1. This camera is being set on a Gimbals which moves a lot, while it's connected via USB to the Odroid.
maybe after a while it caused a physical damage to the connection, and made it shorten.
This seems more plausible than CHDK being the cause.
Not saying it would be
impossible for CHDK to be involved, but it's difficult for me to see a plausible mechanism, and many people have used remote shoot a lot.
Another thing you should consider is the electrical configuration in your setup. If the USB power from the Odroid was out of spec, or there was some electrical problem (shorts involving the USB stuff outside the camera maybe?)
2. I was running chdkptp with -c followed by a 'remoteshoot -cont=6000', then after a while I run a new chdkptp command with -c followed by a 'killscript' command.
Reyalp, you told me it's shouldn't work since only one connection can be established at a time but it did work...
Please read my last response again
http://chdk.setepontos.com/index.php?topic=11193.msg112539#msg112539 I didn't say it wouldn't work, I said it wasn't safe. However, I meant this in terms of the camera crashing or data loss, I have no reason to believe it would cause permanent damage.
In your opinion, can anyone of this scenarios be the cause of the Descriptor mismatch?
It seems unlikely to me, it seems like it should only cause purely software problems, which would be cleared on reboot.
Of course, we really don't know for sure. One could imagine scenarios where the camera kept some kind of internal error count and decided the USB port was bad after too many errors, but I don't really see why Canon would do something like that. It's also possible that a USB connection reset involves updating something non-volatile that can get corrupted, but again, that seems like a stretch.
One other thing to check would be if the "USB Remote" functionality still works.
You can test this by going to remote parameters under the chdk settings menu and setting
Enable remote 1
Switch type onepush
Control mode normal
then switch the camera to REC mode and plug in a usb cable
If it's working, the camera should focus when you plug in, and shoot when you unplug.
If it doesn't work, then I think that would be a very strong indication the USB hardware in the camera is damaged. However, if it DOES work, I wouldn't consider that a sign the hardware is OK.
Another long shot, but I assume you've tried taking the battery out for a while? If the RTC battery is replaceable, you could try removing that too.
Regarding alternate cameras, I know that user SticK used the S90 very extensively with USB (though with regular shoot and download, not continuous remoteshoot) Perhaps you could find this used or refurbished. I don't know if it meets your requirements.
