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Running into a really weird issue with a dualboot windows 10/windows 7 machine, with win10 installed as main OS and win7 on a secondary drive, with windows 10's fastboot disabled. Win10 is set as default boot option, and the boot menu is set to a 15 second timeout.

If I boot the machine and let it time out or pick win10 explicitly, everything is fine.

However, if I boot the machine (or restart from win10) and then pick windows 7, my keyboard lights turn off the moment windows 7 starts up, and neither my mouse nor keyboard work. Unplugging and then plugging them back in does not help. However, if I hard-reset the machine, get to the boot loader, pick windows 7, and then tell windows 7 to start in normal mode (the hard reset causes it to offer the safe mode vs normal mode startup options), suddenly the keyboard and mouse work perfectly fine.

Has anyone run into this before, or do they know what might be the cause of this rather odd win7 behaviour?

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    Wow, that's weird. Just an idea: did you try USB settings in BIOS? perhaps enable or disable Legacy USB.
    – user576053
    Jul 18, 2016 at 20:51
  • Excellent suggestion - it was set to enable legacy USB, switching it disabled made the problem go away. Although I have no idea why, since the same setting has different effects during win7 boot based on proper, real, regular loading, or "normal mode" loading...
    – Mike 'Pomax' Kamermans
    Jul 19, 2016 at 1:09

1 Answer 1

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Turns out Florian had the right idea: disabling legacy USB in the boot menu fixed the problem itself, so the keyboard and mouse now work on first boot into windows 7.

That said, why they don't work with legacy USB enabled on first boot into win7, but then do work after a hard reset, is still a complete mystery.

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    Glad it worked for you mate :)
    – user576053
    Jul 20, 2016 at 1:02

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