https://bugs.freedesktop.org/show_bug.cgi?id=70388

--- Comment #22 from Linas Vepstas <linasvepstas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I don't think I have AGP .. trying to figure this out.  The north/southbridge
is NVIDIA Corporation MCP55. 

Here is the PCIe bridge and the video cards:

lspci -vnn

00:0f.0 PCI bridge [0604]: NVIDIA Corporation MCP55 PCI Express bridge
[10de:0377] (rev a3) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    Memory behind bridge: f7000000-f9ffffff
    Prefetchable memory behind bridge: 00000000e0000000-00000000efffffff
    Capabilities: [40] Subsystem: NVIDIA Corporation Device [10de:0000]
    Capabilities: [48] Power Management version 2
    Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
    Capabilities: [60] HyperTransport: MSI Mapping Enable- Fixed-
    Capabilities: [80] Express Root Port (Slot+), MSI 00
    Capabilities: [100] Virtual Channel
    Kernel driver in use: pcieport

01:06.0 VGA compatible controller [0300]: NVIDIA Corporation NV44A [GeForce
6200] [10de:0221] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: eVga.com. Corp. Device [3842:b402]
    Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 16
    Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
    Memory at c0000000 (32-bit, prefetchable) [size=512M]
    Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
    [virtual] Expansion ROM at fc000000 [disabled] [size=128K]
    Capabilities: [60] Power Management version 2
    Kernel driver in use: nouveau

02:00.0 VGA compatible controller [0300]: NVIDIA Corporation G72 [GeForce 7300
LE] [10de:01d1] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: Dell Device [1028:0405]
    Flags: bus master, fast devsel, latency 0, IRQ 42
    Memory at f7000000 (32-bit, non-prefetchable) [size=16M]
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at f8000000 (64-bit, non-prefetchable) [size=16M]
    Expansion ROM at f9fe0000 [disabled] [size=128K]
    Capabilities: [60] Power Management version 2
    Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [78] Express Endpoint, MSI 00
    Capabilities: [100] Virtual Channel
    Capabilities: [128] Power Budgeting <?>
    Kernel driver in use: nouveau

The only dmesg lines that mention AGP, agp or gart are:

[    0.000000] AGP: No AGP bridge found
[    0.000000] AGP: Node 0: aperture [bus addr 0xb4000000-0xb5ffffff]
(32MB)
[    0.000000] Aperture pointing to e820 RAM. Ignoring.
[    0.000000] AGP: Your BIOS doesn't leave a aperture memory hole
[    0.000000] AGP: Please enable the IOMMU option in the BIOS setup
[    0.000000] AGP: This costs you 64MB of RAM
[    0.000000] AGP: Mapping aperture over RAM [mem 0xb4000000-0xb7ffffff]
(65536KB)

[    0.256789] pci 0000:02:00.0: Boot video device
[    0.256791] PCI: CLS 32 bytes, default 64
[    0.256980] PCI-DMA: Disabling AGP.
[    0.257075] PCI-DMA: aperture base @ b4000000 size 65536 KB
[    0.257079] PCI-DMA: using GART IOMMU.
[    0.257083] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture

[    0.284288] Linux agpgart interface v0.103

Should I try vram_pushbuf=1 anyway ?

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