Comment 3 for bug 1511011

Another one on an identical machine

kernel: [59124.999210] ------------[ cut here ]------------
kernel: [59124.999239] WARNING: CPU: 3 PID: 3881 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
kernel: [59124.999240] pipe state doesn't match!
kernel: [59124.999277] Modules linked in: vhost_net vhost macvtap macvlan ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables nls_iso8
859_1 ppdev snd_hda_codec_hdmi intel_rapl snd_hda_codec_realtek intel_soc_dts_iosf snd_hda_codec_generic intel_powerclamp coretemp punit_atom_debug serio_raw snd_hda_intel input_leds joydev snd
_hda_codec lpc_ich mei_txe snd_hda_core mei shpchp snd_hwdep iosf_mbi snd_soc_rt5640 snd_intel_sst_acpi snd_intel_sst_core snd_soc_rl6231 snd_soc_sst_mfld_platform snd_soc_core 8250_fintek parp
ort_pc snd_compress parport ac97_bus snd_pcm_dmaengine snd_pcm dw_dmac dw_dmac_core rfkill_gpio snd_timer snd i2c_designware_platform pwm_lpss_platform soundcore i2c_designware_core snd_soc_sst
_acpi mac_hid 8250_dw spi_pxa2xx_platform pwm_lpss kvm_intel kvm autofs4 btrfs xor raid6_pq jitterentropy_rng drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt hid_generic usbhid i915
 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd i2c_algo_bit drm_kms_helper psmouse drm r8169 ahci mii libahci video i2c_hid hid sdhci_acpi sdhci
kernel: [59124.999298] CPU: 3 PID: 3881 Comm: (agetty) Tainted: G W 4.2.0-16-generic #19-Ubuntu
kernel: [59124.999299] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900B-ITX, BIOS P1.70 11/04/2014
kernel: [59124.999303] 0000000000000000 00000000d805d5d7 ffff88008a4474f8 ffffffff817e8c09
kernel: [59124.999306] 0000000000000000 ffff88008a447550 ffff88008a447538 ffffffff8107b3c6
kernel: [59124.999309] ffff88008a447578 ffff88008a4475e0 ffff880138860800 0000000000000001
kernel: [59124.999309] Call Trace:
kernel: [59124.999313] [<ffffffff817e8c09>] dump_stack+0x45/0x57
kernel: [59124.999316] [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
kernel: [59124.999319] [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
kernel: [59124.999349] [<ffffffffc01fdb98>] ? intel_pipe_config_compare+0xb08/0xc60 [i915]
kernel: [59124.999377] [<ffffffffc01fdfb5>] check_crtc_state+0x2c5/0x440 [i915]
kernel: [59124.999410] [<ffffffffc0211d6d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
kernel: [59124.999439] [<ffffffffc0212f27>] intel_crtc_set_config+0x4c7/0x580 [i915]
kernel: [59124.999456] [<ffffffffc00a94c6>] drm_mode_set_config_internal+0x66/0x100 [drm]
kernel: [59124.999465] [<ffffffffc014b245>] drm_fb_helper_pan_display+0x95/0xe0 [drm_kms_helper]
kernel: [59124.999469] [<ffffffff81442b0d>] ? soft_cursor+0x1ad/0x230
kernel: [59124.999498] [<ffffffffc02202fa>] intel_fbdev_pan_display+0x1a/0x60 [i915]
kernel: [59124.999501] [<ffffffff81447a6f>] fb_pan_display+0xcf/0x160
kernel: [59124.999504] [<ffffffff81441ba0>] bit_update_start+0x20/0x50
kernel: [59124.999507] [<ffffffff8143ec93>] fbcon_switch+0x3b3/0x650
kernel: [59124.999511] [<ffffffff814d253c>] redraw_screen+0x1ac/0x2a0
kernel: [59124.999513] [<ffffffff814d2754>] csi_J+0x124/0x130
kernel: [59124.999516] [<ffffffff814d639d>] do_con_trol+0x15ed/0x16c0
kernel: [59124.999519] [<ffffffff814d663f>] do_con_write.part.23+0x1cf/0xa50
kernel: [59124.999522] [<ffffffff814c2745>] ? copy_termios+0x75/0x80
kernel: [59124.999525] [<ffffffff814c2e4d>] ? tty_mode_ioctl+0x1bd/0x4c0
kernel: [59124.999529] [<ffffffff814d6f5c>] con_write+0x5c/0x60
kernel: [59124.999531] [<ffffffff814bf3e8>] n_tty_write+0x1c8/0x500
kernel: [59124.999535] [<ffffffff810bcee0>] ? __wake_up_sync+0x20/0x20
kernel: [59124.999538] [<ffffffff814bb771>] tty_write+0x171/0x2d0
kernel: [59124.999541] [<ffffffff814bf220>] ? n_tty_open+0xe0/0xe0
kernel: [59124.999544] [<ffffffff811fc878>] __vfs_write+0x18/0x40
kernel: [59124.999546] [<ffffffff811fd206>] vfs_write+0xa6/0x1a0
kernel: [59124.999549] [<ffffffff811fc1bf>] ? do_sys_open+0x1bf/0x280
kernel: [59124.999551] [<ffffffff811fdef5>] SyS_write+0x55/0xc0
kernel: [59124.999555] [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
kernel: [59124.999557] ---[ end trace 89b789a4fba1dc43 ]---
kernel: [59716.734454] ------------[ cut here ]------------