Virtual guests' console is unusably slow due to framebuffer usage
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
This was also discussed in https:/
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:/
I have experienced this using KVM and virt-manager/
$ echo "blacklist vga16fb" | sudo tee -a /etc/modprobe.
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 → linux (Ubuntu) |
tags: | added: karmic lucid |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
status: | Confirmed → Incomplete |
Hello, try to add in /etc/modprobe. d/aliases
alias vesafb off
alias vga16fb off
alias vgastate off
alias softcursor off
alias cfbimgblt off
alias cfbfillrect off
alias cfbcopyarea off
alias fbcon off
alias tileblit off
alias font off
alias bitblit off
then dpkg-reconfigure linux-image-`uname -r`
now I have super spedd console in VM