Additional info:
reporter:       libreport-2.2.3
WARNING: CPU: 2 PID: 1684 at drivers/gpu/drm/i915/intel_display.c:9761 intel_modeset_check_state+0x5e1/0x790 [i915]()
encoder's hw state doesn't match sw tracking (expected 1, found 0)
Modules linked in: rfcomm fuse ipt_MASQUERADE xt_CHECKSUM tun nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd sunrpc fscache ccm 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 x86_pkg_temp_thermal coretemp kvm_intel kvm arc4 iwldvm mac80211 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media iTCO_wdt iTCO_vendor_support snd_hda_codec_hdmi iwlwifi snd_hda_codec_conexant snd_hda_codec_generic cfg80211 sdhci_pci sdhci mmc_core microcode serio_raw i2c_i801 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep btusb snd_seq bluetooth snd_seq_device snd_pcm lpc_ich mfd_core snd_timer shpchp e1000e mei_me ptp mei pps_core wmi thinkpad_acpi snd soundcore rfkill dm_crypt uas usb_storage i915 crct10dif_pclmul crc32_pclmul i2c_algo_bit crc32c_intel drm_kms_helper ghash_clmulni_intel drm i2c_core video
CPU: 2 PID: 1684 Comm: Xorg Not tainted 3.15.10-200.fc20.x86_64 #1
Hardware name: LENOVO 4174AQ5/4174AQ5, BIOS 8CET58WW (1.38 ) 07/18/2013
 0000000000000000 0000000018a1c3a4 ffff8800d27ebb70 ffffffff816ef9c8
------------[ cut here ]------------
 ffff8800d27ebbb8 ffff8800d27ebba8 ffffffff8108931d ffff8800d27ebc30
 0000000000000001 ffff88021084a000 ffff88021084a320 ffff880037659800
Call Trace:
 [<ffffffff816ef9c8>] dump_stack+0x45/0x56
 [<ffffffff8108931d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8108939c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa010cbe1>] intel_modeset_check_state+0x5e1/0x790 [i915]
 [<ffffffffa010ce25>] intel_set_mode+0x25/0x30 [i915]
 [<ffffffffa010dced>] intel_crtc_set_config+0x8ed/0xdc0 [i915]
 [<ffffffffa003f5a1>] drm_mode_set_config_internal+0x61/0xf0 [drm]
 [<ffffffffa0042b78>] drm_mode_setcrtc+0xe8/0x610 [drm]
 [<ffffffffa003ec82>] ? drm_modeset_unlock_all+0x52/0x60 [drm]
 [<ffffffffa0033a3c>] drm_ioctl+0x1ec/0x660 [drm]
 [<ffffffff811f9ac0>] do_vfs_ioctl+0x2e0/0x4a0
 [<ffffffff811e850e>] ? ____fput+0xe/0x10
 [<ffffffff811f9d01>] SyS_ioctl+0x81/0xa0
WARNING: CPU: 2 PID: 1684 at drivers/gpu/drm/i915/intel_display.c:9761 intel_modeset_check_state+0x5e1/0x790 [i915]()
 [<ffffffff8111fc16>] ? __audit_syscall_exit+0x1f6/0x2a0
 [<ffffffff816ffae9>] system_call_fastpath+0x16/0x1b