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I can't really describe the slightly odd behaviour of my terminal window and occasionally also on emacs, but here's a picture of it happening:

Weird stuff

If I press CTRL+L, it disappears. What could cause this? It started happening once I upgraded to Ubuntu 10.10, so I expect something broke there. It's a zsh shell using xterm. The computer in question is an Acer Aspire Timeline 4810T.

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looks like problem with xorg or video driver. does it happen outside of the terminal? – phunehehe Oct 18 '10 at 15:30
Yes, in emacs. Though not as often as it does in xterm. – Seamus Oct 18 '10 at 15:51
@Seamus: it could be a bug anywhere from the font data to the video card through the client font handling library, other client X libraries, the X server, your X video driver. Does the bug show up with other fonts, or at other sizes? Does moving the window, or hiding it and showing it again, or resizing it change anything? – Gilles Oct 18 '10 at 17:53
You might more help if you ask on askubuntu.com – Lipis Oct 19 '10 at 1:17
Bug reported here: bugs.edge.launchpad.net/ubuntu/+source/xterm/+bug/663469? – Seamus Oct 20 '10 at 12:15
up vote 2 down vote accepted

This is a bug with xorg and a fix exists.

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