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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1536567

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1536567

Title:
  i915 stop working after linux 4.2.0-21-generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  After updating the linux kernel of my Ubuntu 15.10 from 4.2.0-21 to 4.2.0.22
  I was unable to get to XFCE and slim login manager, I was stuck on a black screen
  with nothing displayed (no text/graphics). Same issue with latest  4.2.0.25.
  When I go back to  4.2.0-21 everything is working perfectly.

  So something is "broken" with i915 module starting 4.2.0.22 and newer.

  After some research online, I managed to make it work even with kernel 4.2.25 
  by doing this vodoo magic magic. It's not clear what made it work ;-P

  # /etc/default/grub
  GRUB_CMDLINE_LINUX="libata.force=noncq quirks.mbp_force_ahci=1 acpi_backlight=vendor apple_bl.use_gmux=1 reboot=pci i915.enable_ips=0 i915.i915_enable_fbc=1 i915.i915_enable_rc6=1 i915.lvds_channel_mode=2 i915.modeset=1 i915.lvds_use_ssc=0 intel_pstate=disable"

  # /etc/modprobe.d/i915.conf
  options i915 semaphores=1

  # /etc/modprobe.d/blacklist
  blacklist intel_pstate

  reboot

  
  lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 15.10
  Release:	15.10
  Codename:	wily

  uname -a
  Linux **** 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  dmidecode -s system-product-name
  Macmini7,1

  lspci -vv
  00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
          Subsystem: Apple Inc. Device 0141
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 56
          Region 0: Memory at a0000000 (64-bit, non-prefetchable) [size=4M]
          Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M]
          Region 4: I/O ports at 2000 [size=64]
          Expansion ROM at <unassigned> [disabled]
          Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                  Address: fee00018  Data: 0000
          Capabilities: [d0] Power Management version 2
                  Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
          Capabilities: [a4] PCI Advanced Features
                  AFCap: TP+ FLR+
                  AFCtrl: FLR-
                  AFStatus: TP-
          Kernel driver in use: i915

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