I am being bothered by the strange screen fragment while using emacs.

Sometimes, when I edit something in emacs, the screen gets fragmented like this:

The lines are not correctly updated

enter image description here

Below is the correct display

enter image description here

My ubuntu is in VirtualBox. The VirtualBox version is 4.3.10. I have installed the guest addition.

The ubuntu I am using is

ubuntu 13.10
Intel® Core™ i7-2600 CPU @ 3.40GHz × 4
Chromium 64-bit

The emacs I am using should be the newest one

GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.6) of 2014-01-03 on gold, modified by Debian

  • Try adding this to your ~/.emacs file: ` (setq-default column-number-mode t)`. Does that help?
    – terdon
    Apr 14, 2014 at 13:35
  • @terdon just did, let me use for a while and see whether it works. can you tell me what's the purpose of that setting? Apr 14, 2014 at 14:09
  • Not really, no :) That's why this was just a comment. I had a similar, though not identical, problem and that helped. It is something to do with the number of columns your window has and seems to help with the drawing issues you describe. I believe the root of the problem is a miscommunication between emacs and the compositing window manager but I'm not sure.
    – terdon
    Apr 14, 2014 at 14:12
  • @terdon sorry to tell ya that it didn't work. still I am having this issue Apr 14, 2014 at 14:57
  • Yeah, that was just a wild shot in the dark. It improved but did not fix it for me too. Are you using unity or another desktop environment?
    – terdon
    Apr 14, 2014 at 15:01


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