Public bug reported: 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? ** Affects: ubuntu Importance: Undecided Status: New -- Virtual guests' console is unusably slow due to framebuffer usage https://bugs.launchpad.net/bugs/582145 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
