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[Derek <avastmc@xxxxxxxxx>]

the drm-intel-nightly kernel didn't fix the issue.

I began attempting to trace the issue and search for clues as to why
this is happening.

I am attaching three kernel log files with kernel switch: drm.debug=0x05

All of these are kernel logs after a "xset dpms force off".
- "success" is with the screen resumed successfully after a few seconds of being suspended
- "fail-proper" screen resumed after ~20 seconds, and the issue occurs
- "fail-reschg" after about 15 seconds, the computer wakes itself with no user input, external monitors are switched off, and the panel (eDP) drops to 1680x1050 and cannot be set to a higher resolution until a "service lightdm restart"

I noticed the existence of errors around "set_hdr_from_dst_qlock" in
fail-proper only and came across two patches to drm_dp_mst_topology.c -
I applied these four patches and recompiled the kernel module, and the
problem still exists.

http://www.spinics.net/lists/stable/msg113900.html

After this patch it seems like suspending does one of three behaviors:
- Wakes itself after 15 seconds with no issues
- Wakes itself after 15 seconds and the externals detach, and laptop panel goes to a lower resolution
- Doesn't wake, but on user input returns with the two external screens still part of the desktop, but with no video

** Attachment added: "verboselogs.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527829/+attachment/4549545/+files/verboselogs.tar.gz

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1527829

Title:
  displayport MST external monitors don't return from sleep mode

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When displays go to sleep, upon return from sleep the two monitors
  attached to a belkin mini displayport to 2x HDMI, do not return from
  sleep. This results in part of the desktop being inaccessible, until
  the external displays are unplugged, and then plugged back in.

  Sometimes, Xorg will also back down to one monitor. The data
  accompanying this report is for an instance where the power save mode
  caused Xorg to drop to the primary monitor only.

  This is on Ubuntu 15.10 on a Dell XPS 13 (9333) with integrated intel
  HD 4400 graphics. There are two external monitors connected by HDMI to
  a belkin DP-MST adapter which connects to the mini-displayport. A
  single-HDMI-to-mini-displayport belkin adapter works as expected
  (coming out of power save).

  xserver-xorg-video-intel:
    Installed: 2:2.99.917+git20150808-0ubuntu4

  Expected behavior: Displays go to sleep, and upon returning all
  displays are still present and all wake.

  Xorg.0.log, relevant happenings:

  [   189.711] (II) intel(0): Disabled output DP1-1
  [   189.711] (II) intel(0): Disabled output DP1-2
  [   189.739] (II) intel(0): resizing framebuffer to 1920x1080
  [   189.745] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
  [   190.339] (II) intel(0): Enabled output DP1-1
  [   190.351] (II) intel(0): Enabled output DP1-2

  dmesg relevant happenings:

