Found the issue.
In /system/build.prop on 1.5.13, change the line:
ro.product.manufacturer=unknown
to:
ro.product.manufacturer=samsung
Then reboot. Working beautifully for me now...currently streaming Serenity

.
Disclaimer: I don't know if the manufacturer was purposely set to "unknown" or if its simply an oversight, so proceed with caution I suppose.
Sent from my Nexus S using the miui-dev.com Forums App