Description of problem:
Random X hang-up of the system. 
However, I have no Nvidia card running currently on the system.

Additional info:
reporter:       libreport-2.6.4
NMI watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [Xorg:1292]
Modules linked in: fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw nct6775 hwmon_vid snd_hda_codec_realtek snd_hda_codec_generic intel_rapl iosf_mbi x86_pkg_temp_thermal snd_hda_codec_hdmi coretemp snd_hda_intel kvm_intel snd_hda_codec kvm snd_hda_core irqbypass snd_hwdep crct10dif_pclmul crc32_pclmul iTCO_wdt iTCO_vendor_support ppdev crc32c_intel nouveau snd_seq snd_seq_device snd_pcm snd_timer snd soundcore mxm_wmi
 wmi ttm nuvoton_cir rc_core lpc_ich parport_pc soc_button_array parport shpchp mei_me i2c_i801 mei tpm_tis tpm 8021q garp stp llc mrp i915 i2c_algo_bit drm_kms_helper e1000e drm serio_raw ptp pps_core fjes video i2c_dev
CPU: 1 PID: 1292 Comm: Xorg Not tainted 4.4.3-201.fc22.x86_64 #1
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./B85M Pro4, BIOS P2.40 07/27/2015
task: ffff8804111ada00 ti: ffff8800b6c20000 task.ti: ffff8800b6c20000
RIP: 0010:[<ffffffff813cdd20>]  [<ffffffff813cdd20>] ioread32+0x30/0x40
RSP: 0018:ffff8800b6c23900  EFLAGS: 00000296
RAX: 00000000ffffffff RBX: ffff8800b735cc00 RCX: 0000000000000000
RDX: ffff8800b6c23af0 RSI: ffffc9000461a804 RDI: ffffc90004009410
RBP: ffff8800b6c23920 R08: 0000000000000000 R09: ffff88041a8e6000
R10: ffffffffa0445640 R11: ffff8800b6c23af0 R12: ffff8800b735cc00
R13: 000000000061a804 R14: ffff88041a8e6b00 R15: ffffffffffffffff
FS:  00007fbc45b4f9c0(0000) GS:ffff88042e280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ab1474 CR3: 000000040a09d000 CR4: 00000000001406e0
Stack:
 ffffffffa03b2685 0000000000000000 ffff8800b735cc00 000000000061a804
 ffff8800b6c23930 ffffffffa03b21ff ffff8800b6c23988 ffffffffa03be5e4
 ffff88041a8e6000 0000015400000800 ffff88041b887a00 ffff8800b6c23af0
Call Trace:
 [<ffffffffa03b2685>] ? nv04_timer_read+0x25/0x70 [nouveau]
 [<ffffffffa03b21ff>] nvkm_timer_read+0xf/0x20 [nouveau]
 [<ffffffffa03be5e4>] nv50_dac_sense+0xf4/0x320 [nouveau]
 [<ffffffffa03c3067>] nv50_disp_root_mthd_+0x2b7/0x4a0 [nouveau]
 [<ffffffff810d351f>] ? sched_clock_cpu+0x8f/0xa0
 [<ffffffffa0367ff8>] nvkm_object_mthd+0x18/0x20 [nouveau]
 [<ffffffffa0368a52>] nvkm_oproxy_mthd+0x12/0x20 [nouveau]
 [<ffffffffa0367ff8>] nvkm_object_mthd+0x18/0x20 [nouveau]
 [<ffffffffa03668cd>] nvkm_ioctl_mthd+0x5d/0xb0 [nouveau]
 [<ffffffffa03671a7>] nvkm_ioctl+0x107/0x260 [nouveau]
 [<ffffffffa00132eb>] ? i2c_outb+0xdb/0x100 [i2c_algo_bit]
 [<ffffffffa03fc302>] nvkm_client_ioctl+0x12/0x20 [nouveau]
 [<ffffffffa0364041>] nvif_object_ioctl+0x41/0x50 [nouveau]
 [<ffffffffa03643fc>] nvif_object_mthd+0x13c/0x170 [nouveau]
 [<ffffffffa00135b4>] ? bit_xfer+0x214/0x4f0 [i2c_algo_bit]
 [<ffffffff8179ce02>] ? mutex_lock+0x12/0x30
 [<ffffffffa004fbb9>] ? _object_find+0x69/0xa0 [drm]
 [<ffffffffa0408e7f>] nv50_dac_detect+0x7f/0xb0 [nouveau]
 [<ffffffffa0405634>] nouveau_connector_detect+0x2d4/0x400 [nouveau]
 [<ffffffffa00fadb5>] drm_helper_probe_single_connector_modes_merge_bits+0x235/0x4d0 [drm_kms_helper]
 [<ffffffffa00fb063>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffffa005544f>] drm_mode_getconnector+0x31f/0x370 [drm]
 [<ffffffffa0047602>] drm_ioctl+0x152/0x540 [drm]
 [<ffffffffa0055130>] ? drm_mode_getcrtc+0x140/0x140 [drm]
 [<ffffffff8179ebde>] ? _raw_spin_unlock_irqrestore+0xe/0x10
 [<ffffffffa03f9d88>] nouveau_drm_ioctl+0x68/0xc0 [nouveau]
 [<ffffffff81240e98>] do_vfs_ioctl+0x298/0x480
 [<ffffffff81148b2b>] ? __audit_syscall_entry+0xab/0xf0
 [<ffffffff81336ee3>] ? security_file_ioctl+0x43/0x60
 [<ffffffff812410f9>] SyS_ioctl+0x79/0x90
 [<ffffffff8179f16e>] entry_SYSCALL_64_fastpath+0x12/0x71
Code: 03 00 77 25 48 81 ff 00 00 01 00 76 05 0f b7 d7 ed c3 55 48 c7 c6 0a af a9 81 48 89 e5 e8 19 ff ff ff b8 ff ff ff ff 5d c3 8b 07 <c3> 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 81 fe ff ff