[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/582145
Title:
Virtual guests' console is unusably slow due to framebuffer usage
Status in “linux” package in Ubuntu:
Expired
Bug description:
This was also discussed in https://lists.ubuntu.com/archives/ubuntu-
server/2010-May/004172.html
The problem is that the console of a Ubuntu 10.04 (server) virtual
machine/guest becomes incredibly slow and really unusable as soon as
it starts scrolling. This is apparently due to the kernel switching on
the console framebuffer which does not play well with the VNC-based
console viewers of virt-manager. I have created a screencast to
demonstrate, please find it here: https://daff.pseudoterminal.org/misc
/console-slow.ogg
I have experienced this using KVM and virt-manager/virt-viewer on
Ubuntu 10.04 and Ubuntu 9.10 hosts (using the server edition, FWIW).
Apparently it also happens with VirtualBox but I have not tested this
myself. The only solution for the time being seems to be to blacklist
the vga16fb module as suggested by Paul Nuffer:
$ echo "blacklist vga16fb" | sudo tee -a /etc/modprobe.d/blacklist
Merely adding "nomodeset" to the kernel boot options is not
sufficient.
I don't even know exactly to which package this bug belongs let alone
what to do about it except force the kernel not to use a console
framebuffer. I know Plymouth needs the framebuffer to display splash
screens and whatnot but there should be a proper way to disable it
when running as a virtual machine. And since the splash screen is
disabled anyway when creating a server virtual machine there is really
no use in a framebuffer, especially if it slows everything down to a
crawl. So what to do?
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