Desktop Mobo: Acer model: Predator G3600 serial: <superuser required>
    UEFI: American Megatrends v: P01-A3 date: 02/18/2011
CPU:
  Info: quad core model: Intel Core i7-2600 bits: 64 type: MT MCP
    arch: Sandy Bridge rev: 7 cache: L1: 256 KiB L2: 1024 KiB L3: 8 MiB
  Speed (MHz): avg: 1650 high: 1706 min/max: 1600/3800 cores: 1: 1696
    2: 1696 3: 1600 4: 1607 5: 1600 6: 1600 7: 1696 8: 1706 bogomips: 54276
  Flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: NVIDIA GF106 [GeForce GT 440] vendor: PC Partner / Sapphire
    driver: nouveau v: kernel arch: Fermi pcie: speed: 2.5 GT/s lanes: 16 ports:
    active: DVI-I-1 empty: DP-1,HDMI-A-1 bus-ID: 01:00.0 chip-ID: 10de:0dc0
    temp: 64.0 C
  Display: server: X.org v: 1.21.1.9 compositor: marco v: 1.26.2 driver: X:
    loaded: nouveau,v4l dri: nouveau gpu: nouveau display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1280x1024 s-dpi: 96
  Monitor-1: DVI-I-1 model: Samsung SyncMaster res: 1280x1024 dpi: 86
    diag: 482mm (19")
  API: OpenGL v: 4.3 vendor: mesa v: 23.2.1 glx-v: 1.4 es-v: 3.1
    direct-render: yes renderer: NVC3 device-ID: 10de:0dc0
Audio:
  Device-1: Intel 6 Series/C200 Series Family High Definition Audio
    vendor: Acer Incorporated ALI 6 driver: snd_hda_intel v: kernel
    bus-ID: 00:1b.0 chip-ID: 8086:1c20
  Device-2: NVIDIA GF106 High Definition Audio vendor: PC Partner / Sapphire
    driver: snd_hda_intel v: kernel pcie: speed: 2.5 GT/s lanes: 16
    bus-ID: 01:00.1 chip-ID: 10de:0be9
  API: ALSA v: k6.5.12-pclos1 status: kernel-api with: aoss
    type: oss-emulator
  Server-1: JACK v: 1.9.21 status: off
  Server-2: PulseAudio v: 16.1 status: active
Network:
  Device-1: Intel 82579V Gigabit Network vendor: Acer Incorporated ALI
    driver: e1000e v: kernel port: f040 bus-ID: 00:19.0 chip-ID: 8086:1503
  IF: eth0 state: up speed: 1000 Mbps duplex: full mac: f8:0f:41:15:54:6f
  Device-2: Ralink RT3090 Wireless 802.11n 1T/1R PCIe vendor: Lite-On
    driver: rt2800pci v: 2.3.0 pcie: speed: 2.5 GT/s lanes: 1 bus-ID: 03:00.0
    chip-ID: 1814:3090
  IF: wlan0 state: down mac: 68:a3:c4:6f:cf:2e
Drives:
  Local Storage: total: 698.65 GiB used: 160.66 GiB (23.0%)
  ID-1: /dev/sda vendor: Seagate model: WDC WDS250G1B0A-00H9H0
    size: 232.89 GiB speed: 6.0 Gb/s serial: 171024802168
  ID-2: /dev/sdb vendor: Seagate model: ST500DM002-1BD142 size: 465.76 GiB
    speed: 6.0 Gb/s serial: W2AEML5W
Partition:
  ID-1: / size: 69.86 GiB used: 8.61 GiB (12.3%) fs: ext4 dev: /dev/sda5
Swap:
  ID-1: swap-1 type: partition size: 4 GiB used: 0 KiB (0.0%) priority: -2
    dev: /dev/sda6
Sensors:
  Src: /sys System Temperatures: cpu: 37.0 C mobo: N/A gpu: nouveau
    temp: 64.0 C
  Fan Speeds (rpm): N/A
Info:
  Processes: 291 Uptime: 2h 17m Memory: total: N/A available: 7.75 GiB
  used: 1.35 GiB (17.4%) Init: SysVinit v: 3.08 runlevel: 5 default: 5
  Compilers: gcc: 12.3.0 clang: 15.0.6 Packages: pm: rpm pkgs: N/A
  note: see --rpm Shell: Bash v: 5.2.21 running-in: mate-terminal inxi: 3.3.31
[mario@linux-predator-g3600 ~]$

questa anomalia dura da circa una settimana in concomitanza con la trasformazione del disco del sistema da Legacy a EFI.
nel bios non ho toccato nessuna impostazione tranne l'ordine di boot dove ho impostato (ovviamente) EFI come prima scelta.
immagino sia un problema hardware ma proprio non ho idea di cosa.
dite che devo mettere mano al portafoglio?