I encounter this same problem, but every boot instead of on resume.
Problem originated in gutsy (I think), persists through hardy and
intrepid. It also caused the eth0,eth1,...,eth99 bug, but a fix for the
network device name rules found elsewhere resolved that. If that is a
sufficiently different issue then I will file a new bug.
lspci, trimmed
00:07.0 Bridge: nVidia Corporation MCP61 Ethernet (rev a2)
Subsystem: Giga-byte Technology Device e000
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 220
Region 0: Memory at f7004000 (32-bit, non-prefetchable) [size=4K]
Region 1: I/O ports at c800 [size=8]
Capabilities: <access denied>
Kernel driver in use: forcedeth
Kernel modules: forcedeth
dmesg, trimmed
[ 3.160371] forcedeth: Reverse Engineered nForce ethernet driver. Version
0.61.
[ 3.160763] ACPI: PCI Interrupt Link [APCH] enabled at IRQ 21
[ 3.160771] forcedeth 0000:00:07.0: PCI INT A -> Link[APCH] -> GSI 21
(level, low) -> IRQ 21
[ 3.160776] forcedeth 0000:00:07.0: setting latency timer to 64
[ 3.160807] forcedeth 0000:00:07.0: Invalid Mac address detected:
2f:d3:61:ea:0f:00
[ 3.160863] forcedeth 0000:00:07.0: Please complain to your hardware vendor.
Switching to a random MAC.
[ 3.681020] forcedeth 0000:00:07.0: ifname eth0, PHY OUI 0x732 @ 1, addr
00:00:6c:73:c9:cb
[ 3.681025] forcedeth 0000:00:07.0: highdma pwrctl mgmt timirq gbit lnktim
msi desc-v3
--
forcedeth changes MAC address after suspend/resume
https://bugs.launchpad.net/bugs/82108
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