Hello, A user (cc'd) reported that nouveau's enabling of MSI causes the card to not work on his setup [1]. I think the situation is that MSI is just not supported by the underlying motherboard, even though the card, and probably bridge, support it just fine. It's a very old board. The nouveau code does: pmc->use_msi = pci_enable_msi(device->pdev) == 0; Does it need to do more checking than that before trying to enable MSI on the device? Could it be that the linux pci subsystem is missing on inheriting MSI capabilities somewhere? Thanks, -ilia [1] 00:00.0 Host bridge [0600]: Intel Corporation 430FX - 82437FX TSC [Triton I] [8086:122d] (rev 01) Flags: bus master, medium devsel, latency 64 00:0e.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1 Lane PCI Express-to-PCI Bridge [10b5:8112] (rev aa) (prog-if 00 [Normal decode]) Flags: bus master, 66MHz, medium devsel, latency 66 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 0000f000-0000ffff Memory behind bridge: f5e00000-fbffffff Prefetchable memory behind bridge: d5d00000-f5dfffff Capabilities: [40] Power Management version 2 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [60] Express PCI/PCI-X to PCI-Express Bridge, MSI 00 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G96 [GeForce 9400 GT] [10de:0641] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Jaton Corp Device [1b13:0641] Flags: bus master, fast devsel, latency 0, IRQ 11 Memory at fb000000 (32-bit, non-prefetchable) [size=16M] Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f8000000 (64-bit, non-prefetchable) [size=32M] I/O ports at fc80 [size=128] [virtual] Expansion ROM at d5d00000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Capabilities: [b4] Vendor Specific Information: Len=14 <?> Kernel driver in use: nouveau -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html