Description of problem:
All I did was turn the machine on. System auto reported a kernel error.

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 2 PID: 1099 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x201/0x210 [i915]()
vblank wait timed out
Modules linked in: rfcomm fuse 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 coretemp snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic kvm iTCO_wdt iTCO_vendor_support arc4 crct10dif_pclmul crc32_pclmul iwldvm ppdev mac80211 snd_hda_intel hp_wmi snd_hda_controller sparse_keymap snd_hda_codec btusb crc32c_intel bluetooth snd_hwdep tpm_infineon ghash_clmulni_intel snd_seq tpm_tis snd_seq_device iwlwifi cfg80211 tpm snd_pcm
 serio_raw parport_pc wmi sdhci_pci sdhci mmc_core parport rfkill snd_timer acpi_cpufreq snd soundcore mei_me mei lpc_ich mfd_core hp_accel lis3lv02d shpchp input_polldev intel_ips pata_pcmcia i915 i2c_algo_bit drm_kms_helper firewire_ohci drm e1000e yenta_socket firewire_core crc_itu_t ptp pps_core video
CPU: 2 PID: 1099 Comm: Xorg.bin Not tainted 3.17.4-301.fc21.x86_64 #1
Hardware name: Hewlett-Packard HP EliteBook 8440p/172A, BIOS 68CCU Ver. F.50 07/08/2014
 0000000000000000 00000000844140e5 ffff8800aac33a00 ffffffff8173f929
 ffff8800aac33a48 ffff8800aac33a38 ffffffff810970ad ffff880036320000
 0000000000071040 000000000000153f 00000000fffcd6b5 ffff8800b6a330e0
Call Trace:
 [<ffffffff8173f929>] dump_stack+0x45/0x56
 [<ffffffff810970ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8109712c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa0159e67>] ? gen5_read32+0x57/0xd0 [i915]
 [<ffffffffa0169dd1>] intel_wait_for_vblank+0x201/0x210 [i915]
 [<ffffffffa018c1bd>] intel_dp_link_down+0x18d/0x230 [i915]
 [<ffffffffa018cb06>] g4x_post_disable_dp+0x26/0xe0 [i915]
 [<ffffffffa017443c>] ironlake_crtc_disable+0xec/0x7d0 [i915]
 [<ffffffffa013eb52>] ? is_pin_display+0x22/0x60 [i915]
 [<ffffffffa016e801>] __intel_set_mode+0x7e1/0x16f0 [i915]
 [<ffffffffa0177126>] intel_set_mode+0x16/0x30 [i915]
 [<ffffffffa017827a>] intel_crtc_set_config+0xa9a/0xeb0 [i915]
 [<ffffffffa009fa34>] drm_mode_set_config_internal+0x64/0xe0 [drm]
 [<ffffffffa00a414b>] drm_mode_setcrtc+0x2ab/0x5b0 [drm]
 [<ffffffffa0095e6f>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff81220910>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff81220b71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81222d8d>] ? SyS_poll+0x6d/0x120
 [<ffffffff81746ae9>] system_call_fastpath+0x16/0x1b