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[JohnAspinall <1617003@xxxxxxxxxxxxxxxxxx>]

Also attached strace output from hanging subprocess in the case of
firefox.


** Attachment added: "firefox.12569"
   https://bugs.launchpad.net/ubuntustudio/+bug/1617003/+attachment/4727752/+files/firefox.12569

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https://bugs.launchpad.net/bugs/1617003

Title:
  "vblank wait timed out" triggered by Notes (panel app) install

Status in Ubuntu Studio:
  New

Bug description:
  Ubuntu Studio 16.04 on Lenovo T520 laptop.

  I installed (Panel App -> Panel -> Install New Items) the Notes panel app.
  After doing so (and continuing after I removed it) I'm now getting this sort of error in dmesg:

  [64397.223784] WARNING: CPU: 2 PID: 3000 at /build/linux-5vkMGy/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b0/0x1c0 [drm]()
  [64397.223785] vblank wait timed out on crtc 0

  The user-visible symptom is that many apps (Firefox, Thunderbird, LibreOffice) now hang upon launch.
  If I poke around in the process tree, all apps are waiting on a subprocess.  Killing the subprocess will bring up the app.

  Running strace on the processes, the hanging subprocesses have this in common:
   * opening /etc/drirc for read
   * checking for the existence of ~/.drirc (it doesn't exist)
   * a syscall writing to some handle that ends up hanging, e.g.

      ioctl(5, DRM_IOCTL_I915_GEM_CREATE, 0x7ffd90290680) = 0
      ioctl(5, _IOC(_IOC_READ|_IOC_WRITE, 0x64, 0x5e, 0x28), 0x7ffd90290630) = 0
      ioctl(5, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7ffd90290630) = 0
      ioctl(5, DRM_IOCTL_I915_GEM_SET_DOMAIN <unfinished ...>

  I've attached a larger fragment from dmesg.

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