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#1 2009-07-24 20:01:00

the_inq
Member
From: Aachen, Germany
Registered: 2009-07-24
Posts: 13

Microsoft Lifecam VX-500 and...inverted desktop colours.

Today I got an MS Lifecam VX-500 webcam for my old laptop . As soon as I plugged it in, it was immediately recognized by the Arch kernel (2.6.30-ARCH ) and the appropriate driver was loaded.

dmesg: 
uvcvideo: Found UVC 1.00 device Microsoft LifeCam (045e:074a)
input: Microsoft LifeCam as /devices/pci0000:00/0000:00:03.3/usb1/1-5/1-5.4/1-5.4:1.0/input/input13

When I tried to capture the camera input (by asking VLC player to display the video from the /dev/video0 device) , it refused to cooperate since apparently I was not a member of the user group "video". As soon as I added myself to the group, the camera image displayed perfectly but all the  colours of my desktop were inverted. When I closed vlc they switched back to normal. Later on I disconnected the webcam and tried to run skype. Immediately desktop colours were inverted. Same with amarok. When I removed myself from the "video" user group everything came back to normal!

Any ideas?


Thanks for reading this

Dimitris


Where reason fails, force prevails - Duffy Duck.

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#2 2009-07-24 20:51:06

djszapi
Member
From: Cambridge, United Kingdom
Registered: 2009-06-14
Posts: 1,439
Website

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

Which WM do you use and which version ? Is there any error message is you run it from command line ?

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#3 2009-07-25 09:50:23

the_inq
Member
From: Aachen, Germany
Registered: 2009-07-24
Posts: 13

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

Szia!

My xorg version is 1.6.2

X.Org X Server 1.6.2
Release Date: 2009-7-7
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.30-ARCH i686
Current Operating System: Linux myhost 2.6.30-ARCH #1 SMP PREEMPT Mon Jul 20 11:20:32 UTC 2009 i686
Build Date: 18 July 2009  08:27:13PM

My desktop environment is KDEmod 3.5.10


When I run vlc, skype or amarok from the command line , no errors appear but the colours become inverted. Also, when I minimize the window, colours get temporarily back to normal sad.


Where reason fails, force prevails - Duffy Duck.

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#4 2009-07-25 16:49:13

djszapi
Member
From: Cambridge, United Kingdom
Registered: 2009-06-14
Posts: 1,439
Website

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

Hm. interesting, it seems an event handling problem, could you report it to the author(s) too ?

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#5 2009-07-25 18:46:21

the_inq
Member
From: Aachen, Germany
Registered: 2009-07-24
Posts: 13

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

To make things even weirder , I tried the guvcview software, which not only displays the camera image perfectly and without any lag but also the desktop colours are unaffected while it is running. Whom do you think I should contact? The authors of the uvcvideo driver? or the maintainers of KDEmod?


Where reason fails, force prevails - Duffy Duck.

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#6 2009-07-27 03:29:10

xxxspuddy
Member
Registered: 2007-05-15
Posts: 57

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

Sounds like you've been affected by the same thing found in this thread:

http://bbs.archlinux.org/viewtopic.php?id=76507


A temporary file is just a pipe with an attitude and a will to live.

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#7 2009-07-27 10:37:35

the_inq
Member
From: Aachen, Germany
Registered: 2009-07-24
Posts: 13

Re: Microsoft Lifecam VX-500 and...inverted desktop colours.

Thanks a lot xxxspuddy for pointing this out. By downgrading  libgl and ati-dri to version 7.4.4-1  my problem has been at least partially solved. I can now be a member of the "video" group without the desktop colours going haywire. Also guvcview continues to display the camera feed properly. Unfortunately VLC now crashes when trying to do the same. Skype is also unable to display the /dev/video0 feed. The only program that seems to work ok is Kopete!


Where reason fails, force prevails - Duffy Duck.

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