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When I boot into arch using the Xen hypervisor (latest version from AUR), I can no longer do an ACPI suspend with pm-suspend. The system just locks up, without even blanking the screen if X is not running, and continues to run until I manually restart it. Booting the very same arch install with the arch kernel has no problems with suspend. There doesn't seem to be anything unusual in pm-suspend.log, and I'm not sure what else I should try to troubleshoot this. The xen documentation makes it seem like suspend from a dom0 has been working for a few years.
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