Ubuntu 15.04 caot detected R9 380x?

Hi,guys!
this is my pc info(who can give me some advance?thanks very much). I'm sure the graphics card is installed correctly!
zjhxmjl@ubuntu:~$ lsb_release -a && uname -r
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
3.19.0-59-generic

zjhxmjl@ubuntu:~$ sudo lshw -C video
*-display UNCLAIMED
description: VGA compatible controller
product: C61 [GeForce 6150SE nForce 430]
vendor: NVIDIA Corporation
physical id: d
bus info: pci@0000:00:0d.0
version: a2
width: 64 bits
clock: 66MHz
capabilities: pm msi vga_controller bus_master cap_list
configuration: latency=0
resources: memory:fb000000-fbffffff memory:e0000000-efffffff memory:fc000000-fcffffff memory:80000000-8001ffff

zjhxmjl@ubuntu:~$ lspci -v | grep -i VGA -A 12
00:0d.0 VGA compatible controller [0300]: NVIDIA Corporation C61 [GeForce 6150SE nForce 430] [10de:03d0] (rev a2) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:0412]
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 5
Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at fc000000 (64-bit, non-prefetchable) [size=16M]
[virtual] Expansion ROM at 80000000 [disabled] [size=128K]
Capabilities: <access denied>

00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Family 10h Processor HyperTransport Configuration [1022:1200]
Flags: fast devsel
Capabilities: <access denied>