UGA-2K-A on Ubuntu 12.04


#1

I got UGA-2K-A (rev. B) adapter to connect my sony vaio laptop to a HDMI-only projector running Ubuntu 12.04. Followed instructions in http://plugable.com/2011/12/23/usb-gr…
But on reboot, I keep getting the green screen. Some notes:

  • uname -a gives:

Linux teddy 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

which is a recent kernel version. So I didn’t manually enable the fb_defio option

  • In /usr/share/X11/xorg.conf.d, I changed fb0 to fb1 in “Device” section, since /dev/fb0 stays even when the usb cable for Plugable is not connected.

Any help will be appreciated. Wonmuk


#2

Hi wonmuk,

Thanks for posting your question, we’ll try to help. To be sure that the X server is pointing at the correct fb, let 's take a look at what the output of the following command.

dmesg | grep udlfb

Also, if you can send your X logs to support@plugable.com that will help.

They’re here: /var/log/Xorg.*.log

We’ll take a look and see if anything looks peculiar.
Thanks,
Jerome.


#3

Dear Jerome,

Thank you for the prompt reply, and sorry for getting to this late - was away from my computer.

dmesg | grep udlfb

does NOT give any output when the plugable device is not connected. I have also sent Xorg.*.log files to the email address you supplied.

When I connect the plugable, dmesg | grep udlfb gives the following output:


[474.179097] udlfb: DisplayLink Plugable UGA-2K-A - serial #658002
[474.179107] udlfb: vid_17e9&pid_0378&rev_0106 driver’s dlfb_data struct at ffff88005b985800
[474.179111] udlfb: console enable=1
[474.179113] udlfb: fb_defio enable=1
[474.179115] udlfb: shadow enable=1
[474.179996] udlfb: vendor descriptor length:22 data:22 5f 01 0020 05 00 01 03 00 04
[474.180081] udlfb: DL chip limited to 2360000 pixel modes
[474.180292] udlfb: allocated 4 65024 byte urbs
[474.420262] udlfb: Unable to get valid EDID from device/display
[474.420278] udlfb: 640x350 valid mode
[474.420284] udlfb: 640x400 valid mode
[474.420289] udlfb: 721x400 valid mode
[474.420294] udlfb: 640x480 valid mode
[474.420298] udlfb: 640x480 valid mode
[474.420303] udlfb: 640x480 valid mode
[474.420307] udlfb: 640x480 valid mode
[474.420312] udlfb: 800x600 valid mode
[474.420316] udlfb: 800x600 valid mode
[474.420322] udlfb: 800x600 valid mode
[474.420328] udlfb: 800x600 valid mode
[474.420332] udlfb: 800x600 valid mode
[474.420337] udlfb: 1024x768 valid mode
[474.420342] udlfb: 1024x768 valid mode
[474.420346] udlfb: 1024x768 valid mode
[474.420351] udlfb: 1024x768 valid mode
[474.420356] udlfb: 1024x768 valid mode
[474.420360] udlfb: 1152x864 valid mode
[474.420366] udlfb: 1280x960 valid mode
[474.420371] udlfb: 1280x960 valid mode
[474.420376] udlfb: 1280x1024 valid mode
[474.420381] udlfb: 1280x1024 valid mode
[474.420385] udlfb: 1280x1024 valid mode
[474.420390] udlfb: 1600x1200 valid mode
[474.420395] udlfb: 1600x1200 valid mode
[474.420399] udlfb: 1600x1200 valid mode
[474.420405] udlfb: 1600x1200 valid mode
[474.420410] udlfb: 1600x1200 valid mode
[474.420415] udlfb: 1792x1344 beyond chip capabilities
[474.420420] udlfb: 1792x1344 beyond chip capabilities
[474.420424] udlfb: 1856x1392 beyond chip capabilities
[474.420429] udlfb: 1856x1392 beyond chip capabilities
[474.420433] udlfb: 1920x1440 beyond chip capabilities
[474.420437] udlfb: 1920x1440 beyond chip capabilities
[474.420443] udlfb: Reallocating framebuffer. Addresses will change!
[474.421748] udlfb: 800x600 valid mode
[474.421753] udlfb: set_par mode 800x600
[474.426297] udlfb: DisplayLink USB device /dev/fb1 attached. 800x600 resolution. Using 1880K framebuffer memory
[474.427168] usbcore: registered new interface driver udlfb

Thanks,

Wonmuk


#4

Hi Jerome,

I am using Ubuntu 12.04LTS: ‘uname -a’ yields:

Linux teddy 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

I cannot find xorg.conf under /etc. I think it is not there any more in recent versions of ubuntu. Let me instead send you the
following directory via email: /usr/share/X11/xorg.conf.d

Wonmuk


#5

Thanks Wonmuk,

We’ll have a look and reply directly through email.

Jerome.


#6