Additional info:
libreport version: 2.0.18
abrt_version:   2.0.18
cmdline:        BOOT_IMAGE=/boot/vmlinuz-3.6.6-1.fc17.i686 root=UUID=96c14c1f-5ba0-4043-b2d0-7b790f1b84be ro quiet rhgb
kernel:         3.6.6-1.fc17.i686

kernel_tainted_long:
:Proprietary module has not been loaded.
:Taint on warning.

backtrace:
:WARNING: at drivers/gpu/drm/i915/intel_display.c:1225 assert_pipe+0x94/0xa0 [i915]()
:Hardware name: Compaq 6910p
:pipe A assertion failure (expected on, current off)
:Modules linked in: ppp_deflate zlib_deflate bsd_comp ppp_async ppp_generic slhc rndis_wlan cdc_acm rndis_host cdc_ether usbnet mii tcp_diag inet_diag vfat fat ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat xt_CHECKSUM iptable_mangle bridge stp llc lockd sunrpc rfcomm bnep nf_conntrack_netbios_ns nf_conntrack_broadcast be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nf_conntrack_ipv4 ip6t_REJECT nf_defrag_ipv4 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter xt_state nf_conntrack ip6_tables fuse snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device arc4 iwl4965 btusb snd_pcm iwlegacy mac80211 cfg80211 coretemp ppdev parport_pc pata_pcmcia bluetooth iTCO_wdt snd_page_alloc snd_timer snd irda parport e1000e hp_accel hp_wmi sparse_keymap rfkill iTCO_vendor_support soundcore crc_ccitt microcode l
:is3lv02d input_polldev mei lpc_ich serio_raw vhost_net tun macvtap macvlan kvm_intel kvm uinput binfmt_misc firewire_ohci sdhci_pci firewire_core sdhci mmc_core crc_itu_t yenta_socket usb_storage ata_generic pata_acpi wmi i915 video i2c_algo_bit drm_kms_helper drm i2c_core
:Pid: 1046, comm: Xorg Tainted: G        W    3.6.6-1.fc17.i686 #1
:Call Trace:
: [<c043c602>] warn_slowpath_common+0x72/0xa0
: [<f80a3d14>] ? assert_pipe+0x94/0xa0 [i915]
: [<f80a3d14>] ? assert_pipe+0x94/0xa0 [i915]
: [<c043c6d3>] warn_slowpath_fmt+0x33/0x40
: [<f80a3d14>] assert_pipe+0x94/0xa0 [i915]
: [<f80a40b6>] intel_enable_plane+0x26/0x80 [i915]
: [<f80a4228>] i9xx_crtc_enable+0x118/0x150 [i915]
: [<f80a5166>] i9xx_crtc_dpms+0x16/0x30 [i915]
: [<f80a104f>] intel_crtc_dpms+0x3f/0x130 [i915]
: [<f7f8344f>] drm_helper_connector_dpms+0x5f/0x100 [drm_kms_helper]
: [<f80a1010>] ? ironlake_update_plane+0x280/0x280 [i915]
: [<f7fd413d>] drm_mode_obj_set_property_ioctl+0x36d/0x390 [drm]
: [<c0952a58>] ? mutex_lock+0x18/0x40
: [<f7fd4197>] drm_mode_connector_property_set_ioctl+0x37/0x50 [drm]
: [<c0c0c0c0>] ? register_lapic_address+0x52/0x8b
: [<f7fd4160>] ? drm_mode_obj_set_property_ioctl+0x390/0x390 [drm]
: [<f7fc4bf2>] drm_ioctl+0x422/0x480 [drm]
: [<f7fd4160>] ? drm_mode_obj_set_property_ioctl+0x390/0x390 [drm]
: [<c0671672>] ? vsnprintf+0x2d2/0x3c0
: [<c0530001>] ? free_loc_track.isra.46+0x31/0x40
: [<c0673a45>] ? __copy_to_user_ll+0x65/0x80
: [<c072ba53>] ? vga_arb_read+0x163/0x1c0
: [<f7fc47d0>] ? drm_copy_field+0x80/0x80 [drm]
: [<c055364a>] do_vfs_ioctl+0x7a/0x590
: [<c061903a>] ? inode_has_perm.isra.31.constprop.62+0x3a/0x50
: [<c061a680>] ? file_has_perm+0xa0/0xb0
: [<c05439f5>] ? vfs_read+0xe5/0x160
: [<c061aa18>] ? selinux_file_ioctl+0x48/0xe0
: [<c0553bc8>] sys_ioctl+0x68/0x80
: [<c095b75f>] sysenter_do_call+0x12/0x28