Additional info:
reporter:       libreport-2.2.3
WARNING: CPU: 0 PID: 733 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
vblank wait timed out
Modules linked in: fuse 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 arc4 brcmsmac cordic brcmutil bnep b43 mmc_block mac80211 cfg80211 ssb dell_wmi iTCO_wdt sparse_keymap iTCO_vendor_support ppdev snd_hda_codec_hdmi dell_laptop dcdbas snd_hda_codec_idt snd_hda_codec_generic coretemp kvm_intel kvm snd_hda_intel crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hda_controller microcode snd_hda_codec serio_raw intel_ips i2c_i801 snd_hwdep snd_seq snd_seq_device cdc_ether usbnet cdc_acm cdc_wdm mii snd_pcm joydev btusb bluetooth bcma sdhci_pci rfkill sdhci snd_timer snd e1000e mmc_core soundcore ptp lpc_ich mfd_core shpchp pps_core tpm_tis wmi dell_smo8800 parport_pc tpm parport acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd sunrpc i915 i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core yenta_socket i2c_core crc_itu_t video
CPU: 0 PID: 733 Comm: Xorg Not tainted 3.16.3-200.fc20.x86_64 #1
Hardware name: Dell Inc. Latitude E6510/02K3Y4, BIOS A16 12/05/2013
 0000000000000000 000000003e64583b ffff88020d963b98 ffffffff81707091
 ffff88020d963be0 ffff88020d963bd0 ffffffff8108d0ad ffff880212280000
 0000000000071040 00000000000005f1 00000000fffbe06a ffff8802126430d8
Call Trace:
 [<ffffffff81707091>] dump_stack+0x45/0x56
 [<ffffffff8108d0ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8108d12c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa010573a>] ? gen5_read32+0x5a/0xd0 [i915]
 [<ffffffffa0114a69>] intel_wait_for_vblank+0x209/0x210 [i915]
 [<ffffffffa013466d>] intel_dp_link_down+0x18d/0x210 [i915]
 [<ffffffffa0134f4c>] g4x_post_disable_dp+0x2c/0xe0 [i915]
 [<ffffffffa011a724>] ironlake_crtc_disable+0xf4/0x930 [i915]
 [<ffffffffa0073dba>] ? drm_modeset_lock+0x6a/0xc0 [drm]
 [<ffffffff8170cd72>] ? mutex_lock+0x12/0x2f
 [<ffffffffa011ba17>] intel_crtc_update_dpms+0x67/0xa0 [i915]
 [<ffffffffa011f729>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa006aaff>] drm_mode_obj_set_property_ioctl+0x39f/0x3b0 [drm]
 [<ffffffffa006ab4f>] drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
 [<ffffffffa0059a6c>] drm_ioctl+0x1ec/0x660 [drm]
 [<ffffffff810f0238>] ? __call_rcu_nocb_enqueue+0xc8/0xd0
 [<ffffffff8136c060>] ? lockref_put_or_lock+0x50/0x80
 [<ffffffff812068a0>] do_vfs_ioctl+0x2e0/0x4a0
 [<ffffffff811f550e>] ? ____fput+0xe/0x10
 [<ffffffff81206ae1>] SyS_ioctl+0x81/0xa0
 [<ffffffff8170e6e9>] system_call_fastpath+0x16/0x1b