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[Giuseppe Di Bella <dibek71@xxxxxxxxx>]

I can confirm that it is happening now and again.
But especially when the screen is locked after a certain amount of time.
After I put the password one of the screens (I use two) doesn't work.
This is my uname -a  : 
ThinkPad-T450 3.19.0-30-generic #34~14.04.1-Ubuntu SMP Fri Oct 2 22:09:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

I normally open a console with Ctrl Alt F1 and then I go back the
desktop with Alt F7 and it solve temporarily the problem (At least till
the next locked screen)

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https://bugs.launchpad.net/bugs/1503572

Title:
  Crypt Login freeze and random system freeze

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After last two kernel updates in Ubuntu 15.04 (so 30 and 28) I am experiencing the random screen freeze as well as there is no way to write my Crypt password the first time I boot (through graphical interface). My workaround is that when Crypt login screen appears I hold power button to reboot the machine (Lenovo T450s) which then gives me terminal login through Crypt. Additional regression appears as whole system freeze at random moments (can be in browser or in OpenOffice). What is even more worrying is that I have dmesg full of errors ([drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  ) - something that was not there before.

  Also it does not matter if I have external monitor connected over HDMI
  or not, it does not matter if I have USB devices connected or not, the
  Crypt login freeze is repeatable 100%, but I do not know how to get
  logs from that boot or what to look.

  [    9.155615] ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
  [    9.155987] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input15
  [    9.158359] device-mapper: multipath: version 1.7.0 loaded
  [    9.158591] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  [    9.158772] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  ...
  [    9.280656] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
  [    9.297274] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  [    9.297445] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915_bpo])
  [    9.297453] [drm] Initialized i915_bpo 1.6.0 20150522 for 0000:00:02.0 on minor 0
  [    9.298242] fbcon: inteldrmfb (fb0) is primary device
  [   10.275607] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  ..
  [   10.337233] Console: switching to colour frame buffer device 240x67
  [   10.343218] i915_bpo 0000:00:02.0: fb0: inteldrmfb frame buffer device
  [   10.343218] i915_bpo 0000:00:02.0: registered panic notifier
  [   10.356167] Adding 8077308k swap on /dev/mapper/ubuntu--vg-swap_1.  Priority:-1 extents:1 across:8077308k SSFS
  ...
  [   32.521174] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  [   32.521473] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
  [   32.536040] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!

  lshw for display:
  *-display
               description: VGA compatible controller
               product: Broadwell-U Integrated Graphics
               vendor: Intel Corporation
               physical id: 2
               bus info: pci@0000:00:02.0
               version: 09
               width: 64 bits
               clock: 33MHz
               capabilities: msi pm vga_controller bus_master cap_list rom
               configuration: driver=i915_bpo latency=0
               resources: irq:49 memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:3000(size=64)

  3.19.0-30-generic #34-Ubuntu

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