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[Kenneth Bogert <1442311@xxxxxxxxxxxxxxxxxx>]

I finally found some time to work on this, and I think I have it fixed.

Debugging gnome-shell when I hit this bug (note, I could also trigger
this bug by allowing the screen to lock, no suspend necessary) I noticed
the following backtrace kept happening:

Thread 1 (Thread 0x7f920ec68a40 (LWP 12089)):
#0  0x00007f920b9f912d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f9202b8ab72 in poll (__timeout=-1, __nfds=1, __fds=0x7fff76528300) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x7f9ed0, cond=cond@entry=0x7fff76528420, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:447
#3  0x00007f9202b8c3ff in wait_for_reply (c=c@entry=0x7f9ed0, request=29601, e=e@entry=0x0) at ../../src/xcb_in.c:490
#4  0x00007f9202b8c512 in xcb_wait_for_reply (c=0x7f9ed0, request=29601, e=0x0) at ../../src/xcb_in.c:520
#5  0x00007f91f8e4b4ce in dri2WaitForMSC (pdraw=0xca4900, target_msc=0, divisor=2, remainder=0, ust=0x7fff76528550, msc=0x7fff76528558, sbc=0x7fff76528560) at ../../../../src/glx/dri2_glx.c:480
#6  0x00007f92090478f6 in _cogl_winsys_wait_for_vblank (onscreen=onscreen@entry=0xca12e0) at ./winsys/cogl-winsys-glx.c:1606
#7  0x00007f9209048016 in _cogl_winsys_onscreen_swap_region (onscreen=0xca12e0, user_rectangles=<optimized out>, n_rectangles=<optimized out>) at ./winsys/cogl-winsys-glx.c:1808
#8  0x00007f920903d341 in cogl_onscreen_swap_region (onscreen=0xca12e0, rectangles=rectangles@entry=0x7fff76528700, n_rectangles=n_rectangles@entry=1) at ./cogl-onscreen.c:337
#9  0x00007f920ce13662 in clutter_stage_cogl_redraw (stage_window=0x855b80) at ./cogl/clutter-stage-cogl.c:641
#10 0x00007f920ce77887 in clutter_stage_do_redraw (stage=0xd11bf0) at ./clutter-stage.c:1184
#11 _clutter_stage_do_update (stage=0xd11bf0) at ./clutter-stage.c:1242
#12 0x00007f920ce5e028 in master_clock_update_stages (master_clock=0xbe7880, stages=0x35dca30) at ./clutter-master-clock.c:457
#13 clutter_clock_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at ./clutter-master-clock.c:589
#14 0x00007f920c13ee04 in g_main_dispatch (context=0x7d35f0) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3064
#15 g_main_context_dispatch (context=context@entry=0x7d35f0) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3663
#16 0x00007f920c13f048 in g_main_context_iterate (context=0x7d35f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3734
#17 0x00007f920c13f30a in g_main_loop_run (loop=0x7d3390) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3928
#18 0x00007f920d883021 in meta_run () at core/main.c:556
#19 0x0000000000401d11 in main (argc=1, argv=0x7fff76528b08) at main.c:439


Specifically frame #6, it appeared to be endlessly waiting for a vblank.  So I added the following to /etc/environment:

export CLUTTER_VBLANK=none

I have just done suspend and resume 20 times without issue, whereas
previously I could trigger this bug after 3 or 4 on average.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1442311

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Possibly related to bug 1283938 . I have disabled lock screen on
  suspend to try and get around the bug but it obviously hasn't worked.

  I see a completely black screen with a working mouse cursor.  Used
  Ctrl-Alt-F2 to login at a text terminal and tried to kill gnome-
  settings-daemon and gnome-shell (doing so has randomly made it work in
  the past).  The gnome-shell process would not kill and I got segfault
  dmesg errors which are attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gnome-shell 3.10.4-0ubuntu5.2
  ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
  Uname: Linux 3.16.0-33-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.8
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Apr  9 14:31:20 2015
  DisplayManager: gdm
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-05-24 (319 days ago)
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64+mac (20140204)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to trusty on 2014-09-21 (200 days ago)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  kbogert    2487 F.... pulseaudio
   /dev/snd/controlC1:  kbogert    2487 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=41830e03-5386-43ed-88b8-1c77dd33df98
  InstallationDate: Installed on 2014-05-24 (320 days ago)
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64+mac (20140204)
  MachineType: Dell Inc. Studio XPS 1640
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-33-generic root=UUID=7ba9d8c6-141e-415a-aae4-fb57486d6148 ro quiet splash radeon.audio=1 noautogroup vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-33-generic N/A
   linux-backports-modules-3.16.0-33-generic  N/A
   linux-firmware                             1.127.11
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.16.0-33-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-09-21 (201 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo video
  _MarkForUpload: True
  dmi.bios.date: 04/09/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0U785D
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A15
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A15
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd04/09/2011:svnDellInc.:pnStudioXPS1640:pvrA153:rvnDellInc.:rn0U785D:rvrA15:cvnDellInc.:ct8:cvrA15:
  dmi.product.name: Studio XPS 1640
  dmi.product.version: A153
  dmi.sys.vendor: Dell Inc.

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