NI Linux Device Drivers 2021 Q4 Known Issues


This document contains the NI Linux Device Drivers known issues that were discovered before and since the release of NI Linux Device Drivers 2021 Q4. Known issues are performance issues or technical bugs that NI has acknowledged exist within this version of the product.


Not every issue known to NI appears on this list; it is intended to show the most severe and common issues that you may encounter and provide workarounds when possible. Other technical issues that you may encounter could occur through normal product use or system compatibility issues. You may find more information on these issues in NI’s Product Documentation, Knowledgebase, or Community.

Bug Number

Legacy ID



1448861, 1482726, 1482726

System Crashes When NI Drivers Exceed the Default Max for iNotify Instances

When running code that initializes NI drivers, the system crashes. This may be because the NI drivers have requested more than the 128 iNotify instances that the default Linux kernel allows. The likelihood of encountering this issue increases as the number of installed drivers increases.


Increase the iNotify limit from the default 128 to a larger number, such as 12288.

You can increase the iNotify limit permanently with the following command: 
sudo touch /etc/sysctl.d/<Upper Limit>-max-user-instances.conf

Or you can increase the iNotify limit after every restart with this command:
sudo sysctl -w fs.inotify.max_user_instances=<Upper Limit>

Reported Version:

NI Linux Device Drivers 2021 Q3

Resolved Version:



Aug 10, 2021


NI Linux Device Drivers do not Support Sleep or Hibernate

NI device drivers may crash a Linux system if the system tries to sleep or hibernate while devices are in use.


There is no known workaround.

Reported Version:

NI Linux Device Drivers 2019

Resolved Version:



Nov 11, 2021

Final Time Issue Listed

Issues found in this section will not be listed in future known issues documents for this product.

There are currently no issues to list.

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Glossary of Terms


  • Bug ID - When an issue is reported to NI, you may be given this ID or find it on  You may also find IDs posted by NI on the discussion forums or in KnowledgeBase articles.
  • Legacy ID – An older issue ID that refers to the same issue.  You may instead find this issue ID in older known issues documents.
  • Description - A few sentences which describe the problem. The brief description given does not necessarily describe the problem in full detail.
  • Workaround - Possible ways to work around the problem.
  • Reported Version - The earliest version in which the issue was reported.
  • Resolved Version - Version in which the issue was resolved or was no longer applicable. "N/A" indicates that the issue has not been resolved.
  • Date Added - The date the issue was added to the document (not the reported date).