1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="guestadd-resizing-linux">
<title>X11/Wayland Desktop Environments</title>
<body>
<p>
The Guest Additions provide services for controlling the guest
system's monitor topology. Monitor topology means the resolution
of each virtual monitor and its state (disabled/enabled). The
resolution of a virtual monitor can be modified from the host
side either by resizing the window that hosts the virtual
monitor, by using the <b outputclass="bold">View</b> menu
or the <userinput>VBoxManage controlvm
<varname>vmname</varname> setscreenlayout</userinput>
command. On guest operating systems with X11/Wayland desktops
this is put into effect by either of the following two services:
</p>
<pre xml:space="preserve"> VBoxClient --vmsvga
VBoxDRMClient
</pre>
<p>
The following are some details about guest screen resolution
control functionality:
</p>
<ul>
<li>
<p>
On X11/Wayland desktops the resizing service is started
during desktop session initialization, that is desktop
login. On X11 desktops <codeph>VBoxClient --vmsvga</codeph>
handles screen topology through the RandR extension. On
Wayland clients <codeph>VBoxDRMClient</codeph> is used. The
decision is made automatically at each desktop session
start.
</p>
</li>
<li>
<p>
On 32-bit guest operating systems
<userinput>VBoxDRMClient</userinput> is always used, in order to
work around bugs.
</p>
</li>
<li>
<p>
Since the monitor topology control services are initialized
during the desktop session start, it is impossible to
control the monitor resolution of display managers such as
GDM or LightDM. This default behavior can be changed by
setting the guest property
<codeph>/VirtualBox/GuestAdd/DRMResize</codeph> of the
virtual machine to any value. See
<xref href="guestadd-guestprops.dita#guestadd-guestprops"/> for details of how to
update guest properties. When this guest property is set
then <userinput>VBoxDRMClient</userinput> is started during the
guest OS boot and stays active all the time, for both the
display manager login screen and the desktop session.
</p>
</li>
</ul>
</body>
</topic>
|
