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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: performing-bisect regression-update wily

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

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
       Status: New

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

** Changed in: linux (Ubuntu Wily)
   Importance: Undecided => High

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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:
  Triaged
Status in linux source package in Wily:
  Triaged

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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