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Date: Fri, 8 Jun 2012 00:00:59 +0300 From: Rus <rus@...nxsoft.com> To: Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org Subject: Re: 3.[34].x Reproducable [Firmware bug] message upon warm boot only 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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