[bug #47406] GRUB2 detects constant addition of nonexistent USB devices

[Timothy Pearson]

URL:
  <http://savannah.gnu.org/bugs/?47406>

                 Summary: GRUB2 detects constant addition of nonexistent USB
devices
                 Project: GNU GRUB
            Submitted by: tpearson
            Submitted on: Mon 14 Mar 2016 05:51:05 AM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: None
         Planned Release: None

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Details:

When booted from coreboot on the KFSN4-DRE, KGPE-D16, or KCMA-D8 systems,
GRUB2 operates extremely slowly, constantly detecting new USB devices even
when no USB devices are actually present.  Verbose logging shows a continuous
stream of the following messages:

bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x303
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x100
bus/usb/ohci.c:1308: detect_dev status=0x303
bus/usb/ohci.c:1308: detect_dev status=0x100

This constant activity makes GRUB2 effectively unusable; USB keystrokes take
seconds to process per keystroke and booting from USB is all but impossible.

The affected chipsets thus far are:
nVidia CK804
AMD SB700




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