With my Toshiba Satellite 1805-S204 laptop this happens on reboot only. Shutdown works cleanly. On my Sylvania g Netbook Meso and my ancient Toshiba Libretto SS1010 both shutdown and reboot work properly. This has been the case for previous VL releases as well. The only distro I have found that correctly reboots my Toshiba is Ubuntu.
I'm not familiar with Uniwill but I can tell you that this is an issue of your specific hardware not being properly supported. If your manufacturer supports Linux they may have an acpi module or other driver which corrects this issue.
Does it work in any other distribution? If so, and if the machine is dual boot, we can compare the kernel modules loaded to see if anything is different.