This bug still occurs even with Kernel 4.0 RC7. [ 29.599327] ------------[ cut here ]------------ [ 29.599357] WARNING: CPU: 0 PID: 931 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:1260 assert_plane.constprop.85+0x7a/0xb0 [i915]() [ 29.599358] plane A assertion failure (expected on, current off) [ 29.599381] Modules linked in: ctr ccm binfmt_misc rfcomm bnep nls_iso8859_1 arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_codec_hdmi iwlmvm snd_hda_codec_realtek snd_hda_codec_generic mac80211 uvcvideo videobuf2_vmalloc videobuf2_memops snd_hda_intel videobuf2_core v4l2_common snd_hda_controller videodev snd_hda_codec media iwlwifi snd_hwdep btusb joydev serio_raw thinkpad_acpi bluetooth snd_pcm cfg80211 nvram lpc_ich snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mei shpchp soundcore mac_hid parport_pc ppdev lp parport autofs4 dm_crypt crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse e1000e i2c_algo_bit drm_kms_helper ahci drm [ 29.599382] ptp libahci pps_core wmi video [ 29.599384] CPU: 0 PID: 931 Comm: Xorg Not tainted 4.0.0-040000rc7-generic #201504061936 [ 29.599385] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET25W (1.03 ) 12/01/2014 [ 29.599387] 00000000000004ec ffff88024165b6c8 ffffffff817e34d6 0000000000002112 [ 29.599388] ffff88024165b718 ffff88024165b708 ffffffff810791b7 ffff88024165b738 [ 29.599389] 0000000000000000 ffff88023f6e0000 ffff880036170800 ffff88023f6e0000 [ 29.599390] Call Trace: [ 29.599394] [] dump_stack+0x45/0x57 [ 29.599397] [] warn_slowpath_common+0x97/0xe0 [ 29.599399] [] warn_slowpath_fmt+0x46/0x50 [ 29.599419] [] assert_plane.constprop.85+0x7a/0xb0 [i915] [ 29.599436] [] hsw_disable_ips+0x5e/0x1b0 [i915] [ 29.599452] [] intel_crtc_disable_planes+0x48/0x150 [i915] [ 29.599468] [] haswell_crtc_disable+0x55/0x2d0 [i915] [ 29.599483] [] __intel_set_mode+0x1b8/0x3e0 [i915] [ 29.599497] [] intel_crtc_set_config+0x408/0x4f0 [i915] [ 29.599511] [] ? drm_atomic_state_free+0x27/0x50 [drm] [ 29.599527] [] ? intel_atomic_commit+0xcc/0x100 [i915] [ 29.599546] [] ? drm_atomic_helper_plane_set_property+0x8d/0xc0 [drm_kms_helper] [ 29.599557] [] drm_mode_set_config_internal+0x66/0x110 [drm] [ 29.599563] [] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [ 29.599570] [] drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x80 [drm_kms_helper] [ 29.599575] [] drm_fb_helper_set_par+0x24/0x50 [drm_kms_helper] [ 29.599591] [] intel_fbdev_set_par+0x1a/0x60 [i915] [ 29.599594] [] fb_set_var+0x283/0x3a0 [ 29.599597] [] ? check_preempt_wakeup+0x110/0x210 [ 29.599599] [] fbcon_blank+0x1e4/0x2d0 [ 29.599602] [] do_unblank_screen.part.22+0xa0/0x180 [ 29.599604] [] do_unblank_screen+0x4c/0x80 [ 29.599606] [] complete_change_console+0x65/0xf0 [ 29.599607] [] vt_ioctl+0x110d/0x1190 [ 29.599616] [] ? drm_ioctl+0x9e/0x590 [drm] [ 29.599619] [] tty_ioctl+0x418/0x980 [ 29.599621] [] ? fsnotify+0x204/0x260 [ 29.599624] [] do_vfs_ioctl+0x75/0x320 [ 29.599626] [] ? vfs_write+0x196/0x1f0 [ 29.599628] [] ? __fget_light+0x25/0x70 [ 29.599630] [] SyS_ioctl+0x91/0xb0 [ 29.599632] [] system_call_fastpath+0x16/0x1b [ 29.599633] ---[ end trace 9dbfb71a503e8331 ]--- [ 300.980842] mce: [Hardware Error]: Machine check events logged [ 334.949063] ------------[ cut here ]------------ [ 334.949096] WARNING: CPU: 1 PID: 931 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:1260 assert_plane.constprop.85+0x7a/0xb0 [i915]() [ 334.949097] plane A assertion failure (expected on, current off) [ 334.949122] Modules linked in: ctr ccm binfmt_misc rfcomm bnep nls_iso8859_1 arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_codec_hdmi iwlmvm snd_hda_codec_realtek snd_hda_codec_generic mac80211 uvcvideo videobuf2_vmalloc videobuf2_memops snd_hda_intel videobuf2_core v4l2_common snd_hda_controller videodev snd_hda_codec media iwlwifi snd_hwdep btusb joydev serio_raw thinkpad_acpi bluetooth snd_pcm cfg80211 nvram lpc_ich snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mei shpchp soundcore mac_hid parport_pc ppdev lp parport autofs4 dm_crypt crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse e1000e i2c_algo_bit drm_kms_helper ahci drm [ 334.949125] ptp libahci pps_core wmi video [ 334.949128] CPU: 1 PID: 931 Comm: Xorg Tainted: G W 4.0.0-040000rc7-generic #201504061936 [ 334.949128] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET25W (1.03 ) 12/01/2014 [ 334.949131] 00000000000004ec ffff88024165b6c8 ffffffff817e34d6 0000000000002a68 [ 334.949132] ffff88024165b718 ffff88024165b708 ffffffff810791b7 ffff88024165b738 [ 334.949134] 0000000000000000 ffff88023f6e0000 ffff880036170800 ffff88023f6e0000 [ 334.949134] Call Trace: [ 334.949139] [] dump_stack+0x45/0x57 [ 334.949143] [] warn_slowpath_common+0x97/0xe0 [ 334.949145] [] warn_slowpath_fmt+0x46/0x50 [ 334.949167] [] assert_plane.constprop.85+0x7a/0xb0 [i915] [ 334.949186] [] hsw_disable_ips+0x5e/0x1b0 [i915] [ 334.949204] [] intel_crtc_disable_planes+0x48/0x150 [i915] [ 334.949221] [] haswell_crtc_disable+0x55/0x2d0 [i915] [ 334.949237] [] __intel_set_mode+0x1b8/0x3e0 [i915] [ 334.949255] [] intel_crtc_set_config+0x408/0x4f0 [i915] [ 334.949272] [] ? drm_atomic_state_free+0x27/0x50 [drm] [ 334.949291] [] ? intel_atomic_commit+0xcc/0x100 [i915] [ 334.949300] [] ? drm_atomic_helper_plane_set_property+0x8d/0xc0 [drm_kms_helper] [ 334.949312] [] drm_mode_set_config_internal+0x66/0x110 [drm] [ 334.949320] [] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [ 334.949328] [] drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x80 [drm_kms_helper] [ 334.949334] [] drm_fb_helper_set_par+0x24/0x50 [drm_kms_helper] [ 334.949352] [] intel_fbdev_set_par+0x1a/0x60 [i915] [ 334.949356] [] fb_set_var+0x283/0x3a0 [ 334.949359] [] ? update_curr+0x141/0x1f0 [ 334.949361] [] fbcon_blank+0x1e4/0x2d0 [ 334.949365] [] do_unblank_screen.part.22+0xa0/0x180 [ 334.949367] [] do_unblank_screen+0x4c/0x80 [ 334.949369] [] complete_change_console+0x65/0xf0 [ 334.949371] [] vt_ioctl+0x110d/0x1190 [ 334.949381] [] ? drm_ioctl+0x9e/0x590 [drm] [ 334.949384] [] ? update_curr+0x141/0x1f0 [ 334.949387] [] tty_ioctl+0x418/0x980 [ 334.949390] [] ? fsnotify+0x204/0x260 [ 334.949393] [] do_vfs_ioctl+0x75/0x320 [ 334.949396] [] ? vfs_write+0x196/0x1f0 [ 334.949398] [] ? __fget_light+0x25/0x70 [ 334.949401] [] SyS_ioctl+0x91/0xb0 [ 334.949403] [] system_call_fastpath+0x16/0x1b [ 334.949405] ---[ end trace 9dbfb71a503e8332 ]--- [ 339.170035] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun