Hi Alexander, Thank you for your reply. I'm right using "Save Machine State" in VirtualBox. And the 7.0.20 install pack was downloaded just from its official website so I have no idea why it could be a unstable version instead of a stable one. Actually, I just want to use hibernate instead of save-machine-state to shorten restoring time. So if there's no solution, just let it go. And if there's any one interested about this issue, you could just sand e-mail to VirtualBox.
Thanks again for your kind and helpful reply. Best Regards, Richard ------------------ Origin ------------------ FROM: "Alexander V. Makartsev" <avbe...@gmail.com>; Time: 2024,9,26(Thu) 11:45pm To: "debian-user"<debian-user@lists.debian.org>; Subject: Re: Re?? Is there any way to STD in Debian? On 26.09.2024 19:36, YOYO wrote: Hi Alexander, Eben, and everyone in list, Thank you for your replies. The Debian 12 is running in VirtulBox 7.0.20. And I only assigned 2048 MB RAM to it. I'm pretty sure that I have setup a big enough SWAP of around 8 GB when installing Debian 12. When I click "Sleep" button in Windows running in VirtualBox 6.x, the virtual machine will light the screen up again once the screen is off. However, in this case, Debian 12 doesn't light the screen up nor power-off the virtual machine. So the virtual machine goes into a state that OS is not running, power is still on. And I have no way to wake the OS up. All I can do is to fouce power-off and re-start it, just to found all running tasks gone. I don't use VirtualBox and I think this is VirtualBox issue not Debian issue. VirtualBox is not even in Stable repos: $ rmadison virtualbox virtualbox | 7.0.20-dfsg-1 | unstable-debug/contrib | source virtualbox | 7.0.20-dfsg-1 | unstable/contrib | source, amd64 Maybe it is better to use a "save machine state" feature of the VirtualBox instead? https://www.virtualbox.org/manual/topics/Introduction.html#intro-save-machine-state -- With kindest regards, Alexander. Debian - The universal operating system https://www.debian.org