[  114.399715] ------------[ cut here ]------------
[  114.399738] WARNING: CPU: 3 PID: 955 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:1256 assert_plane.constprop.87+0x7b/0x90 [i915]()
[  114.399738] plane A assertion failure (expected on, current off)
[  114.399752] Modules linked in: ctr ccm binfmt_misc rfcomm bnep nls_iso8859_1 arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlmvm kvm_intel kvm mac80211 snd_hda_codec_realtek snd_hda_codec_generic btusb uvcvideo snd_hda_codec_hdmi videobuf2_vmalloc iwlwifi videobuf2_memops joydev videobuf2_core v4l2_common serio_raw videodev bluetooth thinkpad_acpi media snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm cfg80211 nvram snd_seq_midi snd_seq_midi_event lpc_ich snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mei soundcore shpchp mac_hid parport_pc ppdev lp parport autofs4 dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw i915 gf128mul glue_helper ablk_helper cryptd psmouse e1000e ahci i2c_algo_bit libahci ptp drm_kms_helper
[  114.399753]  pps_core drm wmi video
[  114.399755] CPU: 3 PID: 955 Comm: Xorg Not tainted 3.19.0-10-generic #10-Ubuntu
[  114.399756] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET25W (1.03 ) 12/01/2014
[  114.399757]  ffffffffc0648050 ffff88024200f728 ffffffff817c1125 0000000023502350
[  114.399758]  ffff88024200f778 ffff88024200f768 ffffffff8107595a ffff88024dc94278
[  114.399759]  0000000000000000 ffff88023fb10000 ffff880035c06800 ffff880035c06800
[  114.399759] Call Trace:
[  114.399763]  [<ffffffff817c1125>] dump_stack+0x45/0x57
[  114.399765]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
[  114.399766]  [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
[  114.399777]  [<ffffffffc05e43ab>] assert_plane.constprop.87+0x7b/0x90 [i915]
[  114.399788]  [<ffffffffc05ec441>] hsw_disable_ips+0x41/0x190 [i915]
[  114.399796]  [<ffffffffc05ec808>] intel_crtc_disable_planes+0x48/0x140 [i915]
[  114.399805]  [<ffffffffc05ed56f>] haswell_crtc_disable+0x4f/0x3c0 [i915]
[  114.399814]  [<ffffffffc05ee509>] __intel_set_mode+0xa59/0xc80 [i915]
[  114.399824]  [<ffffffffc05f518b>] intel_crtc_set_config+0xbfb/0xf70 [i915]
[  114.399833]  [<ffffffffc0437926>] drm_mode_set_config_internal+0x66/0x100 [drm]
[  114.399838]  [<ffffffffc04a4cd8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[  114.399842]  [<ffffffffc04a6d49>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[  114.399847]  [<ffffffffc04a6dc2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[  114.399857]  [<ffffffffc060123a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[  114.399859]  [<ffffffff814333ca>] fb_set_var+0x18a/0x410
[  114.399861]  [<ffffffff8127b7d5>] ? ext4_mark_iloc_dirty+0x435/0x7b0
[  114.399862]  [<ffffffff81429df9>] fbcon_blank+0x229/0x300
[  114.399864]  [<ffffffff81228200>] ? __find_get_block+0xf0/0x120
[  114.399866]  [<ffffffff814b99ba>] do_unblank_screen+0xba/0x1f0
[  114.399876]  [<ffffffff814b092a>] vt_ioctl+0x13ea/0x1460
[  114.399878]  [<ffffffff814a2771>] tty_ioctl+0x411/0xcb0
[  114.399880]  [<ffffffff8119cd01>] ? kzfree+0x31/0x40
[  114.399882]  [<ffffffff811d454e>] ? kfree+0x13e/0x150
[  114.399885]  [<ffffffff8120b2aa>] ? dput+0x2a/0x1c0
[  114.399886]  [<ffffffff81207920>] do_vfs_ioctl+0x2e0/0x4e0
[  114.399889]  [<ffffffff811f4f2e>] ? ____fput+0xe/0x10
[  114.399891]  [<ffffffff81092c2c>] ? task_work_run+0xbc/0xf0
[  114.399892]  [<ffffffff81207ba1>] SyS_ioctl+0x81/0xa0
[  114.399894]  [<ffffffff817c824d>] system_call_fastpath+0x16/0x1b
[  114.399895] ---[ end trace e69ffec2ee6921eb ]---
[  115.615660] vgaarb: this pci device is not a vga device
[  115.616561] vgaarb: this pci device is not a vga device
[  116.736563] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[  145.043689] ------------[ cut here ]------------
[  145.043718] WARNING: CPU: 2 PID: 3416 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:1256 assert_plane.constprop.87+0x7b/0x90 [i915]()
[  145.043719] plane A assertion failure (expected on, current off)
[  145.043739] Modules linked in: ctr ccm binfmt_misc rfcomm bnep nls_iso8859_1 arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlmvm kvm_intel kvm mac80211 snd_hda_codec_realtek snd_hda_codec_generic btusb uvcvideo snd_hda_codec_hdmi videobuf2_vmalloc iwlwifi videobuf2_memops joydev videobuf2_core v4l2_common serio_raw videodev bluetooth thinkpad_acpi media snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm cfg80211 nvram snd_seq_midi snd_seq_midi_event lpc_ich snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mei soundcore shpchp mac_hid parport_pc ppdev lp parport autofs4 dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw i915 gf128mul glue_helper ablk_helper cryptd psmouse e1000e ahci i2c_algo_bit libahci ptp drm_kms_helper
[  145.043741]  pps_core drm wmi video
[  145.043743] CPU: 2 PID: 3416 Comm: Xorg Tainted: G        W      3.19.0-10-generic #10-Ubuntu
[  145.043744] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET25W (1.03 ) 12/01/2014
[  145.043746]  ffffffffc0648050 ffff88021081b6f8 ffffffff817c1125 0000000025d025d0
[  145.043748]  ffff88021081b748 ffff88021081b738 ffffffff8107595a ffff880226079200
[  145.043749]  0000000000000000 ffff88023fb10000 ffff880035c06800 ffff880035c06800
[  145.043749] Call Trace:
[  145.043755]  [<ffffffff817c1125>] dump_stack+0x45/0x57
[  145.043757]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
[  145.043758]  [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
[  145.043776]  [<ffffffffc05e43ab>] assert_plane.constprop.87+0x7b/0x90 [i915]
[  145.043779]  [<ffffffff8101ffcf>] ? __switch_to_xtra+0x13f/0x170
[  145.043795]  [<ffffffffc05ec441>] hsw_disable_ips+0x41/0x190 [i915]
[  145.043809]  [<ffffffffc05ec808>] intel_crtc_disable_planes+0x48/0x140 [i915]
[  145.043822]  [<ffffffffc05ed56f>] haswell_crtc_disable+0x4f/0x3c0 [i915]
[  145.043836]  [<ffffffffc05ee509>] __intel_set_mode+0xa59/0xc80 [i915]
[  145.043851]  [<ffffffffc05f518b>] intel_crtc_set_config+0xbfb/0xf70 [i915]
[  145.043864]  [<ffffffffc0437926>] drm_mode_set_config_internal+0x66/0x100 [drm]
[  145.043871]  [<ffffffffc04a4cd8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[  145.043877]  [<ffffffffc04a6d49>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[  145.043883]  [<ffffffffc04a6dc2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[  145.043898]  [<ffffffffc060123a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[  145.043901]  [<ffffffff814333ca>] fb_set_var+0x18a/0x410
[  145.043904]  [<ffffffff8109ea29>] ? check_preempt_curr+0x89/0xa0
[  145.043906]  [<ffffffff810a5f98>] ? __enqueue_entity+0x78/0x80
[  145.043908]  [<ffffffff810ad960>] ? enqueue_entity+0x400/0xc30
[  145.043911]  [<ffffffff8101ffcf>] ? __switch_to_xtra+0x13f/0x170
[  145.043912]  [<ffffffff81429df9>] fbcon_blank+0x229/0x300
[  145.043915]  [<ffffffff810138df>] ? __switch_to+0x44f/0x5f0
[  145.043918]  [<ffffffff814b99ba>] do_unblank_screen+0xba/0x1f0
[  145.043920]  [<ffffffff814af4ad>] complete_change_console+0x5d/0xf0
[  145.043922]  [<ffffffff814b06ca>] vt_ioctl+0x118a/0x1460
[  145.043931]  [<ffffffffc042c98c>] ? drm_ioctl+0x8c/0x680 [drm]
[  145.043934]  [<ffffffff814a2771>] tty_ioctl+0x411/0xcb0
[  145.043936]  [<ffffffff81207920>] do_vfs_ioctl+0x2e0/0x4e0
[  145.043938]  [<ffffffff811f58c5>] ? __sb_end_write+0x35/0x70
[  145.043940]  [<ffffffff811f3332>] ? vfs_write+0x1b2/0x1f0
[  145.043942]  [<ffffffff81207ba1>] SyS_ioctl+0x81/0xa0
[  145.043944]  [<ffffffff817c824d>] system_call_fastpath+0x16/0x1b
[  145.043945] ---[ end trace e69ffec2ee6921ec ]---
[  154.258024] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun