Additional info:
reporter:       libreport-2.1.10
WARNING: CPU: 0 PID: 664 at drivers/gpu/drm/drm_crtc.c:2029 drm_mode_set_config_internal+0xd6/0xe0 [drm]()
Modules linked in: nls_utf8 isofs snd_seq_dummy rfcomm rndis_host cdc_ether usbnet xt_CHECKSUM tun bnep bluetooth rfkill nf_conntrack_ftp nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE 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 tda10048 saa7134_dvb videobuf_dvb dvb_core it87 hwmon_vid kvm_amd kvm snd_hda_codec_hdmi tda18271 tda8290 snd_hda_codec_realtek k10temp snd_hda_intel tea5767 tuner rc_winfast saa7134 tveeprom videobuf_dma_sg sp5100_tco i2c_piix4 videobuf_core rc_core v4l2_common videodev media edac_core edac_mce_amd snd_hda_codec fuse serio_raw snd_hwdep microcode acpi_cpufreq snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer snd soundcore r8169 mii shpchp uinput binfmt_misc usb_storage ata_generic radeon pata_acpi pata_atiixp i2c_algo_bit drm_kms_helper ttm drm i2c_core
CPU: 0 PID: 664 Comm: Xorg Not tainted 3.12.5-200.fc19.x86_64 #1
Hardware name: Gigabyte Technology Co., Ltd. GA-MA74GM-S2H/GA-MA74GM-S2H, BIOS FD 06/14/2010
 0000000000000009 ffff8800cb8bbab8 ffffffff8166305a 0000000000000000
 ffff8800cb8bbaf0 ffffffff8106925d ffff8800cfad46a0 0000000000000000
 ffff880127048000 ffff8800cede0060 0000000000000080 ffff8800cb8bbb00
Call Trace:
 [<ffffffff8166305a>] dump_stack+0x45/0x56
 [<ffffffff8106925d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106933a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa0021266>] drm_mode_set_config_internal+0xd6/0xe0 [drm]
 [<ffffffffa005a641>] drm_fb_helper_set_par+0x71/0xf0 [drm_kms_helper]
 [<ffffffff81356a71>] fb_set_var+0x191/0x430
 [<ffffffff81365f2f>] ? bit_putcs+0x2ef/0x550
 [<ffffffff81362221>] fbcon_blank+0x1d1/0x2d0
 [<ffffffff813d6ac4>] do_unblank_screen+0xb4/0x1e0
 [<ffffffff813cc90a>] complete_change_console+0x5a/0xe0
 [<ffffffff813cd93e>] vt_ioctl+0xfae/0x1160
 [<ffffffff813c1675>] tty_ioctl+0x275/0xb80
 [<ffffffff8166d78c>] ? __do_page_fault+0x20c/0x540
 [<ffffffff811ee077>] ? fsnotify_put_event+0x57/0x90
 [<ffffffff811c0e9d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811b0c71>] ? __sb_end_write+0x31/0x60
 [<ffffffff811ae832>] ? vfs_write+0x172/0x1e0
 [<ffffffff811c10f1>] SyS_ioctl+0x81/0xa0
 [<ffffffff8166dace>] ? do_page_fault+0xe/0x10
 [<ffffffff816720a9>] system_call_fastpath+0x16/0x1b

Potential duplicate: bug 1045201