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[Bug 1597267] Re: ThinkPad X260 connecting external DisplayPort hangs system


Note that compared to #1559308 , connecting the same monitor via the
HDMI port on the laptop running 4.4.0-28-generic does seem to work fine:

There's still some stuff in dmesg when using HDMI as well:

snd_hda_codec_hdmi hdaudioC0D2: HDMI: ELD buf size is 0, force 128
snd_hda_codec_hdmi hdaudioC0D2: HDMI: invalid ELD data byte 0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1080 at /build/linux-BvkamA/linux-4.4.0/ubuntu/i915/intel_pm.c:3586 skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
Modules linked in:
 ctr ccm rfcomm bnep arc4 snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core intel_rapl x86_pkg_temp_thermal snd_soc_sst_ipc intel_powerclamp coretemp snd_soc_sst_dsp snd_hda_codec_hdmi snd_soc_core kvm_intel snd_compress ac97_bus snd_pcm_dmaengine snd_hda_codec_realtek kvm dw_dmac_core snd_hda_codec_generic input_leds snd_hda_intel irqbypass iwlmvm uvcvideo snd_hda_codec videobuf2_vmalloc videobuf2_memops mac80211 snd_hda_core videobuf2_v4l2 videobuf2_core v4l2_common snd_hwdep joydev serio_raw snd_pcm videodev btusb media btrtl thinkpad_acpi cdc_ether btbcm option iwlwifi nvram usbnet usb_wwan usbserial btintel mii rtsx_pci_ms snd_seq_midi bluetooth memstick snd_seq_midi_event cfg80211 snd_rawmidi mei_me mei snd_seq shpchp snd_seq_device snd_timer snd soundcore mac_hid parport_pc ppdev lp
 parport autofs4 btrfs xor raid6_pq drbg ansi_cprng algif_skcipher af_alg dm_crypt rtsx_pci_sdmmc i915_bpo crct10dif_pclmul crc32_pclmul aesni_intel intel_ips i2c_algo_bit aes_x86_64 drm_kms_helper lrw gf128mul glue_helper ablk_helper syscopyarea cryptd sysfillrect sysimgblt fb_sys_fops e1000e ahci drm psmouse ptp rtsx_pci pps_core libahci wmi video fjes
CPU: 1 PID: 1080 Comm: Xorg Not tainted 4.4.0-28-generic #47-Ubuntu
Hardware name: LENOVO 20F6007RGE/20F6007RGE, BIOS R02ET48W (1.21 ) 06/01/2016
 0000000000000286 000000009c6cf672 ffff88040dfa39a8 ffffffff813eb1a3
 ffff88040dfa39f0 ffffffffc0373c98 ffff88040dfa39e0 ffffffff81081102
 ffff88040fc7c000 ffff880409629d9c ffff88040fc7b000 ffff880409020b78
Call Trace:
 [<ffffffff813eb1a3>] dump_stack+0x63/0x90
 [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
 [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffc02a569c>] skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
 [<ffffffffc02a5836>] skl_update_wm+0x186/0x5f0 [i915_bpo]
 [<ffffffffc02b1800>] ? intel_display_power_put+0xd0/0x130 [i915_bpo]
 [<ffffffffc02a955e>] intel_update_watermarks+0x1e/0x30 [i915_bpo]
 [<ffffffffc0311db5>] intel_atomic_commit+0x485/0xdc0 [i915_bpo]
 [<ffffffffc00a47de>] ? drm_atomic_check_only+0x18e/0x590 [drm]
 [<ffffffffc00a4c17>] drm_atomic_commit+0x37/0x60 [drm]
 [<ffffffffc01a4b16>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
 [<ffffffffc00a34aa>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
 [<ffffffffc0093e42>] drm_mode_set_config_internal+0x62/0x100 [drm]
 [<ffffffffc0098362>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
 [<ffffffffc0089742>] drm_ioctl+0x152/0x540 [drm]
 [<ffffffffc0097f90>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
 [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
 [<ffffffff81701610>] ? __sys_recvmsg+0x80/0x90
 [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
 [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
---[ end trace a13f8ffdea74aa69 ]---

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  ThinkPad X260 connecting external DisplayPort hangs system

Status in linux package in Ubuntu:

Bug description:
  Running Ubuntu 16.04 on a Lenovo ThinkPad X260 with Intel Skylake HD
  Graphics 520, connecting an external monitor to the DisplayPort
  connector causes the system to quickly hang. The system stops
  responding to network pings, cannot switch consoles, and needs a hard

  The external monitor does work when using a text console, and does not
  always hang in the LightDM login screen, but starting up a desktop
  session will always hang.

  This originally happened using a ThinkPad dock, and I tested it
  further using an external DP monitor. This happens on 4.4.0-28-generic
  as well as mainline 4.6.3-040603-generic and 4.7.0-040700rc5-generic;
  they all hang in a similar fashion.

  I have attached a journalctl log from running 4.4.0-28-generic and
  connecting the DP monitor while in a text console, before switching to
  the graphical console and logging in. The system hangs after a series

  kernel: WARNING: CPU: 3 PID: 2319 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:3647 skl_update_other_pipe_wm+0x15d/0x170 [i915]
  2016-06-29T12:54:52+0300 tehobari kernel: WARNING: CPU: 3 PID: 4418 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:13957 skl_max_scale.part.108+0x69/0x70 [i915]
  kernel: [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

  The first warnings come immediately when connecting, and others when
  switching consoles and logging in.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-28-generic 4.4.0-28.47
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  terom      1903 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jun 29 13:03:18 2016
  InstallationDate: Installed on 2016-06-26 (2 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: LENOVO 20F6007RGE
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-28-generic root=UUID=6636a3bb-262e-4ab2-ae81-d9388e3f7684 ro rootflags=subvol=@ quiet splash
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/01/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R02ET48W (1.21 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20F6007RGE
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40705 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrR02ET48W(1.21):bd06/01/2016:svnLENOVO:pn20F6007RGE:pvrThinkPadX260:rvnLENOVO:rn20F6007RGE:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20F6007RGE
  dmi.product.version: ThinkPad X260
  dmi.sys.vendor: LENOVO

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