Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 4697 at drivers/gpu/drm/i915/intel_display.c:7530 hsw_enable_pc8+0x5b8/0x660 [i915]()
SPLL enabled
Modules linked in: vhost_net vhost macvtap macvlan tun cpufreq_stats rfcomm fuse ccm ipt_MASQUERADE nf_nat_masquerade_ipv4 ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge stp llc 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 bnep dm_crypt arc4 intel_rapl x86_pkg_temp_thermal coretemp kvm_intel iTCO_wdt iTCO_vendor_support kvm vfat fat iwlmvm mac80211 snd_hda_codec_realtek snd_hda_codec_generic crct10dif_pclmul snd_hda_codec_hdmi uvcvideo crc32_pclmul crc32c_intel videobuf2_vmalloc snd_hda_intel videobuf2_core snd_hda_controller
 videobuf2_memops v4l2_common snd_hda_codec videodev snd_hwdep iwlwifi ghash_clmulni_intel snd_seq btusb media snd_seq_device snd_pcm bluetooth cfg80211 rtsx_pci_ms serio_raw memstick thinkpad_acpi lpc_ich i2c_i801 tpm_tis snd_timer snd tpm rfkill wmi soundcore mei_me mei intel_rst shpchp nfsd auth_rpcgss nfs_acl lockd grace sunrpc i915 rtsx_pci_sdmmc mmc_core e1000e i2c_algo_bit drm_kms_helper drm rtsx_pci ptp mfd_core pps_core video
CPU: 0 PID: 4697 Comm: kworker/0:4 Not tainted 3.18.3-201.fc21.x86_64 #1
Hardware name: LENOVO 20ARS19C05/20ARS19C05, BIOS GJET80WW (2.30 ) 10/20/2014
Workqueue: pm pm_runtime_work
 0000000000000000 0000000037bff6e1 ffff880255bb3b98 ffffffff8175da66
 0000000000000000 ffff880255bb3bf0 ffff880255bb3bd8 ffffffff81099181
 000000000000020c ffff88003fe20000 ffff8800d57a3b58 ffff8800d57a3b68
Call Trace:
 [<ffffffff8175da66>] dump_stack+0x46/0x58
 [<ffffffff81099181>] warn_slowpath_common+0x81/0xa0
 [<ffffffff810991f5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa016aa18>] hsw_enable_pc8+0x5b8/0x660 [i915]
 [<ffffffffa010a9b0>] intel_suspend_complete+0xf0/0x6b0 [i915]
 [<ffffffffa010b03f>] intel_runtime_suspend+0xcf/0x230 [i915]
 [<ffffffff813d498f>] pci_pm_runtime_suspend+0x5f/0x150
 [<ffffffff814b3cc5>] __rpm_callback+0x35/0x90
 [<ffffffff814b3d46>] rpm_callback+0x26/0xa0
 [<ffffffff814b4521>] rpm_suspend+0x121/0x630
 [<ffffffff810b24cd>] ? process_one_work+0x20d/0x400
 [<ffffffff814b553a>] pm_runtime_work+0x8a/0xc0
 [<ffffffff810b240d>] process_one_work+0x14d/0x400
 [<ffffffff810b2d9b>] worker_thread+0x6b/0x4a0
 [<ffffffff810b2d30>] ? rescuer_thread+0x2a0/0x2a0
 [<ffffffff810b7fea>] kthread+0xea/0x100
 [<ffffffff810b7f00>] ? kthread_create_on_node+0x1b0/0x1b0
 [<ffffffff817646fc>] ret_from_fork+0x7c/0xb0
 [<ffffffff810b7f00>] ? kthread_create_on_node+0x1b0/0x1b0