On Tue, Dec 27, 2022 at 09:25:00PM +0100, Bodie wrote: > This one may help a little too > > https://community.silabs.com/s/article/the-role-of-stall-handshake-packet-in-usb-transfer?language=en_US
I would like to express again my grateful thanks for the help provided. I had the opportunity to test another webcam and Iridium could use it without any problems. So this issue could presumably be hardware-related in the end. What can be said is the webcam that Iridium couldn't access to is able to go to a resolution up to 3840x2880 which I never could use with video(1) without getting an mmap error message. However, it can be accessed in raw mode with e.g. fswebcam, so I can use my device as an overhead scanner for books, which is fine. For information, my limits are as follows: $ ulimit -a time(cpu-seconds) unlimited file(blocks) unlimited coredump(blocks) 0 data(kbytes) 1572864 stack(kbytes) 4096 lockedmem(kbytes) 87381 memory(kbytes) 16182924 nofiles(descriptors) 512 processes 256 Could it be that Iridium unsuccessfully tried to probe the device via mmap up to this resolution? Anyway, the good news is that using another device now gives excellent results. Thank you! -- Robert
