Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_display.c:9713 intel_check_page_flip+0xdb/0xf0 [i915]()
Kicking stuck page flip: queued at 230751, now 230756
Modules linked in: nls_utf8 isofs ccm rfcomm fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun 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 vfat fat intel_rapl uvcvideo videobuf2_vmalloc videobuf2_core videobuf2_memops coretemp v4l2_common mceusb videodev rc_core kvm_intel media iTCO_wdt uas kvm iTCO_vendor_support arc4 rtl8723be snd_hda_codec_hdmi usb_storage snd_hda_codec_via snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_intel_sst_acpi
 snd_soc_rt5640 snd_hda_codec snd_intel_sst_core snd_soc_rl6231 snd_soc_sst_mfld_platform snd_soc_core btcoexist snd_compress snd_hwdep crct10dif_pclmul rtl8723_common rtl_pci rtlwifi btusb bluetooth mac80211 crc32_pclmul snd_seq cfg80211 crc32c_intel snd_seq_device ghash_clmulni_intel snd_pcm joydev rtsx_pci_ms memstick snd_timer serio_raw snd mei_txe shpchp lpc_ich soundcore rfkill_gpio snd_soc_sst_acpi wmi iosf_mbi mei dw_dmac dw_dmac_core i2c_hid regmap_i2c rfkill i2c_designware_platform i2c_designware_core i2c_i801 nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc i915 rtsx_pci_sdmmc i2c_algo_bit drm_kms_helper r8169 drm rtsx_pci mii mfd_core sdhci_acpi sdhci video mmc_core
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.3-200.fc21.x86_64 #1
Hardware name: GIGABYTE Q21/Q21, BIOS 1.03.09RGI4 09/01/2014
 0000000000000000 9881ad667cc59f05 ffff88023fc03ce8 ffffffff8176e215
 0000000000000000 ffff88023fc03d40 ffff88023fc03d28 ffffffff8109bc1a
 ffff88023fc03d28 ffff88003f846000 ffff880233b03000 0000000000000000
Call Trace:
 <IRQ>  [<ffffffff8176e215>] dump_stack+0x45/0x57
 [<ffffffff8109bc1a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff8109bca5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa017a4bb>] intel_check_page_flip+0xdb/0xf0 [i915]
 [<ffffffffa0143656>] valleyview_pipestat_irq_handler+0x206/0x210 [i915]
 [<ffffffffa0148e61>] valleyview_irq_handler+0xc1/0x170 [i915]
 [<ffffffff810f2a47>] handle_irq_event_percpu+0x77/0x1a0
 [<ffffffff810f2bab>] handle_irq_event+0x3b/0x60
 [<ffffffff810f5d6e>] handle_edge_irq+0x6e/0x120
 [<ffffffff81017414>] handle_irq+0x74/0x140
 [<ffffffff8109f591>] ? _local_bh_enable+0x21/0x50
 [<ffffffff8177777f>] do_IRQ+0x4f/0xf0
 [<ffffffff8177556d>] common_interrupt+0x6d/0x6d
 <EOI>  [<ffffffff81609b16>] ? cpuidle_enter_state+0x66/0x160
 [<ffffffff81609b01>] ? cpuidle_enter_state+0x51/0x160
 [<ffffffff81609cf7>] cpuidle_enter+0x17/0x20
 [<ffffffff810de101>] cpu_startup_entry+0x321/0x3c0
 [<ffffffff81764497>] rest_init+0x77/0x80
 [<ffffffff81d4f02c>] start_kernel+0x4a4/0x4c5
 [<ffffffff81d4e120>] ? early_idt_handlers+0x120/0x120
 [<ffffffff81d4e4d7>] x86_64_start_reservations+0x2a/0x2c
 [<ffffffff81d4e62b>] x86_64_start_kernel+0x152/0x175

Potential duplicate: bug 1207169