A friend gave me an old MacPro and installed 14.04 on it. Having a problem with occasional stutters on the video - screen freezes for a second or two, then returns to normal. Guessing it's something to do with XOrg, any suggestions how to troubleshoot?
Running both AMD and Nvidia display cards using the XOrg open source drivers:
02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 5770] [1002:68b8] (prog-if 00 [VGA controller])
Subsystem: Apple Inc. MacPro5,1 [Mac Pro 2.8GHz DDR3] [106b:00cf]
Physical Slot: 1
Flags: bus master, fast devsel, latency 0, IRQ 58
Memory at 80000000 (64-bit, prefetchable) [size=512M]
Memory at b3e00000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 3000 [size=256]
Expansion ROM at b3e20000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
06:00.0 VGA compatible controller [0300]: NVIDIA Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd Device [1458:34d5]
Physical Slot: 3
Flags: bus master, fast devsel, latency 0, IRQ 59
Memory at b2000000 (32-bit, non-prefetchable) [size=16M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
Memory at b0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 2000 [size=128]
Expansion ROM at b3000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nouveau
System: 9.8 GiB RAM Intel® Xeon(R) CPU E5462 @ 2.80GHz × 8 Gallium 0.4 on AMD JUNIPER 64-bit
Cheers