Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_display.c:9717 intel_check_page_flip+0xc6/0xd0 [i915]()
Kicking stuck page flip: queued at 28667, now 28671
Modules linked in: vfat fat nls_utf8 isofs rfcomm fuse ccm xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast 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 arc4 rtl8723be snd_hda_codec_hdmi snd_hda_codec_via btcoexist rtl8723_common uvcvideo rtl_pci videobuf2_vmalloc videobuf2_core rtlwifi snd_hda_codec_generic videobuf2_memops mac80211 v4l2_common snd_intel_sst_acpi snd_intel_sst_core videodev snd_soc_sst_mfld_platform
 intel_rapl snd_hda_intel snd_hda_controller snd_soc_core iTCO_wdt snd_hda_codec iTCO_vendor_support snd_compress snd_hwdep snd_seq snd_seq_device snd_pcm media coretemp btusb kvm_intel bluetooth cfg80211 kvm snd_timer snd soundcore rfkill rtsx_pci_ms memstick snd_soc_sst_acpi crc32_pclmul joydev crc32c_intel serio_raw mei_txe iosf_mbi i2c_i801 mei lpc_ich wmi nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc i915 rtsx_pci_sdmmc mmc_core i2c_algo_bit rtsx_pci uas drm_kms_helper usb_storage r8169 drm mii mfd_core video
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.5-200.fc21.i686+PAE #1
Hardware name: GIGABYTE Q21/Q21, BIOS 1.03.09RGI4 09/01/2014
 c0d289c7 87a3c330 00000000 f7039ec4 c0a7b04e f7039f08 f7039ef8 c0466a7b
 f83815f4 f7039f28 00000000 f837ea2c 000025f5 f8331496 000025f5 f8331496
 f68cd800 f72cf000 00000000 f7039f14 c0466aee 00000009 f7039f08 f83815f4
Call Trace:
 [<c0a7b04e>] dump_stack+0x41/0x52
 [<c0466a7b>] warn_slowpath_common+0x8b/0xc0
 [<f8331496>] ? intel_check_page_flip+0xc6/0xd0 [i915]
 [<f8331496>] ? intel_check_page_flip+0xc6/0xd0 [i915]
 [<c0466aee>] warn_slowpath_fmt+0x3e/0x60
 [<f8331496>] intel_check_page_flip+0xc6/0xd0 [i915]
 [<f82fed64>] valleyview_pipestat_irq_handler+0x1c4/0x1d0 [i915]
 [<f8303d11>] valleyview_irq_handler+0xa1/0x140 [i915]
 [<c04b4756>] handle_irq_event_percpu+0x76/0x190
 [<c04b489a>] handle_irq_event+0x2a/0x50
 [<c04b7370>] ? handle_level_irq+0xd0/0xd0
 [<c04b73cd>] handle_edge_irq+0x5d/0xf0
 [<c04146a2>] handle_irq+0x92/0xd0
 <IRQ>  [<c0413ecc>] do_IRQ+0x3c/0xd0
 [<c046acb9>] ? irq_exit+0x99/0xb0
 [<c0a80f73>] common_interrupt+0x33/0x38
 [<c093d659>] ? cpuidle_enter_state+0x59/0x170
 [<c093d854>] cpuidle_enter+0x14/0x20
 [<c04a0597>] cpu_startup_entry+0x2b7/0x340
 [<c0a77342>] rest_init+0x62/0x70
 [<c0dc9b66>] start_kernel+0x3d6/0x3ee
 [<c0dc92de>] i386_start_kernel+0x79/0x7d

Potential duplicate: bug 1207169