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Ticket Resolution Summary Owner Reporter
#18419 worksforme Auto-resize Guest Display and Seamless Mode does not work -> configuration issue wojciech
Description

Environment:

Host:

  • OS: Windows 7 release 6.1.7601 Service Pack 1

Guest:

  • OS: Ubuntu 18.04.1 LTS (xubuntu-18.04.1-amd64)
  • Linux kernel: vmlinuz-4.15.0-45-generic
  • Platform: x86_64
  • Desktop: xfce4 4.12.4

VirtualBox:

  • Version: 5.2.26 r128414 (Qt5.6.2)
  • Extension Pack Version: 5.2.26r128414

CAUTION:

I am posting this ticket for information purposes, to save time of people who have "nomodeset" kernel parameter in their grub.cfg

2 weeks ago "Auto-resize Guest Display" and "Seamless Mode" worked fine, but last week something has changed. I could not pin-point the source of problem for couple days, I remember I installed ubuntu updates as usual and after starting VBox the next day both modes became grayed out in "View" menu.

I tried to solve the problem using tips found on VBox forums:

1) Installed new VBox with guest additions - it did not help.

2) I set "Maximum Guest Screen Size" to "Automatic" in File > Preferences ... > Display tab - it did not help.

3) I tried to trigger the guest system to switch to a particular resolution by sending a video mode hint using the VBoxManage tool.

I opened cmd.exe in Windows and did the following:

cd C:\Program Files\Oracle\VirtualBox\

VBoxManage.exe controlvm xubuntu-18.04.1-amd64 setvideomodehint 1920 1080 32

but inside VBox.log I saw just a single event:

VMMDev: SetVideoModeHint: Got a video mode hint (1920x1080x32)@(0x0),(1;0) at 0

of course guest screen resolution did not change.

4) Finally I set the GRUB_GFXMODE to 1280x1024x32 in GRUB and booted ubuntu, the guest screen became big enough to work on it, but "Auto-resize Guest Display" and "Seamless Mode" still did not work.

I started GRUB in commad-line mode to see what video modes (resolutions) are supported by graphic adapter:

grub> hwinfo

or

grub> vbeinfo

From available modes I choose 1280x1024x32

Then I booted the ubuntu and created a new grub.cfg:

# vim /etc/default/grub

GRUB_GFXMODE=1280x1024x32
GRUB_GFXPAYLOAD_LINUX=keep

# grub-mkconfig -o /boot/grub/grub.cfg

at this moment I noticed that I have "nomodeset" kernel parameter in GRUB_CMDLINE_LINUX. After removing it and recreating grub.cfg I booted ubuntu one again, when Xfce login window was displayed the "Auto-resize Guest Display" and "Seamless Mode" menu item become available.

#19788 fixed Auto-resize Guest Display disabled with VMSVGA Sam Morris
Description

Now that VMSVGA is the default for Linux guests, I have changed my VM over to using it.

I have found that the 'audio-resize guest display' option is unavailable.

Some error messages can be obtained from VBoxClient with:

$ VBoxClient -v -f --vmsvga
VMWARE's ctrl extension is available. Major Opcode is 128.
Failed to register resizing support, rc=VERR_INVALID_FUNCTION
Failed to get display change request, rc=VERR_ACCESS_DENIED

Corresponding kernel messages:

Aug 03 14:15:54 kernel: Service: Display SVGA X11
Aug 03 14:15:54 kernel: VMWARE's ctrl extension is available. Major Opcode is 128.
Aug 03 14:15:54 kernel: Failed to register resizing support, rc=VERR_INVALID_FUNCTION
Aug 03 14:15:54 kernel: Denying userspace vmm call type 0x000051
Aug 03 14:15:54 kernel: Failed to get display change request, rc=VERR_ACCESS_DENIED

It's not clear whether this option is not supported under VMSVGA or not. If not then that should be documented somewhere.

I'm seeing this with VirtualBox 6.1.12 but that option isn't available in the bug tracker(!)

There are a couple of similar bugs:

#3656 obsolete Auto-resize Guest Display does not work anymore patrick.steiner
Description

Since I habe updated to Virtualbox 2.2.0 the Auto-resize of the Guest Display does not work any more.

My host system is a Mac OS X (10.5.6) machine in my guest is a Fedora 10 Machine.

I also can not set the display resolution to 1280x800 on the guest system. it is only 1024x768 is available. But i have choosen a generic 1280x800 lcd display.

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