Re: ACS ACR122U not working: pn533_usb 1-1:1.0: NFC: Couldn't poweron...

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On Thu, May 17, 2018 at 03:17:01PM +0100, Carlos Manuel Santos wrote:
> Thank you for you quick reply. I didn't have the opportunity to test
> with older kernels, I'm afraid.
> I never built a kernel patch but I can give it a try! :)

Let's drag this back on the mailing list, it's better that way, as I'm
not the only USB developer here.

Anyway, I would recommend building and booting your own kernel first,
before trying to apply a patch.  Try downloading the 4.16.8 (or newer)
kernel from kernel.org, use the config file from your currently running
kernel (it can be found in /proc/config.gz) just copy it to the root of
your kernel source directory, uncompress it, and rename it to .config.

Then build and install it "like normal".  There are loads of tutorials
online for how to do this, and a whole free book as well (search for
Linux Kernel in a Nutshell).

I'll go work on the patch now...

thanks,

greg k-h
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