NAME
udl —
DisplayLink DL-120 / DL-160 USB display
devices
SYNOPSIS
udl* at uhub?
wsdisplay* at udl?
DESCRIPTION
The udl driver supports USB display
devices based on the DisplayLink DL-120 / DL-160 graphic chip.
HARDWARE
The following devices should work:
- Century Corp. Japan Plus One LCD-8000U
- Century Corp. Japan Plus One LCD-4300U
- DisplayLink USB to DVI
- ForwardVideo EasyCAP008 USB to DVI
- HP USB 2.0 Docking Station (FQ834)
- HP USB Graphics Adapter (NL571)
- IOGEAR USB 2.0 External DVI (GUC2020)
- Koenig CMP-USBVGA10 and CMP-USBVGA11
- Lenovo 45K5296 USB to DVI
- Lenovo ThinkVision LT1421
- Lilliput UM-70
- Nanovision MiMo UM-710 and UM-740
- Rextron VCUD60 USB to DVI
- Samsung LD220
- StarTech CONV-USB2DVI
- Sunweit USB to DVI
- Unitek Y-2240 USB to DVI
- VideoHome NBdock1920
FILES
The device can process compressed data (Huffman pixel difference method) to reduce the USB payload. To generate the compressed data, the driver needs to load a Huffman table, which is stored in the following binary file:
- /etc/firmware/udl_huffman
If the Huffman table can't be loaded, the driver will fall back to uncompressed mode.
SEE ALSO
HISTORY
The udl driver first appeared in
OpenBSD 4.6.
AUTHORS
Marcus Glocker <mglocker@openbsd.org>