On my search to a solution of slow scrolling in my terminals (tty) I stumbled upon this report.
After upgrading from 3.12.4 to 3.13-rc7 the problem is gone (without blacklisting additional fb modules). Note: I'll leave the tags are report status for the Andreas -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/582145 Title: Virtual guests' console is unusably slow due to framebuffer usage Status in “linux” package in Ubuntu: Incomplete 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? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/582145/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
