Comment 11 for bug 98783

The problem is that the people that can work on the problem think that there
is no problem, since measuring memory use is not something easy, and any
badly written app (typically it was flashplayer, but I already tried
disabling it) can leak pixmem. So until somebody of us identify which is the
culprit, and it can be different for any of us, there's no way this is going
to be solved.

The fact is that now my X server is using ~300m and if I quit the session
(all X programs except gdm), it will still be using almost all that memory,
go figure.

Now, you say that with another graphics card you don't have the same
problem, maybe that is the root of all evil, are you using the same version
of the nvidia driver? Most reports have been with nVidia, and since some of
the reports are "false positives" it may well be a driver problem.