Yeah, it works fine with your module. Did you just revert "drm-i915-fix-
hotplug-irq-ack-on-i965-g4x.patch" ?

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  Crash from :i915 module with 4.15.0-46-generic using multi-display

Status in linux package in Ubuntu:

Bug description:
  While previously working using 4.15.0-45-generic, booting my thinkpad
  T480 on a dock with additional screen connected and "kernel
  4.15.0-46-generic" lead to a crash of the system.

  Laptop is running Ubuntu 18.04.2 LTS.
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
   /dev/snd/pcmC1D0c:   user       3449 F...m pulseaudio
   /dev/snd/controlC1:  user       3449 F.... pulseaudio
   /dev/snd/pcmC0D0p:   user       3449 F...m pulseaudio
   /dev/snd/controlC0:  user       3449 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=c94c8e19-c9cc-49db-b6e7-4e1542a5efa7
  InstallationDate: Installed on 2018-06-28 (256 days ago)
  InstallationMedia: Ubuntu-Budgie 18.04 LTS "Bionic Beaver" - Release amd64 
  MachineType: LENOVO 20L5000AFR
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-45-generic 
root=/dev/mapper/ubuntu--budgie--vg-root ro quiet splash
  ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
   linux-restricted-modules-4.15.0-45-generic N/A
   linux-backports-modules-4.15.0-45-generic  N/A
   linux-firmware                             1.173.3
  Tags:  bionic
  Uname: Linux 4.15.0-45-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker libvirt lpadmin netdev plugdev sambashare 
sudo vboxusers wireshark
  _MarkForUpload: True 03/14/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N24ET37W (1.12 )
  dmi.board.asset.tag: Not Available 20L5000AFR
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrN24ET37W(1.12):bd03/14/2018:svnLENOVO:pn20L5000AFR:pvrThinkPadT480:rvnLENOVO:rn20L5000AFR:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: ThinkPad T480 20L5000AFR
  dmi.product.version: ThinkPad T480
  dmi.sys.vendor: LENOVO

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