Description of problem:
This problem accurs because selinux is enabled.  It can be reproduced bu installing the NVIDIA drivers.

Why can't nvidia-modprobe have the access to the nvidiactl directory by default?
SELinux is preventing /usr/bin/nvidia-modprobe from 'add_name' accesses on the directory nvidiactl.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that nvidia-modprobe should be allowed add_name access on the nvidiactl directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep nvidia-modprobe /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:object_r:device_t:s0
Target Objects                nvidiactl [ dir ]
Source                        nvidia-modprobe
Source Path                   /usr/bin/nvidia-modprobe
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-128.18.fc22.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.2.5-201.fc22.x86_64 #1 SMP Wed
                              Oct 28 20:00:23 UTC 2015 x86_64 x86_64
Alert Count                   8
First Seen                    2015-11-12 12:26:13 CST
Last Seen                     2015-11-13 11:20:34 CST
Local ID                      c536224b-7e2a-416b-9333-a951c6b2de85

Raw Audit Messages
type=AVC msg=audit(1447435234.797:546): avc:  denied  { add_name } for  pid=2075 comm="nvidia-modprobe" name="nvidiactl" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=dir permissive=0


type=SYSCALL msg=audit(1447435234.797:546): arch=x86_64 syscall=mknod success=no exit=EACCES a0=7ffe7d48d110 a1=21b6 a2=c3ff a3=5c2 items=0 ppid=2060 pid=2075 auid=4294967295 uid=42 gid=42 euid=0 suid=0 fsuid=0 egid=42 sgid=42 fsgid=42 tty=tty1 ses=4294967295 comm=nvidia-modprobe exe=/usr/bin/nvidia-modprobe subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)

Hash: nvidia-modprobe,xdm_t,device_t,dir,add_name

Version-Release number of selected component:
selinux-policy-3.13.1-128.18.fc22.noarch

Additional info:
reporter:       libreport-2.6.3
hashmarkername: setroubleshoot
kernel:         4.2.5-201.fc22.x86_64
type:           libreport