[Libdlo] [PATCH] Fix displaylink-mod with 2.6.32

[Jonathan McDowell]

I noticed a shiny toy on my office mate's desk today, so I borrowed it.
It's an HP "USB DOCK" featuring a DisplayLink DVI device. The box claims
it does 1600x1200 and I have a spare 1680x1050 monitor, so I figured I'd
try it out.

I'm running Debian Squeeze, so a 2.6.32 kernel and Xorg 7.5

First I tried the udlfb driver from http://git.plugable.com/webdav/udlfb
That detected the device/monitor fine, showed the expected monitor
modes, but then picked 1280x1024 and provided a fetching green screen.
Compiling up xf86-video-displaylink 0.3 gave working X, but again only
1280x1024.

I found displaylink-mod from
http://git.plugable.com/webdav/displaylink-mod/ which seemed to suggest
it could do up to 1920x1200, but wouldn't compile. The attached patch
makes it compile for me, it detects 1680x1050 on the monitor fine and I
now have a triple head configuration running (nouveau providing the
other 2 heads).

I'm posting this in case it helps anybody else; I found several queries
about getting displaylink-mod to compile while looking for a solution,
but no answers.

(I don't know if the driver in most recent upstream kernels would have
worked fine; that would have been my next try if displaylink-mod hadn't
worked. It looks like udlfb is the more maintained driver? Are there
patches to make it work in higher resolutions I can try?)

J.

-- 
"The HSE have just asked for a list of all radiation sources in the
building.  We're trying to get my boss to describe the staff as 12
autonomous, mobile infra-red emitters" -- mhy, #debian-uk
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