Description of problem:
Happened at boot time.

Additional info:
reporter:       libreport-2.2.3
WARNING: CPU: 0 PID: 922 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210 [i915]()
vblank wait timed out
Modules linked in: tun ccm bnep bluetooth 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 fuse uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 iTCO_wdt iTCO_vendor_support ath5k ath mac80211 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec cfg80211 lpc_ich snd_hwdep mfd_core snd_seq snd_seq_device snd_pcm shpchp i2c_i801 toshiba_bluetooth joydev coretemp serio_raw toshiba_acpi sparse_keymap rfkill snd_timer snd wmi acpi_cpufreq soundcore hid_logitech_dj i915 i2c_algo_bit drm_kms_helper r8169 drm mii video ums_realtek uas usb_storage
CPU: 0 PID: 922 Comm: X Not tainted 3.17.2-200.fc20.x86_64 #1
Hardware name: TOSHIBA Satellite Pro L300/Portable PC, BIOS 2.20 12/09/2009
 0000000000000000 00000000f01f40c5 ffff8800a9db7a70 ffffffff817271cc
 ffff8800a9db7ab8 ffff8800a9db7aa8 ffffffff81094ced ffff880036410000
 0000000000071040 00000000000013d3 00000000ffffd7dd 00000000000000aa
Call Trace:
 [<ffffffff817271cc>] dump_stack+0x45/0x56
 [<ffffffff81094ced>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff81094d6c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa0103afb>] ? gen4_read32+0x4b/0xc0 [i915]
 [<ffffffffa0114169>] intel_wait_for_vblank+0x209/0x210 [i915]
 [<ffffffffa014fb65>] intel_tv_detect+0x245/0x5c0 [i915]
 [<ffffffffa013a546>] ? intel_dp_detect+0x126/0x220 [i915]
 [<ffffffffa00abb03>] drm_helper_probe_single_connector_modes_merge_bits+0x2c3/0x3d0 [drm_kms_helper]
 [<ffffffffa00abc23>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffffa004958f>] drm_mode_getconnector+0x3ff/0x470 [drm]
 [<ffffffffa003be0c>] drm_ioctl+0x1ec/0x660 [drm]
 [<ffffffff81214830>] do_vfs_ioctl+0x2e0/0x4a0
 [<ffffffff81214a71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81131116>] ? __audit_syscall_exit+0x1f6/0x2a0
 [<ffffffff8172e869>] system_call_fastpath+0x16/0x1b