On Wed, 1 Jul 2009, Andy Walls wrote:
It's unclear to me if the PowerOnAtOpen module parameter works properly when set to 0. It might actually prevent the automatic shutoff in 3 seconds if set to zero.
I hadn't spotted that option, it does seem to work and enables the device to stay active after the programme using it has exited, preserving the settings. With PowerOnAtOpen=0, using the normal unmodified driver, I can't get a picture using either flash or kdetv. However, using my bodged driver which forces use of the SVideo input, I can now get a colour picture in flash by starting and exiting kdetv first. Odd, but it does at least provide a workable solution to my problem.
Also, by inspection I think the driver has a bug you may be able to exploit. If you already have the driver open with an application, trying to open it with another application will fail, but not before reseting the poweroff timer back to three seconds. So if you have an app that attempts to open() and close() the usbvision device node every 1 second, I think you can keep it from powering down and losing it's settings. Here's a useless little program to do just that. Compile it and invoke it as 'program-name /dev/video0'
I gave the code a try, it works up to a point, I get a colour picture in flash, but the picture is frozen. I suspect your programme is grabbing the video device back from flash before I can kill it.
Thankyou for your help ! If anybody on this list decides to try and neaten up the code for the usbvision driver, I'm happy to do a bit of testing work (contant me on tmw@xxxxxxxxxxxxx, I may not stay subscribed to this email list permanantly).
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