Network timeouts, ACPI-related

The specific card in question is a 3com 3c905c-tx-m, but the motherboard (a Soyo KT400 Dragon Ultra) also has a via-rhine on-board interface that behaves the same way. I can reproduce this on 2.4.18, 2.4.19, 2.4.20-rc1, 2.5.44, 2.5.45, and 2.5.46, with the following
exception: if ACPI is turned on in the 2.5.x kernels (completely on -- if CPU enumeration only is used, the behaviour is the same as if ACPI is turned off), the network starts working fine again, but USB (using uhci-hcd) stops working (rather completely -- I have a USB hub that has an LED to show whether or not it is powered, and it actually shuts off if ACPI is turned on). The various sub-options of ACPI seem to have no effect. It does not matter whether the driver is compiled as a module, or compiled into the kernel.

The following is left in the logs, repeating once per minute or so:

Nov  7 17:03:23 singularity kernel: NETDEV WATCHDOG: eth0: transmit timed out
Nov  7 17:03:23 singularity kernel: eth0: transmit timed out, tx_status 00 status e601.
Nov  7 17:03:23 singularity kernel:   diagnostics: net 0ccc media 88c0 dma 0000003a fifo 8000
Nov  7 17:03:23 singularity kernel: eth0: Interrupt posted but not delivered -- IRQ blocked by another device?
Nov  7 17:03:23 singularity kernel:   Flags; bus-master 1, dirty 3728(0) current 3728(0)
Nov  7 17:03:23 singularity kernel:   Transmit list 00000000 vs. f5fcb200.
Nov  7 17:03:23 singularity kernel:   0: @f5fcb200  length 800000b9 status 000100b9
Nov  7 17:03:23 singularity kernel:   1: @f5fcb240  length 800000b9 status 000100b9
Nov  7 17:03:23 singularity kernel:   2: @f5fcb280  length 800000b9 status 000100b9
Nov  7 17:03:23 singularity kernel:   3: @f5fcb2c0  length 80000079 status 00010079
Nov  7 17:03:23 singularity kernel:   4: @f5fcb300  length 800000a2 status 000100a2
Nov  7 17:03:23 singularity kernel:   5: @f5fcb340  length 80000079 status 00010079
Nov  7 17:03:23 singularity kernel:   6: @f5fcb380  length 80000050 status 00010050
Nov  7 17:03:23 singularity kernel:   7: @f5fcb3c0  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   8: @f5fcb400  length 80000050 status 00010050
Nov  7 17:03:23 singularity kernel:   9: @f5fcb440  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   10: @f5fcb480  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   11: @f5fcb4c0  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   12: @f5fcb500  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   13: @f5fcb540  length 8000002a status 0001002a
Nov  7 17:03:23 singularity kernel:   14: @f5fcb580  length 80000050 status 80010050
Nov  7 17:03:23 singularity kernel:   15: @f5fcb5c0  length 8000002a status 8001002a
Nov  7 17:03:23 singularity kernel: eth0: Resetting the Tx ring pointer.

Please let me know if there is anything else useful I can provide or do.

Zed Pobre <[email protected]> a.k.a. Zed Pobre <[email protected]>
PGP key and fingerprint available on finger; encrypted mail welcomed.