Also seeing this in 15.04 with fglrx-updates:
$ lspci -vv -s 01:00 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (rev ff) (prog-if ff) !!! Unknown header type 7f Kernel driver in use: radeon
Also seeing this in 15.04 with fglrx-updates:
$ lspci -vv -s 01:00
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (rev ff) (prog-if ff)
!!! Unknown header type 7f
Kernel driver in use: radeon