Hello, everyone, and thanks for any pointers (and many thanks for reading this lengthy post):
I'm on my third sample of the QHY294M (one had a sensor defect, the other an USB port malfunction). This is the first time I tried out this sample - so it has never worked correctly for me. My vendor hasn't answered to my inquiry yet (but I emailed them just yesterday and I'm sure they are kinda sick of these problems, too). QHY support is in some late-summer holiday for a few days, I hope they will respond afterwards.
This time around, the camera works fine for about 1.5-2 hours and then downloading of images stops, the camera stops responding. Sometimes the connected software (Voyager, NINA, SGP) hangs at that point, sometimes not. Many times, it starts showing strange values for sensor temperature (like -2351C). This is independent of using ASCOM or the native drivers. At that point, in the settings the camera is often seen as if connected by USB 2.0 ("This device could be faster if connected to an USB 3.0 port"). It is fixed by the following protocol:
- Disconnect the camera from both power and USB
- Reconnect power, then USB. The device now shows up with the following errors: "Unrecognized device: Port reset failure. Driver error."
- In the settings, "disconnect" the device
- Disconnect power and USB
- Reconnect power, then USB
Skipping any step leads to an "Unrecognized device".
I use the lastest beta drivers because the "stable" drivers are from 2019 and do not recognise the camera. I tried older drivers, but after connecting to the camera with newer ones, those do not recognise it anymore (probably because of a firmware update). That the above procedure is necessary keeps me hoping it's some driver/software problem instead of yet another hardware defect.
Fixes I tried:
- I used 3 different USB cables that work fine for other USB 3.0 cameras (two cooled ZWO and one uncooled QHY), including the original QHY cable. The shortest is 30cm.
- I tried this now on three different computers (with each of the cables), one of which never had any astro related SW installed before, to rule out any lingering driver issues. These were my Astro-dedicated NUC, a Dell 20" Tablet and a gaming desktop. None of them have any issues with other equipment. The NUC is probably the most trouble-free computer I ever owned (and I'm a die-hard Mac user).
- I have turned off any USB-realted energy saving in the settings and also in the device manager for any USB-hub-like or PCIE device that I could find.
- The camera is connected directly to the computer, no hubs involved.
- I switched power supplies from a Baader outdoor supply (12V 5A) to a high-quality lab supply (12V, 50A, regulated to 5A - camera says 3A max). There's no power spike when the problem begins
Fixes I am planning on
- Install INDI/EKOS on a Linux VM or my Mac to see if it's a driver problem
- Try a powered USB hub
- I ordered some new USB cables, should arrive tomorrow
If anyone has anything more to add, I would be grateful for any hints. Sorry for the long post, didn't want to skip anything important.