  [  190.031929] ------------[ cut here ]------------
  [  190.032008] WARNING: CPU: 1 PID: 1114 at /build/linux-1vdNXv/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:476 intel_pipe_will_have_type.isra.41+0x6e/0x80 [i915]()
  [  190.032015] WARN_ON(num_connectors == 0)
  [  190.032019] Modules linked in:
  [  190.032025]  drbg ansi_cprng ctr ccm rfcomm vmw_vsock_vmci_transport vsock vmw_vmci bnep snd_hda_codec_hdmi arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel dell_wmi hid_rmi sparse_keymap kvm dell_laptop crct10dif_pclmul dcdbas crc32_pclmul dell_smm_hwmon aesni_intel iwlmvm aes_x86_64 lrw mac80211 gf128mul glue_helper ablk_helper cryptd iwlwifi uvcvideo serio_raw videobuf2_vmalloc videobuf2_memops videobuf2_core cfg80211 v4l2_common videodev media snd_hda_codec_realtek hid_multitouch snd_hda_codec_generic lpc_ich shpchp joydev input_leds snd_soc_rt5640 btusb btrtl snd_soc_rl6231 btbcm btintel snd_soc_core bluetooth snd_compress snd_hda_intel mei_me mei snd_hda_codec snd_hda_core ac97_bus snd_pcm_dmaengine snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi
  [  190.032158]  snd_seq snd_seq_device snd_timer snd acpi_als kfifo_buf dw_dmac industrialio dw_dmac_core soundcore snd_soc_sst_acpi 8250_dw i2c_designware_platform dell_rbtn i2c_designware_core spi_pxa2xx_platform intel_smartconnect mac_hid ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables parport_pc ppdev lp parport autofs4 hid_generic usbhid uas usb_storage i915 i2c_algo_bit drm_kms_helper psmouse drm ahci libahci wmi video sdhci_acpi sdhci i2c_hid hid
  [  190.032287] CPU: 1 PID: 1114 Comm: Xorg Not tainted 4.2.0-21-generic #25-Ubuntu
  [  190.032293] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A04 03/19/2014
  [  190.032298]  0000000000000000 00000000187f4872 ffff880212327ad8 ffffffff817e9449
  [  190.032309]  0000000000000000 ffff880212327b30 ffff880212327b18 ffffffff8107b3d6
  [  190.032318]  0000000000000000 ffff8802119e1800 ffff8801f0382d80 0000000066666667
  [  190.032327] Call Trace:
  [  190.032342]  [<ffffffff817e9449>] dump_stack+0x45/0x57
  [  190.032354]  [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
  [  190.032364]  [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
  [  190.032420]  [<ffffffffc01bef1e>] intel_pipe_will_have_type.isra.41+0x6e/0x80 [i915]
  [  190.032474]  [<ffffffffc01ce380>] intel_modeset_compute_config.part.90+0x460/0xb80 [i915]
  [  190.032496]  [<ffffffffc0141292>] ? drm_atomic_helper_check_modeset+0x62/0x970 [drm_kms_helper]
  [  190.032600]  [<ffffffffc01ceae2>] intel_modeset_compute_config+0x42/0x50 [i915]
  [  190.032667]  [<ffffffffc01d3adf>] intel_crtc_set_config+0x28f/0x580 [i915]
  [  190.032736]  [<ffffffffc00bdbf0>] ? drm_modeset_lock_all_crtcs+0x90/0xa0 [drm]
  [  190.032783]  [<ffffffffc00ae4a6>] drm_mode_set_config_internal+0x66/0x100 [drm]
  [  190.032839]  [<ffffffffc00b2b39>] drm_mode_setcrtc+0x3e9/0x500 [drm]
  [  190.032879]  [<ffffffffc00a3495>] drm_ioctl+0x125/0x610 [drm]
  [  190.032889]  [<ffffffff8123e836>] ? fsnotify+0x316/0x4a0
  [  190.032922]  [<ffffffffc00b2750>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  [  190.032937]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  190.032946]  [<ffffffff811ff7f5>] ? __sb_end_write+0x35/0x70
  [  190.032953]  [<ffffffff811fd42a>] ? vfs_write+0x15a/0x1a0
  [  190.032962]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  190.032986]  [<ffffffff817f0232>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  190.033013] ---[ end trace 9834aabfe51525cf ]---
  [  190.033036] ------------[ cut here ]------------
  (so on)

  Other warnings:
  [  190.068878] WARNING: CPU: 0 PID: 1114 at /build/linux-1vdNXv/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:11895 __intel_set_mode+0x7f9/0xb60 [i915]()
  [  190.293532] WARNING: CPU: 0 PID: 1114 at /build/linux-1vdNXv/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12304 check_crtc_state+0x3b3/0x440 [i915]()

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-21.25-generic 4.2.6
  Uname: Linux 4.2.0-21-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Dec 19 00:03:37 2015
  DistUpgraded: 2015-12-07 00:10:24,955 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:060a]
  MachineType: Dell Inc. XPS13 9333
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-21-generic root=UUID=9f068afb-074c-4838-b5be-f3a75fef7999 ro persistent quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-12-07 (11 days ago)
  dmi.bios.date: 03/19/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0GFTRT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd03/19/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Fri Dec 18 23:41:00 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4933 
   vendor                                     CMN
  xserver.version: 2:1.17.2-1ubuntu9.1

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