I discovered that changing a BIOS setting on my Crosshair V fotmula fix the USB problem. I fresh reinstalled oneiric beta 1 and installed all upgrades available since now. I'm currently running 3.0.0-12-generic kernel. In the northbridge BIOS menu I have "IOMMU MODE" item. This enable MMIO support. That is what on line help say about "IOMMU MODE". If I set "IOMMU MODE" to DISABLED and restart Oneiric than USB device connected to USB 2 or USB 3 start to work reliably.
Why this IOMMU MODE setting effect USB function? Is this an hardware bug or a Linux bug? Can I change this bug status to fixed? I hope someone can give answer to this questions! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/859137 Title: Motherboard AMD 990FX/SB950 usb don't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/859137/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
