I found this hint in /var/log/syslog:
Jan 26 16:17:20 aardvark hp[30781]: io/hpmud/jd.c 561: timeout
write_channel hp:/net/Deskjet_6980_series?zc=deskjet
Jan 26 16:18:50 aardvark hp[30781]: io/hpmud/jd.c 561: timeout
write_channel hp:/net/Deskjet_6980_series?zc=deskjet
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https://bugs.launchpad.net/bugs/921432
Title:
CUPS hangs printing to HP Deskjet 6988
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