Comment 8 for bug 644943

On Sat, 25 Sep 2010, Kalle Valo wrote:

> I installed xterm_256-1ubuntu1_amd64.deb from lucid (which doesn't have
> this problem in my lucid workstation) and I was able to reproduce the
> problem immediately. So the bug is elsewhere than in xterm. But where?
> My knowledge of X is limited, so I would appreciate some help to find
> the culprit.

The screenshots seemed to show that some parts of the cells drawn for
each character weren't being (re)painted. The problem could be from
a variety of places, however for the default "fixed" font, it usually
doesn't point at xterm (otherwise it would be visible in lots of

Most of the logic involved for the fixed font seems to be in the X server
itself (xterm is using Xlib calls which have been very stable, barring
whatever's going on with Xcb). So I'd start by trying to factor out the X
server, then look at libraries (on the client side) such as the low-level
X11 vs Xcb.

Thomas E. Dickey