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I took a look today. I got lost but here where I endup:
Run an instance:

qemu-system-x86_64 \                                                                                                                                                                                                                               
  -enable-kvm \
  -cdrom t/data/Core-7.2.iso \       
  -m 1024 \
  -cpu host \
  -smp 2 \
  -serial stdio \
  -qmp tcp:0:4444,server,nowait

in another console I get qmp and run the following(included the output:

nc localhost 4444                                                                                                                                                                                                                        SIGINT(2) ↵  451  17:37:58   
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 2, "major": 9}, "package": "openSUSE Tumbleweed"}, "capabilities": ["oob"]}}
{"execute": "qmp_capabilities"}
{"return": {}}
{"execute": "query-status"}
{"return": {"status": "running", "running": true}}
{ "execute": "send-key",
     "arguments": { "keys": [ { "type": "qcode", "data": "ctrl" },
                              { "type": "qcode", "data": "alt" },
                              { "type": "qcode", "data": "delete" } ] } }
{"return": {}}
{"timestamp": {"seconds": 1738601139, "microseconds": 880024}, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
{"timestamp": {"seconds": 1738601139, "microseconds": 885425}, "event": "RESET", "data": {"guest": true, "reason": "guest-reset"}}
#VM gets boot console
{"execute": "query-status"}
{"return": {"status": "running", "running": true}}
# and after a while boots again

Then I found I can get the available commands[0].

{ "execute": "query-commands" }
{"return": [{"name": "device_add"}, {"name": "cxl-release-dynamic-capacity"}, {"name": "cxl-add-dynamic-capacity"}, {"name": "cxl-inject-correctable-error"}, {"name": "cxl-inject-uncorrectable-errors"}, {"name": "cxl-inject-poison"}, {"name": "cxl-inject-memory-module-event"}, {"name": "cxl-inject-dram-event"}, {"name": "cxl-inject-general-media-event"}, {"name": "query-cryptodev"}, {"name": "x-query-virtio-queue-element"}, {"name": "x-query-virtio-vhost-queue-status"}, {"name": "x-query-virtio-queue-status"}, {"name": "x-query-virtio-status"}, {"name": "x-query-virtio"}, {"name": "query-stats-schemas"}, {"name": "query-stats"}, {"name": "query-pci"}, {"name": "query-acpi-ospm-status"}, {"name": "query-audiodevs"}, {"name": "xen-event-inject"}, {"name": "xen-event-list"}, {"name": "query-sgx-capabilities"}, {"name": "query-sgx"}, {"name": "query-sev-attestation-report"}, {"name": "sev-inject-launch-secret"}, {"name": "query-sev-capabilities"}, {"name": "query-sev-launch-measure"}, {"name": "query-sev"}, {"name": "rtc-reset-reinjection"}, {"name": "query-command-line-options"}, {"name": "query-fdsets"}, {"name": "remove-fd"}, {"name": "add-fd"}, {"name": "closefd"}, {"name": "getfd"}, {"name": "human-monitor-command"}, {"name": "x-exit-preconfig"}, {"name": "cont"}, {"name": "stop"}, {"name": "query-iothreads"}, {"name": "query-name"}, {"name": "add_client"}, {"name": "query-yank"}, {"name": "yank"}, {"name": "replay-seek"}, {"name": "replay-delete-break"}, {"name": "replay-break"}, {"name": "query-replay"}, {"name": "query-cpu-definitions"}, {"name": "query-cpu-model-expansion"}, {"name": "x-query-interrupt-controllers"}, {"name": "dumpdtb"}, {"name": "x-query-usb"}, {"name": "x-query-roms"}, {"name": "x-query-ramblock"}, {"name": "x-query-opcount"}, {"name": "x-query-numa"}, {"name": "x-query-jit"}, {"name": "x-query-irq"}, {"name": "query-memory-devices"}, {"name": "query-memory-size-summary"}, {"name": "query-hv-balloon-status-report"}, {"name": "query-balloon"}, {"name": "balloon"}, {"name": "set-numa-node"}, {"name": "query-hotpluggable-cpus"}, {"name": "query-memdev"}, {"name": "pmemsave"}, {"name": "memsave"}, {"name": "query-kvm"}, {"name": "inject-nmi"}, {"name": "system_wakeup"}, {"name": "system_powerdown"}, {"name": "system_reset"}, {"name": "query-vm-generation-id"}, {"name": "query-uuid"}, {"name": "query-target"}, {"name": "query-current-machine"}, {"name": "query-machines"}, {"name": "query-cpus-fast"}, {"name": "device-sync-config"}, {"name": "device_del"}, {"name": "device-list-properties"}, {"name": "object-del"}, {"name": "object-add"}, {"name": "qom-list-properties"}, {"name": "qom-list-types"}, {"name": "qom-set"}, {"name": "qom-get"}, {"name": "qom-list"}, {"name": "query-qmp-schema"}, {"name": "quit"}, {"name": "query-commands"}, {"name": "query-version"}, {"name": "qmp_capabilities"}, {"name": "trace-event-set-state"}, {"name": "trace-event-get-state"}, {"name": "transaction"}, {"name": "snapshot-delete"}, {"name": "snapshot-load"}, {"name": "snapshot-save"}, {"name": "query-migrationthreads"}, {"name": "query-vcpu-dirty-limit"}, {"name": "cancel-vcpu-dirty-limit"}, {"name": "set-vcpu-dirty-limit"}, {"name": "query-dirty-rate"}, {"name": "calc-dirty-rate"}, {"name": "migrate-pause"}, {"name": "migrate-recover"}, {"name": "query-colo-status"}, {"name": "xen-colo-do-checkpoint"}, {"name": "query-xen-replication-status"}, {"name": "xen-set-replication"}, {"name": "xen-load-devices-state"}, {"name": "xen-set-global-dirty-log"}, {"name": "xen-save-devices-state"}, {"name": "migrate-incoming"}, {"name": "migrate"}, {"name": "migrate-continue"}, {"name": "migrate_cancel"}, {"name": "x-colo-lost-heartbeat"}, {"name": "migrate-start-postcopy"}, {"name": "query-migrate-parameters"}, {"name": "migrate-set-parameters"}, {"name": "query-migrate-capabilities"}, {"name": "migrate-set-capabilities"}, {"name": "query-migrate"}, {"name": "client_migrate_info"}, {"name": "display-update"}, {"name": "display-reload"}, {"name": "query-display-options"}, {"name": "input-send-event"}, {"name": "send-key"}, {"name": "query-mice"}, {"name": "change-vnc-password"}, {"name": "query-vnc-servers"}, {"name": "query-vnc"}, {"name": "query-spice"}, {"name": "screendump"}, {"name": "expire_password"}, {"name": "set_password"}, {"name": "query-tpm"}, {"name": "query-tpm-types"}, {"name": "query-tpm-models"}, {"name": "query-rocker-of-dpa-groups"}, {"name": "query-rocker-of-dpa-flows"}, {"name": "query-rocker-ports"}, {"name": "query-rocker"}, {"name": "request-ebpf"}, {"name": "announce-self"}, {"name": "query-rx-filter"}, {"name": "netdev_del"}, {"name": "netdev_add"}, {"name": "set_link"}, {"name": "query-dump-guest-memory-capability"}, {"name": "query-dump"}, {"name": "dump-guest-memory"}, {"name": "chardev-send-break"}, {"name": "chardev-remove"}, {"name": "chardev-change"}, {"name": "chardev-add"}, {"name": "ringbuf-read"}, {"name": "ringbuf-write"}, {"name": "query-chardev-backends"}, {"name": "query-chardev"}, {"name": "query-block-exports"}, {"name": "block-export-del"}, {"name": "block-export-add"}, {"name": "nbd-server-stop"}, {"name": "nbd-server-remove"}, {"name": "nbd-server-add"}, {"name": "nbd-server-start"}, {"name": "blockdev-snapshot-delete-internal-sync"}, {"name": "blockdev-snapshot-internal-sync"}, {"name": "x-blockdev-set-iothread"}, {"name": "x-blockdev-change"}, {"name": "block-set-write-threshold"}, {"name": "x-blockdev-amend"}, {"name": "blockdev-create"}, {"name": "blockdev-del"}, {"name": "blockdev-reopen"}, {"name": "blockdev-add"}, {"name": "block-job-change"}, {"name": "block-job-finalize"}, {"name": "block-job-dismiss"}, {"name": "block-job-complete"}, {"name": "block-job-resume"}, {"name": "block-job-pause"}, {"name": "block-job-cancel"}, {"name": "block-job-set-speed"}, {"name": "block-stream"}, {"name": "blockdev-mirror"}, {"name": "x-debug-block-dirty-bitmap-sha256"}, {"name": "block-dirty-bitmap-merge"}, {"name": "block-dirty-bitmap-disable"}, {"name": "block-dirty-bitmap-enable"}, {"name": "block-dirty-bitmap-clear"}, {"name": "block-dirty-bitmap-remove"}, {"name": "block-dirty-bitmap-add"}, {"name": "drive-mirror"}, {"name": "x-debug-query-block-graph"}, {"name": "query-named-block-nodes"}, {"name": "blockdev-backup"}, {"name": "drive-backup"}, {"name": "block-commit"}, {"name": "change-backing-file"}, {"name": "blockdev-snapshot"}, {"name": "blockdev-snapshot-sync"}, {"name": "block_resize"}, {"name": "query-block-jobs"}, {"name": "query-blockstats"}, {"name": "query-block"}, {"name": "block-latency-histogram-set"}, {"name": "block_set_io_throttle"}, {"name": "blockdev-change-medium"}, {"name": "blockdev-insert-medium"}, {"name": "blockdev-remove-medium"}, {"name": "blockdev-close-tray"}, {"name": "blockdev-open-tray"}, {"name": "eject"}, {"name": "query-pr-managers"}, {"name": "query-jobs"}, {"name": "job-finalize"}, {"name": "job-dismiss"}, {"name": "job-complete"}, {"name": "job-cancel"}, {"name": "job-resume"}, {"name": "job-pause"}, {"name": "set-action"}, {"name": "watchdog-set-action"}, {"name": "query-status"}]}

