man top claims:
Note: The 'Command' field/column is unique, in that it is not fixed-width. When displayed, this
column will be allocated all remaining screen width (up to the maximum 512 characters) to provide
for the potential growth of program names into command lines.
But it is only true in full command line mode "c". If only program name is displayed in COMMAND field then it is unnecessary truncated.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: procps 1:3.2.8-11ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Sat Apr 7 17:58:30 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120401)
ProcEnviron:
TERM=xterm
LANG=cs_CZ.UTF-8
SHELL=/bin/bash
SourcePackage: procps
UpgradeStatus: No upgrade log present (probably fresh install)
I see no activity :-(
But my report is probably duplicate of Bug #295876.