Description of problem:
Had 178 of these errors  occur during 20 minutes of screen lock.

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 1234 at drivers/gpu/drm/i915/intel_pm.c:6317 intel_display_power_put+0x14c/0x160 [i915]()
Modules linked in: vhost_net vhost macvtap macvlan tun rfcomm fuse ccm xt_CHECKSUM ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT 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 arc4 iwlmvm x86_pkg_temp_thermal coretemp kvm_intel mac80211 kvm uvcvideo iwlwifi iTCO_wdt iTCO_vendor_support videobuf2_vmalloc videobuf2_memops crct10dif_pclmul crc32_pclmul cfg80211 crc32c_intel videobuf2_core v4l2_common ghash_clmulni_intel btusb videodev bluetooth snd_hda_codec_via
 media snd_hda_codec_hdmi snd_hda_codec_generic serio_raw i2c_i801 snd_hda_intel rtsx_pci_ms rfkill snd_hda_controller memstick snd_hda_codec lpc_ich tpm_infineon tpm_tis tpm snd_hwdep wmi snd_seq snd_seq_device snd_pcm snd_timer snd mei_me mei ie31200_edac soundcore edac_core shpchp i915 rtsx_pci_sdmmc mmc_core i2c_algo_bit drm_kms_helper drm r8169 rtsx_pci mfd_core mii video
CPU: 0 PID: 1234 Comm: Xorg.bin Not tainted 3.17.4-301.fc21.x86_64 #1
Hardware name: System76, Inc.                   Kudu Professional               /Kudu Professional              , BIOS 1.03.03RS76 01/15/2014
 0000000000000000 00000000fff6e26a ffff8803f3943c70 ffffffff8173f929
 0000000000000000 ffff8803f3943ca8 ffffffff810970ad ffff880404fe002c
 000000000000000b ffff880404fe8610 0000000000000001 ffff880404fe0000
Call Trace:
 [<ffffffff8173f929>] dump_stack+0x45/0x56
 [<ffffffff810970ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810971da>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa011933c>] intel_display_power_put+0x14c/0x160 [i915]
 [<ffffffffa0164e53>] intel_crtc_control+0x83/0x100 [i915]
 [<ffffffffa0164f37>] intel_crtc_update_dpms+0x67/0x80 [i915]
 [<ffffffffa016e0f9>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa0073389>] drm_mode_obj_set_property_ioctl+0x399/0x3a0 [drm]
 [<ffffffffa00733cf>] drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
 [<ffffffffa0063e6f>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff81310da9>] ? avc_has_perm+0xd9/0x1a0
 [<ffffffff813f36fe>] ? brightness_store+0xee/0x120
 [<ffffffff8124c87c>] ? fsnotify+0x28c/0x370
 [<ffffffff81220910>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff81220b71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81222d8d>] ? SyS_poll+0x6d/0x120
 [<ffffffff81746ae9>] system_call_fastpath+0x16/0x1b