Fixed in linux-restricted-modules-2.6.15_2.6.15.9-1:
Changes:
linux-restricted-modules-2.6.15 (2.6.15.9-1) dapper; urgency=low
.
* Update fglrx to 8.24.8, which includes support for the Radeon X1n00 series
and the Mobility Radeon X1n00 series cards (closes: launchpad.net/39924)
--
ati x1400
https://launchpad.net/bugs/40998