Comment 4 for bug 1436590

[ 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