[ 35.025601] WARNING: CPU: 0 PID: 1226 at /build/linux-lts-vivid-1roiHG/linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_display.c:10807 intel_modeset_check_state+0x494/0x650 [i915]() [ 35.025603] encoder's hw state doesn't match sw tracking (expected 0, found 1) [ 35.025604] Modules linked in: ctr ccm nvram msr bnep rfcomm bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media gpio_ich dell_wmi sparse_keymap snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic wl(POE) arc4 snd_hda_intel snd_hda_controller iwldvm snd_hda_codec mac80211 snd_hwdep dell_laptop dcdbas coretemp kvm joydev serio_raw snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer iwlwifi r852 sm_common nand r592 nand_ecc lpc_ich nand_bch bch nand_ids snd mtd memstick cfg80211 shpchp soundcore mac_hid parport_pc ppdev lp parport psmouse pata_acpi ahci libahci sdhci_pci firewire_ohci sdhci firewire_core crc_itu_t i915 tg3 ptp pps_core wmi i2c_algo_bit drm_kms_helper drm video [ 35.025641] CPU: 0 PID: 1226 Comm: Xorg Tainted: P W OE 3.19.0-42-generic #48~14.04.1-Ubuntu [ 35.025643] Hardware name: Dell Inc. XPS M1330 /0N6705, BIOS A15 12/26/2008 [ 35.025644] ffffffffc0239320 ffff8800d6cb7ae8 ffffffff817afcd5 0000000000000000 [ 35.025646] ffff8800d6cb7b38 ffff8800d6cb7b28 ffffffff81074dea ffff8800d6cb7b66 [ 35.025648] ffff8800360e7000 0000000000000001 ffff8800360e7360 ffff88003623a000 [ 35.025651] Call Trace: [ 35.025655] [] dump_stack+0x45/0x57 [ 35.025657] [] warn_slowpath_common+0x8a/0xc0 [ 35.025659] [] warn_slowpath_fmt+0x46/0x50 [ 35.025676] [] intel_modeset_check_state+0x494/0x650 [i915] [ 35.025694] [] intel_crtc_set_config+0xa94/0xf60 [i915] [ 35.025706] [] drm_mode_set_config_internal+0x6f/0x110 [drm] [ 35.025718] [] drm_mode_setcrtc+0xdd/0x5b0 [drm] [ 35.025727] [] drm_ioctl+0x1ec/0x660 [drm] [ 35.025731] [] do_vfs_ioctl+0x2f8/0x510 [ 35.025733] [] ? __sb_end_write+0x35/0x70 [ 35.025736] [] ? vfs_write+0x172/0x1f0 [ 35.025738] [] SyS_ioctl+0x81/0xa0 [ 35.025740] [] system_call_fastpath+0x16/0x1b [ 35.025742] ---[ end trace e85af7254c3ca44c ]--- [ 45.101771] audit_printk_skb: 105 callbacks suppressed