If you grep the list I see only "system_powerdown", so i run that

{ "execute": "system_powerdown" }
{"timestamp": {"seconds": 1738601890, "microseconds": 906745}, "event": "POWERDOWN"}
{"return": {}}

Nothing seems to be happening...

[0] https://qemu-project.gitlab.io/qemu/interop/qemu-qmp-ref.html#qapidoc-1673

no progress so far. I didnt spend much time today with it. I tried to run the same flow as yesterday with a tumbleweed iso. I didnt see power do what it was expecting. no sure if I did something wrong. I wonder if I should copy the qemu cmd from the CI.

During those experiments I tried to send input-send-event in various ways. I havent still made it work. I send it with missing parameters or something.

So the question I have now is whether consider to remove the implementation means delete the power sub!!

ybonatakis wrote in #note-11:

[…]
So the question I have now is whether consider to remove the implementation means delete the power sub!!

no, just the method. But I am not yet convinced that we can't get it to work

As discussed in the unblock use power('off') in t/data/tests/tests/shutdown.pm instead of sudo poweroff and run t/99-full-stack.t to reproduce the log content shown in the ticket description. Then follow the suggestion to handle the non-existant pipe gracefully.

https://github.com/os-autoinst/os-autoinst/pull/2646

okurz wrote in #note-14:

As discussed in the unblock use power('off') in t/data/tests/tests/shutdown.pm instead of sudo poweroff and run t/99-full-stack.t to reproduce the log content shown in the ticket description. Then follow the suggestion to handle the non-existant pipe gracefully.

I need to "study" the pipe's handling.

In the meantime I created a PR to reproduce the error as it was not visible locally. but it seems that it came up -> https://github.com/osh-autoinst/os-autoinst/pull/2646

However, back on my WS I can trigger a restart with the following QMP

{ "execute": "input-send-event",
      "arguments": { "events": [
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "ctrl" } } },
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "alt" } } },
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "delete" } } } ] } }
{"return": {}}

This is given exactly as it found in the docs but I think you guys tried this before. would this work in place of off?
after the system shuts down the boot reappears and then boots again tho.

I tried also this which doesnt work

{                                                                                                                                                                                                                                                                             
  "execute": "input-send-event",                                                                                                                                                                                                                                              
  "arguments": {                                                                                                                                                                                                                                                              
    "events": [                                                                                                                                                                                                                                                               
      {                                                                                                                                                                                                                                                                       
        "type": "key",                                                                                                                                                                                                                                                        
        "data": {                                                                                                                                                                                                                                                             
          "key": {"type": "qcode", "data": "power" },                                                                                                                                                                                                                          
          "down": true                                                                                                                                                                                                                                                        
        }                                                                                                                                                                                                                                                                     
      },                                                                                                                                                                                                                                                                      
      {                                                                                                                                                                                                                                                                       
        "type": "key",                                                                                                                                                                                                                                                        
        "data": {                                                                                                                                                                                                                                                             
          "key": {"type": "qcode", "data": "power" },                                                                                                                                                                                                                          
          "down": false } } ]}}
{"return": {}}

ybonatakis wrote in #note-16:

okurz wrote in #note-14:

As discussed in the unblock use power('off') in t/data/tests/tests/shutdown.pm instead of sudo poweroff and run t/99-full-stack.t to reproduce the log content shown in the ticket description. Then follow the suggestion to handle the non-existant pipe gracefully.

I need to "study" the pipe's handling.

In the meantime I created a PR to reproduce the error as it was not visible locally. but it seems that it came up -> https://github.com/osh-autoinst/os-autoinst/pull/2646

However, back on my WS I can trigger a restart with the following QMP

{ "execute": "input-send-event",
      "arguments": { "events": [
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "ctrl" } } },
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "alt" } } },
         { "type": "key", "data" : { "down": true,
           "key": {"type": "qcode", "data": "delete" } } } ] } }
{"return": {}}

I applied this in the power{'off} and ends with https://github.com/os-autoinst/os-autoinst/actions/runs/13164189124/job/36740193329?pr=2646

This is given exactly as it found in the docs but I think you guys tried this before. would this work in place of off?
after the system shuts down the boot reappears and then boots again tho.

My approach: https://github.com/os-autoinst/os-autoinst/pull/2649