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Old 03-23-2020, 02:58 PM   #1
dracolich
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gspca_zc3xx webcam black picture


Hi guys, I've had this Creative Webcam Live! working in wxCam for a long time in 32-bit Slackware 14.2 and my own rolled 4.19 kernels. This past fall I finally moved to 64-bit 14.2 and using only the official kernels, so my current kernel is 4.4.208. dmesg shows the camera detected as gspca_zc3xx and assigned to /dev/video0. lsmod shows the gspca modules loaded. /dev/video0 has 660 permissions and is owned by root:video, and my user belongs to the video group.

I rarely use the cam but I just installed skypeforlinux yesterday and noticed the picture is just black. I launched wxCam and same thing. Tried different frame formats and color/brightness adjustments. In the wxCam window I do see the FPS counter moving. I also launched VLC to test it there - same thing. I even tried running wxCam and skype from su in a terminal.

I've been Googling a lot last night and today and the only solution I find that works for most other users is LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so (or lib32 depending on their distro). When I try that I get the error that it is a wrong ELF class. I do have multilib installed including v4l-utils and all the gst-plugins.

What else can I try, or am I possibly missing something in the multilib setup?
 
Old 03-23-2020, 03:08 PM   #2
bassmadrigal
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Did you ever have that web camera running properly on a 4.4.x kernel? If not, it may be that full support for the camera was added in later kernels, and generally hardware support additions are not backported into older kernels.

If this is the case, you may want to consider grabbing a kernel config from -current and then compiling the latest 5.4.x kernel on your 14.2 install. I have 5.4.26 running fine on my 14.2 desktop.
 
Old 03-23-2020, 03:55 PM   #3
dracolich
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Thanks for the quick reply. I honestly don't remember 100% if it did. I think it did in 32-bit as I bounced between 4.4 and 4.19 for a while until some 4.19 bugs were fixed. I think I tried it once when I first installed Slackware64 and while reinstalling other software, so that would have been 4.4.14. wxCam and most of my other software, except for alienBob's multilib packages, are installed from SlackBuilds.
 
Old 03-24-2020, 07:04 PM   #4
dracolich
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I found another old camera, it detects and also uses the zc3xx, and it works! With the first camera I tried a couple of online camera test sites, I installed the 5.4.27 kernel using make oldconfig with the 4.4.208-huge config, and booted into Win7 (I dual boot on this machine). It was the same every time. Guess it was just dead
 
Old 03-24-2020, 07:21 PM   #5
bassmadrigal
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It sucks when hardware goes out right as you change something else. Then you think it is the change and not the hardware. Anyway, I'm glad you got it figured out.
 
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Old 03-29-2020, 04:10 PM   #6
dracolich
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Thanks, bassmadrigal. Yeah that combination makes troubleshooting trickier. So this working camera, Logitech Quickcam IM Connect, works in everything except Skype. The light doesn't even come on and I tried 8.58, 8.48, and 8.11. It does work with 8.58 in Win7.
 
  


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