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DisplayLink KMS Driver Arrives, Supports Hot-Unplug

Linux Kernel

Published on 20 February 2012 03:00 PM EST
Written by Michael Larabel in Linux Kernel
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There's a new KMS/DRM driver to introduce to the world: UDL. UDL is a DRM kernel mode-setting driver for the USB-based DisplayLink graphics adapters.

It was back in 2009 that DisplayLink decided to provide Linux GPU support and be open-source friendly for their interesting USB-based graphics adapters and since then the support has only become more compelling. At first DisplayLink provided a simple Linux library, documentation, and then a frame-buffer and X.Org driver for the hardware.

In the three years since open-source DisplayLink support landed on Linux, their drivers have improved and opened up interesting possibilities like running nine USB-based displays on Linux.

With the Linux 2.6.39 kernel there were DRM infrastructure changes to support USB DRM drivers with hope that a DisplayLink driver would eventually land. Today there's an announcement by David Airlie that he has an open-source DisplayLink KMS driver to share with the world.

The "UDL" DRM driver supports DisplayLink devices and provides support for fb_defio, the KMS dumb interface, 24bpp via conversion to 16bpp, and hot unplug using new DRM core functionality. The DisplayLink devices can be hot unplugged while handling all of the necessary changes thanks to other improvements made within the Direct Rendering Manager. This new driver is licensed under the GNU GPLv2 by David Airlie.

Besides the USB DRM changes as part of David's five-patch series, there's also fbdev changes that these patches depend upon and are currently queued up in their "-next" tree. Hopefully this work will be on final approach in time for the Linux 3.4 kernel.

The patches and announcement can be found on the dri-devel mailing list.

As far as DisplayLink's current selection of products go, they have a variety of USB graphics adapters, USB projects, and USB displays available. Their technology is used in many USB display products from various vendors (HP, Targus, IOGEAR, etc).

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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