kernel-packages team mailing list archive

[Dennis Gesker <dennis@xxxxxxxxxx>]

response from linux-fbdev:

Hi Dennis,

Only drivers for DisplayLink's USB 2.0 generation chips (DL-1x5) are
available and in kernel.  That Dell dock is using the newer DL-3x00
chips.  There's no way to get the graphics portion working for Linux on
that.

Part of the reason is even for USB 2.0 graphics devices where the driver is in kernel, getting anything working is very distro and component-version dependent.  You'll see a few success stories if you search around, but they're fleeting. In short, it's not for any normal user. For the longer story (if you have a USB 2.0 generation device), see http://plugable.com/2014/03/06/displaylink-usb-2-0-graphics-adapters-on-linux-2014-edition
. 
By the way, programmatically you can tell the difference between the DL-1x5 chips and the newer ones by these portions of the USB descriptors:
  idVendor           0x17e9 DisplayLink [this is the vendor ID for all DisplayLink chips, regardless of brand of product they're used in]
  Configuration Descriptor:
    Interface Descriptor:
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      3 [DL-3x0 chips with in-kernel support have bInterfaceProtocol=3. Later protocols are not supported]

This is how they're distinguished in uldfb (the fbdev driver I helped
with) and udl (the DRM driver David Airlie created).

Sorry for the bad news,
Bernie

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1376771

Title:
  DisplayLink Attached Display Adapter and Monitor Not Recognized

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  DisplayLink Plug and Play Universal docking Station
  DELL
  Model: D3000
  MFG: ACP075US
  SN: 1309017059

  All ports on the device are recocognized and function correctly except
  the display adapter.

  Description:	Ubuntu Utopic Unicorn (development branch)
  Release:	14.10

  This problem also exists under trusty. 14.04

  My intention is to drive 2 external monitors with this device.
  This specific device has no issues under Windows 8.1

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-20-generic 3.16.0-20.27
  ProcVersionSignature: Ubuntu 3.16.0-20.27-generic 3.16.3
  Uname: Linux 3.16.0-20-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gesker     2140 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Oct  2 08:54:53 2014
  HibernationDevice: RESUME=UUID=8d719d41-d691-447b-8dd0-29bbdd631465
  InstallationDate: Installed on 2014-08-24 (38 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: System76, Inc. Gazelle Professional
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-20-generic root=UUID=5dc9a0a5-84ba-495e-b644-8d11f37bece5 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-20-generic N/A
   linux-backports-modules-3.16.0-20-generic  N/A
   linux-firmware                             1.134
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-09-26 (5 days ago)
  dmi.bios.date: 05/16/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Gazelle Professional
  dmi.board.vendor: System76, Inc.
  dmi.board.version: gazp7
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd05/16/2012:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp7:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp7:cvnNoEnclosure:ct9:cvrN/A:
  dmi.product.name: Gazelle Professional
  dmi.product.version: gazp7
  dmi.sys.vendor: System76, Inc.

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