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[Wojtek Zabołotny <978891@xxxxxxxxxxxxxxxxxx>]

Adding the "acpi_backlight=vendor" kernel parameter allows my system (Dell Vostro 3750)  to boot with different USB devices connected to the USB 3.0 ports.
This solution was suggested by Len Brown in https://bugzilla.kernel.org/show_bug.cgi?id=42844#c4
-- 
Regards,
Wojtek

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https://bugs.launchpad.net/bugs/978891

Title:
  ubuntu 12.04 doesn't boot when usb device plugged in (except usb
  mouse)

Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Precise:
  Confirmed
Status in “linux” source package in Quantal:
  Confirmed
Status in “linux” source package in Raring:
  Confirmed
Status in “linux” source package in Saucy:
  Confirmed

Bug description:
  On DELL Vostro 3750 with Ubuntu 12.04 beta 64bit, boot stops with black screen is in one of USB ports is plugged USB device that is not USB mouse. I have tried USB HDD and laptop cooler USB and in both cases Ubuntu does not boot. It gets till grub and after that it loads for few seconds and then stops not even showing logo screen.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 0/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu2
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  djbacon    1993 F.... pulseaudio
   /dev/snd/pcmC0D0p:   djbacon    1993 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf2b00000 irq 54'
     Mixer name	: 'Realtek ALC269VB'
     Components	: 'HDA:10ec0269,102804c6,00100100'
     Controls      : 19
     Simple ctrls  : 11
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=099b65c3-d636-4ada-9e1b-0e9984c79454
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. Dell System Vostro 3750
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=eb98f17b-648a-4a2e-85cb-462736e19441 ro quiet splash pcie_aspm=force vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-23-generic N/A
   linux-backports-modules-3.2.0-23-generic  N/A
   linux-firmware                            1.78
  SourcePackage: linux
  StagingDrivers: mei zram
  Tags:  precise staging precise staging
  Uname: Linux 3.2.0-23-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-04-06 (6 days ago)
  UserGroups: adm admin lpadmin sambashare vboxusers
  dmi.bios.date: 05/19/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0VP036
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd05/19/2011:svnDellInc.:pnDellSystemVostro3750:pvr:rvnDellInc.:rn0VP036:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System Vostro 3750
  dmi.sys.vendor: Dell Inc.

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