Description of problem:
just on boot

Additional info:
reporter:       libreport-2.3.0
kernel BUG at drivers/gpu/drm/drm_crtc.c:536!
invalid opcode: 0000 [#1] SMP 
Modules linked in: ccm rfcomm fuse tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 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 binfmt_misc bnep intel_rapl arc4 iosf_mbi ppdev x86_pkg_temp_thermal coretemp kvm_intel dell_wmi sparse_keymap iTCO_wdt iTCO_vendor_support kvm uvcvideo dell_laptop dcdbas videobuf2_vmalloc iwlmvm mac80211 i8k crct10dif_pclmul crc32_pclmul crc32c_intel btusb bluetooth videobuf2_core iwlwifi videobuf2_memops v4l2_common ghash_clmulni_intel
 dell_led videodev cfg80211 snd_hda_codec_realtek snd_hda_codec_generic serio_raw snd_hda_codec_hdmi media snd_hda_intel snd_soc_rt5640 sdhci_pci snd_hda_controller snd_soc_rl6231 snd_soc_core rfkill snd_hda_codec snd_compress snd_hwdep wmi snd_seq snd_seq_device snd_pcm parport_pc parport int3403_thermal snd_soc_sst_acpi int3400_thermal i2c_hid dw_dmac regmap_i2c dell_smo8800 dw_dmac_core lpc_ich mei_me i2c_designware_platform snd_timer i2c_designware_core int3402_thermal acpi_thermal_rel acpi_pad mfd_core mei snd processor_thermal_device shpchp i2c_i801 soundcore nfsd auth_rpcgss nfs_acl lockd grace sunrpc i915 i2c_algo_bit drm_kms_helper drm e1000e sdhci_acpi sdhci mmc_core ptp video pps_core
CPU: 2 PID: 725 Comm: systemd-logind Not tainted 3.19.3-200.fc21.x86_64 #1
Hardware name: Dell Inc. Latitude E7450/06HN6G, BIOS A03 04/10/2015
task: ffff8800b4237440 ti: ffff880387d30000 task.ti: ffff880387d30000
RIP: 0010:[<ffffffffa00b6439>]  [<ffffffffa00b6439>] drm_framebuffer_free_bug+0x9/0x10 [drm]
RSP: 0018:ffff880387d339c8  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880408b7c000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff880315e78b48
RBP: ffff880387d339c8 R08: ffff8800ae68dd70 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000020 R12: ffff880315e78b40
R13: ffff8800d5e3c400 R14: ffff88040885eb78 R15: ffff88040885b000
FS:  00007fd58ae1f8c0(0000) GS:ffff88041e500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1eb0dc23bf CR3: 0000000386419000 CR4: 00000000003407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff880387d339e8 ffffffffa00b832d ffff880408b7c000 ffff88040885e800
 ffff880387d33a28 ffffffffa0117e01 ffff880387d33ba8 ffff8800d5e3c400
 ffff88040885e800 ffff88040885b060 0000000000000080 ffff88040885b000
Call Trace:
 [<ffffffffa00b832d>] drm_plane_force_disable+0x9d/0xd0 [drm]
 [<ffffffffa0117e01>] restore_fbdev_mode+0x51/0xf0 [drm_kms_helper]
 [<ffffffffa0119ed9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
 [<ffffffffa0119f52>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
 [<ffffffffa01afc7a>] intel_fbdev_set_par+0x1a/0x60 [i915]
 [<ffffffff8140cc70>] fb_set_var+0x190/0x420
 [<ffffffff811b8aa5>] ? shmem_undo_range+0x3d5/0x6d0
 [<ffffffff810dd588>] ? __wake_up+0x48/0x60
 [<ffffffff814030bc>] fbcon_blank+0x25c/0x340
 [<ffffffff813251db>] ? cred_has_capability+0x6b/0x130
 [<ffffffff814874aa>] do_unblank_screen+0xba/0x1f0
 [<ffffffff8147e2b1>] vt_ioctl+0x13b1/0x1430
 [<ffffffff81470489>] tty_ioctl+0x409/0xc50
 [<ffffffff811d2b12>] ? unmap_region+0xe2/0x130
 [<ffffffff8122e298>] do_vfs_ioctl+0x2f8/0x500
 [<ffffffff8122e521>] SyS_ioctl+0x81/0xa0
 [<ffffffff81774a09>] system_call_fastpath+0x12/0x17
Code: c3 6b e1 4c 89 e7 e8 17 40 14 e1 48 83 c4 08 5b 41 5c 41 5d 5d c3 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  [<ffffffffa00b6439>] drm_framebuffer_free_bug+0x9/0x10 [drm]
 RSP <ffff880387d339c8>

Potential duplicate: bug 1205449