Low HDD free space warning while having ~15G of free space

Shortly after starting up my machine and logging in Gnome reported that I've only a few megabytes (84M or 125M, I can't remember exactly) of free space on /mnt/ssd1. I could not make a screenshot of that notification, unfortunately, but that was on the regular notification area.

According to df I've the following free space on that drive, which is more than 15G.

Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdb 76923000 61781052 15141948 81% /mnt/ssd1

It is an Intel X25-M 80G SSD, but this seem to be irrelevant to the problem. The whole SSD is formatted as a filesystem, no partitions are created on that to prevent alignment issues. It contains an ext4 filesystem. Mount options for ssd1:

/dev/sdb on /mnt/ssd1 type ext4 (rw,noatime,nodiratime,errors=remount-ro,barrier=1,data=ordered)

I guess some part of the codebase still uses an old function to retrieve the free space or contains some math issue causing this behavior. The above df was executed right after getting the message.

It tried to log out, then log in again, but I wasn't able to reproduce this warning message any more.

I don't know whether it is possible to list past notification messages "after the fact" or whether they are logged into a file somewhere. I could not find any information on this.

ProblemType: Bug
Architecture: amd64
Date: Tue Apr 6 00:50:53 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: gnome (not installed)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-20.58-generic
SourcePackage: meta-gnome2
Uname: Linux 2.6.31-20-generic x86_64