Possible problem with forcedeth (Nvidia ION MCP79 Realtek 8211CL gigabit)

Hi.  I noticed that my Zotac IONITX-C-U mainboard is only doing
100mbit although the ethernet device is 1000mbit.  I know the chip is
a Realtek 8211CL because I looked at the mainboard and got the model
number directly from it.  If I plug another box into the same cable,
it auto-negotiates 1000mbit no problem so that rules out a cable
problem.

Any help/suggestions are appreciated!

Not sure what info is needed but I'm using debian testing with drivers
from stable kernel 2.6.38.  My kernel config has:

Device Drivers > [*] Network device support:
<*> PHY Device support and infrastructure > <*> Drivers for Realtek PHYs
[*] Ethernet (10 or 100Mbit) > [*] EISA, VLB, PCI and on board
controllers > <*> nForce Ethernet support

dmesg:

[    0.424389] forcedeth: Reverse Engineered nForce ethernet driver.
Version 0.64.
[    0.424923] ACPI: PCI Interrupt Link [LMAC] enabled at IRQ 21
[    0.424936] forcedeth 0000:00:0a.0: PCI INT A -> Link[LMAC] -> GSI
21 (level, low) -> IRQ 21
[    0.424947] forcedeth 0000:00:0a.0: setting latency timer to 64
[    0.478258] forcedeth 0000:00:0a.0: ifname eth0, PHY OUI 0x732 @ 3,
addr 00:01:2e:26:36:3c
[    0.478268] forcedeth 0000:00:0a.0: highdma csum pwrctl gbit lnktim
msi desc-v3

lspci -n:

00:0a.0 Ethernet controller [0200]: nVidia Corporation MCP79 Ethernet
[10de:0ab0] (rev b1)

lspci -vvv:

00:0a.0 Ethernet controller: nVidia Corporation MCP79 Ethernet (rev b1)
        Subsystem: ZOTAC International (MCO) Ltd. Device a108
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0 (250ns min, 5000ns max)
        Interrupt: pin A routed to IRQ 21
        Region 0: Memory at fae7c000 (32-bit, non-prefetchable) [size=4K]
        Region 1: I/O ports at d080 [size=8]
        Region 2: Memory at fae7e400 (32-bit, non-prefetchable) [size=256]
        Region 3: Memory at fae7e000 (32-bit, non-prefetchable) [size=16]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst- PME-Enable+ DSel=0 DScale=0 PME-
        Kernel driver in use: forcedeth

ethtool:

Settings for eth0:
        Supported ports: [ MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 3
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes
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