Shallow Thoughts : tags : imaging

Getting a Wacom Tablet Working under Edgy

Another person popped into #gimp today trying to get a Wacom tablet working (this happens every few weeks). But this time it was someone using Ubuntu's new release, "Edgy Eft", and I just happened to have a shiny new Edgy install on my laptop (as well as a Wacom Graphire 2 gathering dust in the closet because I can never get it working under Linux), so I dug out the Graphire and did some experimenting.

And got it working! It sees pressure changes and everything. It actually wasn't that hard, but it did require some changes. Here's what I had to do:

1. Install wacom-tools and xinput
2. Edit /etc/X11/xorg.conf and comment out those ForceDevice lines that say "Tablet PC ONLY".
3. Reconcile the difference between udev creating /dev/input/wacom and xorg.conf using /dev/wacom: you can either change xorg.conf, change /etc/udev/rules.d/65-wacom.rules, or symlink /dev/input/wacom to /dev/wacom (that's what I did for testing, but it won't survive a reboot, so I'll have to pick a device name and make udev and X consistent).

A useful tool for testing is /usr/X11R6/bin/xinput list (part of the xinput package). That's a lot faster than going through GIMP's input device preference panel every time.

I added some comments to Ubuntu's bug 73160, where people had already described some of the errors but nobody had posted the steps to work around the problems.

While I was fiddling with GIMP on the laptop, I decided to install the packages I needed to build the latest CVS GIMP there. It needed a few small tweaks from the list I used on Dapper. I've updated the package list on my GIMP Building page accordingly.

Tags: linux, X11, imaging, gimp, ubuntu
[ 15:12 Dec 09, 2006    More linux | permalink to this entry ]

Wacom Rides Again

Updating the blog again after taking time off for various reasons, including lack of time, homework, paying work, broken computer motherboard and other hardware problems, illness, a hand injury, and so on.

This afternoon, thanks to a very helpful Keir Mierle showing up on #gimp, I finally got all the pieces sorted and I now have a working tablet again. Hurrah!

I've put details of the setup that finally worked on my Linux and Wacom page.

Tags: linux, imaging, gimp
[ 18:08 May 08, 2005    More linux | permalink to this entry ]

Scanner working under 2.6

My Epson 2400 Photo scanner is finally working again. It used to work beautifully under 2.4, but since the scanner.o module disappeared in 2.6 and sane started needing libusb, I haven't been able to get it to work. (sane-find-scanner would see the scanner, but scanimage -L would not, even as root so it wasn't a permissions problem.)

Working with someone on #sane tonight (who was also having problems with libusb and 2.6) I finally discovered the trick: I had an old version of /etc/sane.d/epson.conf which used a line:

usb /dev/usb/scanner0

but I was completely missing a new, important, section which includes a line that says simply

usb

preceeded by a couple of all important comment lines:

# For any system with libusb support
# (which is pretty much any
# recent Linux distribution) the
# following line is sufficient.

So I replaced the old libusbscanner script with the new one, commented out scsi, left /dev/usb/scanner0 commented out, and uncommented the standalone usb line. And voila, it worked!

<geeky_hotplug_details>
The old /etc/hotplug/usb/epson.scanner script (which I'd gotten from a SANE help page long ago) was no longer being called, since it's been replaced by libusbscanner. The main function of either of these scripts is to do a chown/chmod on the scanner device, so that non-root users can use it. An interesting variation on this is a bugzilla attachment which changes scanner ownership to the person who is currently logged in on the console. Might be worth doing on a multiuser system (not an issue for my own desktop).

I have a line for my scanner in /etc/hotplug/usb.usermap (and indeed that's the only line in that file):

libusbscanner 0x0003 0x04b8 0x011b 0x0000 0x0000 0x00 0x00 0x00 0x00 0x00 0x00 0x00000000

which is probably redundant with the 0x04b8 0x011b line in libsane.usermap (/etc/hotplug/usb.agent, which gets called whenever a USB hotplug event occurs, looks at usb.usermap and also usb/*.usermap)
</geeky_hotplug_details>

Tags: linux, imaging
[ 18:03 Nov 22, 2004    More linux | permalink to this entry ]