Problem with Using 2 AMD Cards in 16.04
I have two identical AMD Cards and whichever card I name in the BIOS as primary correctly displays the desktop and allows me to orient the desktop directly (landscape, portrait, etc).
The secondary card will not allow the settings to be changed in anyway. Performance is not ideal although the displays on the secondary card do work and applications will run on them.
While I am a relatively new user to Ubuntu I am quite willing to help provide further information for de-bugging purposes.
Please note that I had the same issue in 14.04 even after installing the FGLRX drivers.
I appreciate any help that can be provided.
This is from Xorg:
xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
LSPCI Info:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XTX [Radeon HD 8490 / R5 235X OEM] (prog-if 00 [VGA controller])
Subsystem: Dell Caicos XTX [Radeon HD 8490 / R5 235X OEM]
Flags: bus master, fast devsel, latency 0, IRQ 32
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f7d20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at f7d00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6400 Series]
Subsystem: Dell Caicos HDMI Audio [Radeon HD 6400 Series]
Flags: bus master, fast devsel, latency 0, IRQ 37
Memory at f7d40000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XTX [Radeon HD 8490 / R5 235X OEM] (prog-if 00 [VGA controller])
Subsystem: Dell Caicos XTX [Radeon HD 8490 / R5 235X OEM]
Flags: bus master, fast devsel, latency 0, IRQ 34
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at f7c20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at d000 [size=256]
Expansion ROM at f7c00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6400 Series]
Subsystem: Dell Caicos HDMI Audio [Radeon HD 6400 Series]
Flags: bus master, fast devsel, latency 0, IRQ 38
Memory at f7c40000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
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