Re: 3.[34].x Reproducable [Firmware bug] message upon warm boot only

[Rus]

More info:

Tried to switch off the IOMMU in the BIOS:

3.4.1 boots, but onboard ethernet is not woking with the previously
posted net/sched/sch_generic.c:256 warning.
3.5-rc1 fails to boot due to AHCI timeouts

If the at the same time the USB3.0 controller is disabled in the BIOS
- for both kernels the USB keyboard do not work (the 3.5-rc1 can't
load the usb modules though) even in USB2.0 ports. If the USB3.0 is
enabled in the BIOS - the USB keyboard works only in USB3.0 ports -
the USB2.0 ports are failed with the device descriptor read errors. By
the way: people with the older kernels and older BIOS'es struggles
from the same problem on the same m/b -
http://www.spinics.net/lists/linux-usb/msg54761.html

After re-enabling the IOMMU the keyboard and ethernet became work
again. This is somewhat strange as week ago I've observed exact the
opposite behaviour - the Ethernet works only with IOMMU switched off.
USB was bugging as described - works only in USB3.0 ports. Seems like
some random bug hits the IOMMU subsystem or this motherboard need to
be thrown away.

As usual can supply any additional info.

Rus

-- 
SfinxSoft
http://sfinxsoft.com
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