I have a linux client with ADLAgent 2.6-74 (not LinuxPE), Deployment Server 6.9 SP3, client is a VMWare VM.
If I right-click on the active computer and select power-control -> Restart, it will do that just fine.
If I have a job with a reboot task, it will reboot just fine. But the task remains in 'restarting computer...'. I see on the icon that the computer has long finished the reboot and is active again.
Xaveer