I have the same thing happen with a slightly different card.
On initial boot it goes to 1000 but after resume it will only connect at 100.
it must be forced with ethtool back to 1000 and then it works fine.
notice how the first run of ethtool shows that the 1000 speeds are
missing from the advertised link modes...
lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10
uname -a
Linux redyns 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009 i686
GNU/Linux
01:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit
Ethernet (rev 10)
Subsystem: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
I/O ports at b000 [size=256]
Memory at fa008000 (32-bit, non-prefetchable) [size=256]
[virtual] Expansion ROM at fc000000 [disabled] [size=128K]
Capabilities: [dc] Power Management version 2
Kernel driver in use: r8169
Kernel modules: r8169
sudo ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes
sudo ethtool -s eth1 speed 1000 duplex full
sudo ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes
--
network slowdown on Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
https://bugs.launchpad.net/bugs/407656
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