Hi,
The problem is solved.
When “ls -l /dev/nvidia*” is run to see the nvidia permissions, the last permission of crw-rw----, the last minus sign, is ACL permission. When it is changed from - to +, “crw-rw—+” fixed the problem.
ACL permissions are checked with “getfacl /dev/nvidia*” command, and each permission is turned to rw. Then it is fixed.
-Yunus