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How to blacklist secondary identical video card, and other KVM problems.

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Hello:) I'd like to take a shot at video pass through through on KVM, using a Radeon HD6450. I haven't come across a lot of info about my video identical cards, except one (hope it's still useful). It says I need to blacklist the video card I'm going to use (is this right?), but doesn't explain much about how to blacklist an identical card. I have no onboard video, so how do I this?

Also... is this a good idea running UbuntuStudio's real-time kernel? I've been looking around, and I see a lot of posts about patching kernels. I also saw one post that said it shouldn't apply for Ubuntu 14.04. So I'm a little confused, and worried about breaking my system. I don't have any experience with KVM, but I did manage to get it running windows yesterday (with some permissions, and error problems [that changed messages today] I still don't understand). Virtual Manager will still open, but I'm not sure how to solve my error. Please advise:)

Error:
Code:

$ virsh -c qemu
error: failed to connect to the hypervisorerror: no connection driver available for qemu

KVM Info:
Code:

$ groups
adm cdrom sudo audio dip plugdev lpadmin sambashare vboxusers kvm libvirtd

Code:

$ ls -l /dev/kvm
$ crw-rw----+ 1 root root 10, 232 Jul  8 22:04 /dev/kvm

CPU (IOMMU enabled in Bios)
Code:

$ egrep -c '(vmx|svm)' /proc/cpuinfo
8


VIDEO CARDS:
Code:

$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]

Primary GPU
Code:

$ lspci -v -s 01:00.0

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 [VGA controller])
    Subsystem: ASUSTeK Computer Inc. Device 0461
    Flags: bus master, fast devsel, latency 0, IRQ 84
    Memory at c0000000 (64-bit, prefetchable) [size=256M]
    Memory at fea20000 (64-bit, non-prefetchable) [size=128K]
    I/O ports at e000 [size=256]
    Expansion ROM at fea00000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: radeon

Seconary GPU

Code:

$ lspci -v -s 02:00.002:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 [VGA controller])
    Subsystem: ASUSTeK Computer Inc. Device 0461
    Flags: bus master, fast devsel, latency 0, IRQ 85
    Memory at b0000000 (64-bit, prefetchable) [size=256M]
    Memory at fe920000 (64-bit, non-prefetchable) [size=128K]
    I/O ports at d000 [size=256]
    Expansion ROM at fe900000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: radeon


Kernel:
Code:

uname -aLinux av 3.19.0-46-lowlatency #52~14.04.1-Ubuntu SMP PREEMPT Thu Jan 14 12:13:18 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

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