Copyright (c) 2009 Marcus Glocker <mglocker@openbsd.org>
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.Dd $Mdocdate: May 10 2023 $ .Dt UDL 4 .Os .Sh NAME .Nm udl .Nd DisplayLink DL-120/DL-160 USB display devices .Sh SYNOPSIS .Cd "udl* at uhub?" .Cd "wsdisplay* at udl?" .Sh DESCRIPTION The .Nm driver supports USB display devices based on the DisplayLink DL-120/DL-160 graphic chip. .Sh HARDWARE The following devices should work:
p l -tag -width Ds -offset indent -compact t Century Corp. Japan Plus One LCD-8000U t Century Corp. Japan Plus One LCD-4300U t DisplayLink USB to DVI t ForwardVideo EasyCAP008 USB to DVI t HP USB 2.0 Docking Station (FQ834) t HP USB Graphics Adapter (NL571) t IOGEAR USB 2.0 External DVI (GUC2020) t Koenig CMP-USBVGA10 and CMP-USBVGA11 t Lenovo 45K5296 USB to DVI t Lenovo ThinkVision LT1421 t Lilliput UM-70 t Nanovision MiMo UM-710 and UM-740 t Rextron VCUD60 USB to DVI t Samsung LD220 t StarTech CONV-USB2DVI t Sunweit USB to DVI t Toshiba Video Dock t Unitek Y-2240 USB to DVI t VideoHome NBdock1920 .El .Sh 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:
p l -tag -width Ds -offset indent -compact t Pa /etc/firmware/udl_huffman .El
p If the Huffman table can't be loaded, the driver will fall back to uncompressed mode. .Sh SEE ALSO .Xr intro 4 , .Xr usb 4 , .Xr wscons 4 , .Xr wsdisplay 4 .Sh HISTORY The .Nm driver first appeared in .Ox 4.6 . .Sh AUTHORS .An Marcus Glocker Aq Mt mglocker@openbsd.org