Still having issues with latest mainline kernel:

>uname -a 
Linux server 2.6.35-28-server #49-Ubuntu SMP Tue Mar 1 14:55:37 UTC 2011 x86_64 
GNU/Linux

>modinfo atl1c
filename:       /lib/modules/2.6.35-28-server/kernel/drivers/net/atl1c/atl1c.ko
version:        1.0.0.2-NAPI
license:        GPL
description:    Atheros 1000M Ethernet Network Driver
author:         Jie Yang <[email protected]>
srcversion:     DD089D2E4AEAF5FC653AC92
alias:          pci:v00001969d00001073sv*sd*bc*sc*i*
alias:          pci:v00001969d00002062sv*sd*bc*sc*i*
alias:          pci:v00001969d00002060sv*sd*bc*sc*i*
alias:          pci:v00001969d00001062sv*sd*bc*sc*i*
alias:          pci:v00001969d00001063sv*sd*bc*sc*i*
depends:        
vermagic:       2.6.35-28-server SMP mod_unload modversions 

>grep atl1c /var/log/dmesg

[    1.898334] atl1c 0000:05:00.0: PCI INT A -> Link[LN4A] -> GSI 19 (level, 
low) -> IRQ 19
[    1.898451] atl1c 0000:05:00.0: setting latency timer to 64
[    2.062650] atl1c 0000:05:00.0: version 1.0.0.2-NAPI
[   38.534777] atl1c 0000:05:00.0: irq 46 for MSI/MSI-X
[   38.534917] atl1c 0000:05:00.0: atl1c: eth1 NIC Link is Up<1000 Mbps Full 
Duplex>
[   38.698625] atl1c 0000:05:00.0: atl1c: eth1 NIC Link is Down

kernel is booted with "acpi_enforce_resources=lax apci=copy_dsdt"

To make this even more fun, every third of fourth reboot it works and the 
network interfaces stays up.
Will try custom module build next.

This is now on Karmic obviously

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https://bugs.launchpad.net/bugs/512764

Title:
  Atheros AR81xx ( atl1c.ko ) drivers causes hangs while writing with
  NFS protocol

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