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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

-- 
Crypt Login freeze and random system freeze
https://bugs.launchpad.net/bugs/1503572
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