I got the second quad core processor and installed it this weekend.
I built various kernels between the 3.2.0 series and the 3.10.2 series. I
traced the problem to a change in the file i2c-i801.c that occurred between
3.7.10 and 3.8.1 where they defaulted to enabling interrupts. I found some
leads in the kernel forums that suggested to disable the interrupts for
that driver. By creating a file in /etc/modprobe.d named i2c-i801.conf
with the line options i2c_i801 disable_features=0x10 the interrupts are
disabled, the problem goes away and the system loads correctly. This
apparently disables access to the SMBus which is what is causing the
problem.
from dmesg
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[ 16.754217] i801_smbus 0000:00:1f.3: Interrupt disabled by user
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lspci reports
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00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
Express Root Port 1 (rev 09)
00:1c.1 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
Express Root Port 2 (rev 09)
00:1d.0 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #1 (rev 09)
00:1d.1 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #2 (rev 09)
00:1d.2 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #3 (rev 09)
00:1d.3 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #4 (rev 09)
00:1d.7 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI
USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC
Interface Controller (rev 09)
00:1f.2 IDE interface: Intel Corporation 631xESB/632xESB/3100 Chipset SATA
IDE Controller (rev 09)
00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus
Controller (rev 09)
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If anybody needs more info I can get it
I also got to test the stock kernel on the following systems all of
which work correctly.
IBM x346 2x 3.2 Xeon
SUN V20Z 2x 2.2 Opteron
DELL 1850 2x 3.2 Xeon
HP DL380 2x 3.6 Xeon
HP DL385 2x 2.6 Opteron dual core
Pete
