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AMD dedicated graphics card not working in Lenovo Laptop

So, I have laptop with integrated and dedicated Graphics card. Integrated is R3 and dedicated is R5 R5 doesn't seem to work; isn't shown as VGA compatible.

Output of lspci -vnnn (I've copied only parts related to GPU)

00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R3 Graphics] [1002:9850] (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:3811] Flags: bus master, fast devsel, latency 0, IRQ 39 Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f0000000 (64-bit, prefetchable) [size=8M] I/O ports at 5000 [size=256] Memory at f0d00000 (32-bit, non-prefetchable) [size=256K] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: <access denied=""> Kernel driver in use: radeon Kernel modules: radeon

01:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430] [1002:6660] (rev ff) (prog-if ff) !!! Unknown header type 7f Kernel driver in use: radeon Kernel modules: radeon