https://bugzilla.kernel.org/show_bug.cgi?id=70651
--- Comment #11 from Alex Deucher alexdeucher@gmail.com --- I haven't had time to look into why that patch is not working for you, but as I said previously, accessing the board via sysfs or debugfs while it's powered off produces invalid results so even when I fix the patch, the only change will be feedback from debugfs. You can't actually change the power state of a powered off card. I'll post an updated patch as soon as I figure out why it's not working.