• Registered: 2011-04-15
  • Posts: 1

Topic: libnfc extremely slow after updating to ubuntu 11.04 (Natty Narwhal)

I have an ACR122U reader, which used to work fine on ubuntu 10.10.

However, after switching to ubuntu 11.04 it has gotten horribly horribly slow. Even running a simple nfc-list can take a full minute, not to mention any read/write operations.

Does anybody have any clue as to what might be wrong or what I can do to fix it. I already compiled and installed the version from svn in the hopes that that might solve it.

  • rconty
  • Administrator
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  • Registered: 2009-04-22
  • Posts: 673

Re: libnfc extremely slow after updating to ubuntu 11.04 (Natty Narwhal)

Hello,

That's maybe related to PS/SC 'on-demand' launch.

ACR122 relies on PS/SC layer which is sometimes slow/boggus... Plus, the ACR122 is a bogus NFC device too...

Romuald Conty
  • Registered: 2011-09-14
  • Posts: 5

Re: libnfc extremely slow after updating to ubuntu 11.04 (Natty Narwhal)

Hello,

I have trouble with installation on 11.04. When I run nfc-list I get: No NFC device found.

I use 11.04 with 2.6.38-11
I have installed libusb-dev and libpcsclite-dev
dmesg tells me that the NFC device was attached to ttyUSB0
I use the ACR122U reader

Can you help me since you got it to work!

thanks

  • rconty
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  • Registered: 2009-04-22
  • Posts: 673

Re: libnfc extremely slow after updating to ubuntu 11.04 (Natty Narwhal)

Hello,

Try to install pcscd as your device need it.

Romuald Conty
  • jonan
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  • Registered: 2011-09-20
  • Posts: 1

Re: libnfc extremely slow after updating to ubuntu 11.04 (Natty Narwhal)

Also ran into this slow down issue on one of two Unbutu 11.04 machines.
The problem was the driver on the slow machine was not the latest version (Using the
ACR ccid driver rather than stock pcscd). Make sure you have  v1.0.2 installed. v1.0.1 crawls.

http://www.acs.com.hk/index.php?pid=dri … id=ACR122U

-Jonan