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[bug #37470] Wacom Intuos4 prevents GRUB from responding to USB keyboard

From: Sean Santos
Subject: [bug #37470] Wacom Intuos4 prevents GRUB from responding to USB keyboard
Date: Sun, 30 Sep 2012 03:08:04 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120908 Firefox/15.0.1


                 Summary: Wacom Intuos4 prevents GRUB from responding to USB
                 Project: GNU GRUB
            Submitted by: quantheory
            Submitted on: Sun 30 Sep 2012 03:08:04 AM GMT
                Category: User Interface
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
         Reproducibility: Intermittent
         Planned Release: None



I got a new computer last April, and I found that GRUB usually (more than 90%
of the time) does not respond to my USB keyboard in any way. I tried a few
things to fix this, including:

- Switching between USB 2.0 and USB 3.0 ports
- Changing BIOS options (particularly toggling USB legacy support)
- Unplugging USB hubs

I eventually found that the problem was my Wacom tablet. With it plugged in,
the keyboard *almost* never works in GRUB, but with it removed, the problem
has *never* occurred.

The keyboard works in the BIOS, in Linux (I've run Ubuntu and Gentoo on this
box so far) and in Windows, and in the Grub Legacy and Windows bootloaders,
regardless of whether the Wacom tablet is present.

This leads me to believe that this is an issue specific to GRUB 2 and the
tablet. I figured that I should report it, but I don't know what else I could
do/mention that would be helpful.


Version: GRUB 2 rc1 (problem existed on previous GRUB 2 betas, including
Motherboard: eVGA Z68 FTW (Intel Z68 chipset)
Operating systems: Gentoo (kernels from 3.3-3.5)
                   Windows 7
                   (previously, Ubuntu Precise)
Tablet: Wacom Intuos4
Keyboard: Kinesis Freestyle
          (but problem affects other keyboards)


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