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vms/windows: keep RDP VMs awake -- disable sleep in guest, fix the qemu global

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An idle Windows VM was suspending itself off the network after 15 min:
the Balanced power plan sleeps on idle, and the qemu S3/S4 disable was a
no-op -- `-global ICH9-LMB.disable_s3` is the wrong device class (q35's
bridge is ICH9-LPC), which qemu rejected as "invalid class name", so the
sleep states stayed on offer.

Fix both ends: correct the global to ICH9-LPC so the firmware stops
advertising S3/S4, and in post-oobe (any enableRDP image) switch to the
High Performance scheme, zero the standby/hibernate/monitor idle timeouts
and turn hibernate off -- a machine exposed as a service must not sleep.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117qMyjpuXsjpVAcpJbFD8g
This commit is contained in:
Git Sagar 2026-09-18 10:39:49 -03:00
parent 1510b6c5ff
commit b7838f5501
2 changed files with 15 additions and 2 deletions
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10
lib/images/windows/templates/generalize.nix
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@ -544,6 +544,16 @@ in
reg add "HKLM\SYSTEM\CurrentControlSet\Services\SessionEnv" /v Start /t REG_DWORD /d 2 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Services\UmRdpService" /v Start /t REG_DWORD /d 2 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Services\TermService" /v Start /t REG_DWORD /d 2 /f
:: A VM reached over RDP must never suspend itself off the network. The
:: default Balanced plan sleeps after 15 min idle; switch to High
:: Performance and zero every idle timeout, and turn hibernate off.
powercfg /setactive SCHEME_MIN
powercfg /change standby-timeout-ac 0
powercfg /change standby-timeout-dc 0
powercfg /change hibernate-timeout-ac 0
powercfg /change hibernate-timeout-dc 0
powercfg /change monitor-timeout-ac 0
powercfg /hibernate off
''}
${lib.optionalString (staticIP != null || configMedium) ''