I now have a full solution for my remote problems. I bought an IR keyboard from ebay (http://tinyurl.com/6mf2fwm). After programming all necessary keys and adding xbmc as an activity, I can now fully control Linhes/Myth and XBMC.

Compared to the hair loss of trying to solve the remote issues under 7.2, the keyboard solution was easy. Please note that I changed the Linhes setup to no remote and default receiver. The only outstanding issue is that for some reason the remote receiver is not always detected on a reboot, but works fine from a cold start, i.e. shutdown and then startup. I am still looking into that minor issue.

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* Asus M3N78-EM, AMD 5050e, Nvidia 8300 IGP, QNAP TS-439 Pro II, Linhes 7.4

bios maybe? USB 1.1 vs 2.0 legacy mode maybe? Glad to hear you found a solution.

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My System

I found the solution was to add a powered usb hub. Maybe if I had played around with the MB voltages I could have solved the problem that way, but I had a spare cheap powered usb hub so I tried that and haven't had a problem since.

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* Asus M3N78-EM, AMD 5050e, Nvidia 8300 IGP, QNAP TS-439 Pro II, Linhes 7.4