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Old 05-03-2016, 12:45 PM   #1
fanoflq
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How do you wake up CentOS7 from suspend mode in Virtual Box?


To reduce power consumption,
I suspended CentOS7 in virtual box like so:

systemctl suspend

The it turns into a black screen.
But when I click inside the black screen,
there is no response.
I have to shutdown virtual box and re-start.

How do you wake up CentOS7 from suspend mode in Virtual Box?
 
Old 05-03-2016, 12:56 PM   #2
erik2282
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Mine does the same so I dont use Suspend on the guest OS. I use the Pause feature on VirtualBox which can be found on the Machine drop-down menu, or by right-clicking the vm on the VirtualBox Manager.

Last edited by erik2282; 05-03-2016 at 12:59 PM.
 
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Old 05-03-2016, 01:18 PM   #3
fanoflq
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Thank.
Not sure if that save power by pausing this way.

How to you un-hide the toolbar in the VM?
That toolbar with menu items like Machine, ...

I also just clicked status bar, and it disappeared.
I did not see any provision to un-hide those bars!

Last edited by fanoflq; 05-03-2016 at 01:21 PM.
 
Old 05-03-2016, 01:33 PM   #4
fanoflq
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Answer to self:

In VM do this:

<Right-Ctrl> + <Home>
View > Menu Bar > Show Menu Bar


<Right-Ctrl> + <Home>
View > Status Bar > Show Status Bar
 
Old 05-03-2016, 01:39 PM   #5
erik2282
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Quote:
Originally Posted by fanoflq View Post
Thank.
Not sure if that save power by pausing this way.
Not sure either. I don't do it save power though.

Quote:
Originally Posted by fanoflq View Post
How to you un-hide the toolbar in the VM?
That toolbar with menu items like Machine, ...

I also just clicked status bar, and it disappeared.
I did not see any provision to un-hide those bars!

HostKey + <HOME>

My host key is the right Ctrl key, which if I remember correctly is default.

This will pop-up menu, go to View and you will see Menu Bar and Status bar. Here you can show/hide.
 
Old 05-03-2016, 01:40 PM   #6
erik2282
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ha you beat me.
 
Old 05-03-2016, 01:41 PM   #7
fanoflq
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Thank you for your help.
 
Old 05-03-2016, 01:43 PM   #8
erik2282
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You're welcome.
 
Old 05-03-2016, 01:45 PM   #9
fanoflq
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One more question:
Quote:
I don't do it save power though.
What do you use it for?
 
Old 05-03-2016, 02:57 PM   #10
erik2282
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I use it instead of turning off the VM. I guess there's no good reason to use it now after doing some research. I just read this
https://www.virtualbox.org/ticket/8368

Quote:
"Pause" functionality in VirtualBox was intended to temporarily stop VM execution so that VirtualBox process consumed zero host CPU cycles.

Unfortunately it's not the case:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
12482 birdie 20 0 688m 619m 586m S 2.0 15.4 0:20.84 2 VirtualBox

I see consistent 2% CPU usage even though supposedly VirtualBox must be 100% idle.
Never gave it much thought.
 
  


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