Screen randomly freezes, crypt login impossible
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_
) - 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/
[ 9.158359] device-mapper: multipath: version 1.7.0 loaded
[ 9.158591] [drm:gen8_
[ 9.158772] [drm:gen8_
...
[ 9.280656] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[ 9.297274] [drm:gen8_
[ 9.297445] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_
[ 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_
..
[ 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/
...
[ 32.521174] [drm:gen8_
[ 32.521473] [drm:gen8_
[ 32.536040] [drm:gen8_
lshw for display:
*-display
bus info: pci@0000:00:02.0
width: 64 bits
clock: 33MHz
3.19.0-30-generic #34-Ubuntu
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