Public bug reported:
I'm using an ACR122U-A9 NFC reader with libacsccid1 (acsccid
1.1.10-1build1) and pcsc-lite (2.0.3-1build1) on Ubuntu 24.04.2 LTS.
When plugging in the reader the kernel automatically inserts the
pn533/pn533_usb modules. When those modules are loaded the reader can't
be used with any application using the PC/SC API, such as pcsc_scan.
As a user I expect my NFC reader to be usable with PC/SC applications
such as pcsc_scan after installing pcscd, pcsc-tools and libacsccid1,
and running pcscd. And if it's not possible to accomplish then I expect
the user to be informed that additional configuration is required. As of
now I can't even find any information in
/usr/share/doc/libacsccid1/README.*
The current behavior is that when pcscd, pcsc-tools and libacsccid1 have
been installed, and the pcscd daemon is running, and you plug in an
ACR122U-A9 NFC reader, and then run pcsc_scan it can't find the reader.
It can be solved with the following blacklist:
/etc/modprobe.d/blacklist-libacsccid1.conf
blacklist pn533
blacklist pn533_usb
BTW the package libnfc6 which provides another NFC API does have a
similar blacklist. But it also contains "blacklist nfc" which might not
be necessary. And the file isn't versioned (/etc/modprobe.d/blacklist-
libnfc.conf), which I thought it should be since it's in a shared
library package that's versioned).
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: libacsccid1 1.1.10-1build1
ProcVersionSignature: Ubuntu 6.8.0-59.61-generic 6.8.12
Uname: Linux 6.8.0-59-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu3.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sat May 24 11:23:28 2025
InstallationDate: Installed on 2020-08-19 (1739 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: acsccid
UpgradeStatus: Upgraded to noble on 2025-01-08 (135 days ago)
** Affects: acsccid (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
** Attachment added: "Blacklist pn533 and pn533_usb"
https://bugs.launchpad.net/bugs/2111640/+attachment/5880082/+files/blacklist-libacsccid1.conf
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https://bugs.launchpad.net/bugs/2111640
Title:
Consider blacklisting the pn533 kernel driver
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