Additional info:
reporter:       libreport-2.2.3
kernel BUG at drivers/gpu/drm/drm_crtc.c:536!
invalid opcode: 0000 [#1] SMP 
Modules linked in: ccm tcp_lp rfcomm fuse ip6t_rpfilter cdc_acm ip6t_REJECT nf_reject_ipv6 xt_conntrack bnep 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 binfmt_misc arc4 iwldvm mac80211 snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller hid_logitech_hidpp snd_hda_codec intel_rapl snd_hwdep iosf_mbi snd_seq x86_pkg_temp_thermal coretemp snd_seq_device kvm_intel snd_pcm kvm crct10dif_pclmul crc32_pclmul iTCO_wdt iTCO_vendor_support crc32c_intel dell_wmi ppdev sparse_keymap dell_laptop dcdbas i8k
ghash_clmulni_intel joydev serio_raw i2c_i801 iwlwifi sdhci_pci sdhci cfg80211 e1000e mmc_core btusb bluetooth uvcvideo snd_timer videobuf2_vmalloc videobuf2_core videobuf2_memops v4l2_common rfkill videodev hid_logitech_dj mei_me snd media soundcore lpc_ich ptp mfd_core pps_core mei shpchp parport_pc parport dell_smo8800 nouveau i915 firewire_ohci firewire_core crc_itu_t mxm_wmi ttm i2c_algo_bit drm_kms_helper drm wmi video
CPU: 0 PID: 1241 Comm: Xorg Not tainted 3.19.3-100.fc20.x86_64 #1
Hardware name: Dell Inc. Precision M4700/082H3V, BIOS A09 05/20/2013
task: ffff880221f8e0e0 ti: ffff88021c78c000 task.ti: ffff88021c78c000
RIP: 0010:[<ffffffffa0026189>]  [<ffffffffa0026189>] drm_framebuffer_free_bug+0x9/0x10 [drm]
RSP: 0018:ffff88021c78f9c8  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88022255b400 RCX: 0000000000000000
RDX: 0000000000000040 RSI: 0000000000000000 RDI: ffff8802058423c8
RBP: ffff88021c78f9c8 R08: ffff880220caac70 R09: 0000000000000000
R10: ffffffffa003723e R11: 0000000000003246 R12: ffff8802058423c0
R13: ffff8800c9686378 R14: ffff8800370a8600 R15: 0000000000000080
FS:  00007fd68db0d9c0(0000) GS:ffff88022e200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014501d8 CR3: 0000000219211000 CR4: 00000000001407f0
Stack:
ffff88021c78f9e8 ffffffffa00277f5 ffff88022255b400 ffff8800c9686000
ffff88021c78fa28 ffffffffa00ec811 0000000000000007 ffff8800370a8600
ffff88003700e800 ffff8800c9686000 ffff88003700e860 0000000000000080
Call Trace:
[<ffffffffa00277f5>] drm_plane_force_disable+0xa5/0xd0 [drm]
[<ffffffffa00ec811>] restore_fbdev_mode+0x51/0xf0 [drm_kms_helper]
[<ffffffffa00ee7a9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[<ffffffffa00ee822>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[<ffffffffa0182d0a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[<ffffffff813aed45>] ? __percpu_counter_add+0x55/0x70
[<ffffffff813fde57>] fb_set_var+0x197/0x440
[<ffffffff8119f68e>] ? free_hot_cold_page_list+0x4e/0xa0
[<ffffffff813f4624>] fbcon_blank+0x1f4/0x2f0
[<ffffffff81477d38>] do_unblank_screen+0xb8/0x1f0
[<ffffffff8146eabe>] vt_ioctl+0x110e/0x1190
[<ffffffff81759383>] ? __slab_free+0x11c/0x28b
[<ffffffff81461388>] tty_ioctl+0x208/0xc50
[<ffffffff814afdcc>] ? vga_arb_release+0xcc/0x120
[<ffffffff81225448>] do_vfs_ioctl+0x2f8/0x4f0
[<ffffffff8113b234>] ? __audit_syscall_entry+0xb4/0x110
[<ffffffff81022cbc>] ? do_audit_syscall_entry+0x6c/0x70
[<ffffffff812256c1>] SyS_ioctl+0x81/0xa0
[<ffffffff81762389>] system_call_fastpath+0x12/0x17
Code: e1 48 89 df e8 69 d4 1c e1 48 83 c4 08 5b 41 5c 41 5d 5d c3 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 <0f> 0b 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 
RIP  [<ffffffffa0026189>] drm_framebuffer_free_bug+0x9/0x10 [drm]
RSP <ffff88021c78f9c8>

Potential duplicate: bug 1205449