On Thu, 1 Mar 2007, Kok, Auke wrote:
> Linus Torvalds wrote:
> >
> > Ok, here's an interesting one: my e1000 card no longer worked for a while.
> >
> > The green link-light blinks on/off once a second, and in time to that, my
> > dmesg fills up with an endless supply of
> >
> > e1000: eth0: e1000_watchdog: NIC Link is Down
> > e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex, Flow
> > Control: None
> > e1000: eth0: e1000_watchdog: 10/100 speed: disabling TSO
> >
> > and networking obviously doesn't actually work.
>
> Just out of curiosity, which e1000 chipset+motherboard are you running this
> on?
The kernel prints out:
e1000: 0000:00:19.0: e1000_probe: (PCI Express:2.5Gb/s:Width x1)
00:16:76:c7:eb:fe
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
and lspci says:
00:19.0 Ethernet controller: Intel Corporation 82566DM Gigabit Network
Connection (rev 02)
Subsystem: Intel Corporation Unknown device 0001
Flags: bus master, fast devsel, latency 0, IRQ 506
Memory at e0400000 (32-bit, non-prefetchable) [size=128K]
Memory at e0424000 (32-bit, non-prefetchable) [size=4K]
I/O ports at 20c0 [size=32]
Capabilities: <access denied>
00: 86 80 4a 10 07 04 10 00 02 00 00 02 00 00 00 00
10: 00 00 40 e0 00 40 42 e0 c1 20 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 01 00
30: 00 00 00 00 c8 00 00 00 00 00 00 00 0b 01 00 00
It's an Intel system (Host bridge: Intel Corporation 82Q963/Q965) with
integrated graphics: PCI ID 8086:2990 (rev 02) for the host bridge.
DMI info isn't very interesting, but it's an all-Intel board:
OEM-specific Type
Strings:
Intel_ASF
Intel_ASF_001
..
Base Board Information
Manufacturer: Intel Corporation
Product Name: DQ965GF
Version: AAD41676-305
Serial Number: BQGF635009R2
...
BIOS Information
Vendor: Intel Corp.
Version: CO96510J.86A.4462.2006.0804.2059
Release Date: 08/04/2006
so it's all-intel chipset, all-intel board, and all-intel BIOS ;)
> there have been problems reported with AMT2 on several chipsets (AMT2 is
> not supported under linux, unlike AMT1), and having it enabled in the BIOS
> produces this phenomenon.
Is there some way to at least disable AMT2 from the Linux driver (ie I
assume this is some issue of Intel not documenting it all - but maybe you
can add a "turn off that bit" to the affected chip).
If I'm not the only one to see it, it's obviously not just my personal
ethernet switch bug, but apparently the e1000 becoming confused by some
link detection event (and powering down the switch probably just gets it
out of its confusion).
Linus
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