Additional info:
WARNING: at drivers/gpu/drm/i915/intel_display.c:1259 intel_disable_pipe+0xe1/0x180 [i915]()
Hardware name: Latitude E6320
plane A assertion failure, should be disabled but not
Modules linked in: fuse ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat xt_CHECKSUM iptable_mangle bridge stp llc lockd rfcomm bnep ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ip6table_filter ip6_tables ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_hda_codec arc4 iwldvm snd_hwdep snd_seq mac80211 btusb snd_seq_device bluetooth snd_pcm uvcvideo iwlwifi snd_page_alloc snd_timer snd cfg80211 rfkill iTCO_wdt iTCO_vendor_support lpc_ich ppdev parport_pc videobuf2_vmalloc videobuf2_memops videobuf2_core videodev mei media soundcore mfd_core parport i2c_i801 coretemp dell_laptop dell_wmi sparse_keymap microcode dcdbas vhost_net tun macvtap macvlan kvm_intel kvm binfmt_misc uinput crc32c_intel ghash_clmulni_intel sdhci_pci sdhci mmc_core e1000e wmi i915 video i2c_algo_bit drm_kms_helper drm i2c_core sunrpc be2iscsi bnx2i cnic uio cxgb4i c
xgb4 cxgb3i cxgb3 mdio libcxgbi libiscsi_tcp qla4xxx iscsi_boot_sysfs libiscsi scsi_transport_iscsi
Pid: 2226, comm: kworker/0:0 Not tainted 3.6.6-1.fc17.x86_64 #1
Call Trace:
 [<ffffffff8105b8ef>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff8105b9e6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa01e90b1>] intel_disable_pipe+0xe1/0x180 [i915]
 [<ffffffffa01ea898>] ironlake_crtc_disable+0x98/0x790 [i915]
 [<ffffffffa01eb03e>] ironlake_crtc_prepare+0xe/0x10 [i915]
 [<ffffffffa01b9fa9>] drm_crtc_helper_set_mode+0x2c9/0x500 [drm_kms_helper]
 [<ffffffff8135693b>] ? acpi_ps_delete_parse_tree+0x2f/0x64
 [<ffffffffa01ba253>] drm_helper_resume_force_mode+0x73/0x170 [drm_kms_helper]
 [<ffffffffa01f2ec0>] intel_lid_notify+0xb0/0xd0 [i915]
 [<ffffffff816216fd>] notifier_call_chain+0x4d/0x70
 [<ffffffff81085528>] __blocking_notifier_call_chain+0x58/0x80
 [<ffffffff81085566>] blocking_notifier_call_chain+0x16/0x20
 [<ffffffff8135e53e>] acpi_lid_send_state+0x81/0xb1
 [<ffffffff8135e9c5>] acpi_button_notify+0x3d/0xaa
 [<ffffffff8133a7b1>] acpi_device_notify+0x19/0x1b
 [<ffffffff813471e5>] acpi_ev_notify_dispatch+0x41/0x5c
 [<ffffffff81337985>] acpi_os_execute_deferred+0x25/0x32
 [<ffffffff81077cb7>] process_one_work+0x147/0x4a0
 [<ffffffff81337960>] ? acpi_os_wait_events_complete+0x23/0x23
 [<ffffffff81079a1e>] worker_thread+0x15e/0x480
 [<ffffffff810798c0>] ? manage_workers+0x2f0/0x2f0
 [<ffffffff8107ede3>] kthread+0x93/0xa0
 [<ffffffff816269c4>] kernel_thread_helper+0x4/0x10
 [<ffffffff8107ed50>] ? kthread_freezable_should_stop+0x70/0x70
 [<ffffffff816269c0>] ? gs_change+0x13/0x13