Hi folks,

Im a bit stuck on an issue, where my lspci output is not showing all 4 of my GPU cards. Before I go any further, below are my configuration details and what I have done so far.

Problem:

Only the 2 out of 4 GPU's are visible in the lspci output.
2 GPU's which show in lspci output, are both in the PCIe 16x slots.
However, Remaining 2 GPU's in the PCIe 8x slots are not showing in lspci output !! Wtf!?!?

Objective:

Make use of 4 cards in my system, either individually or by using crossfire.

Hardware setup:

Intel i3770k + 4gb Ram
Gigabyte Z77A-UP7 Motherboard (Factory firmware)
4 x Gigabyte ATI Radeon HD7970 (Factory firmware)
1200watt Thermaltake PSU

OS Setup:

Ubuntu 64bit 12.04.2 Server
Kernel: 3.5.0-27-generic #46~precise1-Ubuntu SMP Tue Mar 26 19:33:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux (uname -a output)
AMD Drivers: amd-driver-installer-catalyst-13.1-linux-x86.x86_64 (compiled against 3.5.0-27 kernel headers)
AMD APP SDK: AMD-APP-SDK-v2.8-lnx64 (compiled against Catalyst 13.1 drivers)

Tested:

Ran through the BIOS and verified all configuration options were enabled (from what I could tell)
Verified all cards are powered and working (All fans spin up and they're all producing heat)
Tested all cards individually plugged into the PCIe 16x slots, verified lspci output showing card details
With all 4 GPU's plugged in and running:
- aticonfig --adapter=all -f --initial (Still no success, only showing 2/4 cards)
- Creating an mpgu chain and enabling crossfire configuration, connecting the crossfire ribbons etc. (Still no success, only showing 2/4 cards)
No change to lspci output after running: sudo update-pciids

I am absolutely stumped on this problem and I suspect this issue could be Kernel and/or motherboard chipset driver support related.

From what I understand, regardless if the kernel modules are loaded or not - lspci should still show a list of hardware devices it has detected.

The next logical step in my trouble shooting, would be to compile a kernel from scratch, and everyone knows this is a painstakingly laborious task which I would like to try and avoid

Im hoping that someone else out there has ran into a similar problem and might be able to point me in the right direction.

lspci output:

root@host:~# lspci 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09) 00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) 00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 04) 00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4) 00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4) 00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 (rev c4) 00:1c.5 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 6 (rev c4) 00:1c.6 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 7 (rev c4) 00:1c.7 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 8 (rev c4) 00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation Z77 Express Chipset LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 7 Series/C210 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04) 00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04) 01:00.0 PCI bridge: PLX Technology, Inc. Device 8747 (rev ba) 02:08.0 PCI bridge: PLX Technology, Inc. Device 8747 (rev ba) 02:10.0 PCI bridge: PLX Technology, Inc. Device 8747 (rev ba) 03:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Tahiti XT [Radeon HD 7970] 03:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Tahiti XT HDMI Audio [Radeon HD 7970 Series] 04:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Tahiti XT [Radeon HD 7970] 04:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Tahiti XT HDMI Audio [Radeon HD 7970 Series] 06:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172 SATA 6Gb/s Controller (rev 11) 07:00.0 USB controller: VIA Technologies, Inc. VL80x xHCI USB 3.0 Controller (rev 03) 08:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01) 09:00.0 Ethernet controller: Qualcomm Atheros AR8161 Gigabit Ethernet (rev 10) 0a:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172 SATA 6Gb/s Controller (rev 11)

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