I've verified that the webcam itself is functional by plugging it into a Windows PC. I've tried two different USB ports, neither of which work. OBS and Cheese both fail to detect the device, and I believe there is supposed to be video0 in /dev/, but it does not appear. It does not show up if I do lsusb either.
#Logitech C920 webcam not detected
fresh inlet
dusky axle
Can you find it in lsusb output when it is connected?
fresh inlet
Nope, lsusb gives same result with it disconnected and connected
hollow canopy
try this method: https://forums.linuxmint.com/viewtopic.php?t=363531
fresh inlet
As in, unplug all USB devices and plug in the webcam only?
hollow canopy
As in, unplug all USB devices and plug in the webcam only?
well, unplug, reboot, then just add the cam
u can set Auto-login in Settings> users
from my understanding of the article, u may add other usb stuff like mouse after it picks up the cam
fresh inlet
I can try that sure
No luck, unplugged all USB devices, rebooted, plugged in webcam, replugged in keyboard and mouse but still not detected by lsusb, Cheese, or guvcview
Tried two different usb ports too
hollow canopy
what u got a laptop or desktop?
fresh inlet
Desktop, external webcam
hollow canopy
you said the camera works on WIndows.. Does it show some green light or sign of life while plugged in while idle, on Windows?
the person in the article said they had to use a ps/2 keyboard to launch Cheese with only the cam plugged in. and that was with Mint 20.2 which had a fair bit linux kernel of v5.4
idk what's up with that tbh
is there an on switch u must hold in maybe?
fresh inlet
For windows I just plugged it in, and it auto detected it and streamed video. Didn't check if it has a light or not, but I could tell it worked, so no button or anything as far as I can tell
hollow canopy
i have an idea
with the cam plugged in, try modprobe in linux terminal
after that, launch guvcview or cheese and test and ensure the device shows in the list of available cams to pick from in them (hopefully the modprobe helps)
fresh inlet
Literally just run modprobe in terminal, or with parameters? No experience with this command
hollow canopy
yeah try just like that
it's supposed to scan something, not sure what but if it finds something unaccounted for, it should add the kernel module
fresh inlet
Running modprobe on it's own just gives me modprobe: ERROR: missing parameters. See -h., and Cheese still doesn't work
hollow canopy
idk see what modprobe --help gives if any clue
fresh inlet
Not seeing much that's directly useful as far as I can tell
hollow canopy
my system doesn't have modprobe so i cant really see
is the cam plugged to an external usb hub? if so, try direct instead
fresh inlet
Just plugged directly in, tried both my front USB port and one in the back
hollow canopy
try this site instead of those apps. (turn cheese off ) https://webcamtests.com/
apparently this cam has had issues for years https://forums.linuxmint.com/viewtopic.php?t=218309
fresh inlet
Curious, I wonder why
fresh inlet
try this site instead of those apps. (turn cheese off ) https://webcamtests.com...
Still nothing unfortunately
Oh huh, I tried plugging it into a different PC I have, running Debian. That can detect it just fine as Logitech, Inc. HD Pro Webcam C920. Seems the issue is perhaps mint based
hollow canopy
ah.
try upgrading the kernel to 6.1 then via the Mint Update Manager, "view" menu
Debian's on 6.1
@fresh inlet
fresh inlet
Apologies, was trouble shooting a bit more. I found out that if I plug the webcam into a usb hub, then plug the usb hub in, Linux can detect it no problem. Cheese worked totally fine. So thats interesting
fresh inlet
try upgrading the kernel to 6.1 then via the Mint Update Manager, "view" menu
Is there any likelihood of upgrading to 6.1 causing other issues in the future?
hollow canopy
don't think so, but it preserves the current kernel so u may roll back if warranted
fresh inlet
Alrighty, I'm not seeing 6.1, I do see 6.2 versions however
hollow canopy
if cam works now, leave it
fresh inlet
Well it works, but only with the USB hub. Still fails to detect when plugged in directly
I suppose it's fine for now, found a different hub I'm not using frequently, but still very odd bug
hollow canopy
👍
dusky axle
Well it works, but only with the USB hub. Still fails to detect when plugged in ...
I'll have to remember that one. Very weird, since troubleshooting USB devices usually involves plugging them directly into a PC port and not into a hub. Thanks for sharing that.
fresh inlet
It is very bizarre, hopefully can be a help to others in the future. Still curious as to why Debian did not need the hub, wonder if it could be because of the kernel version
dusky axle
Actually, Debian is currently on a newer kernel than Mint. The Ubuntu LTS base is from early 2022, and Debian had a major update since then. This will turn around again to the usual state (Debian being older) this summer, when Ubuntu 24.04 LTS comes out and Mint 22 is released based on that.
fresh inlet
Ahh interesting, maybe it's been fixed by 6.1 then, and hopefully Mint will get that fix soon enough. Kernel stuff does my head in lol
meager sandal
I have a C920, and I tried it with my Mint laptop - though I'm running kernel 6.7.0 - it works fine, without a hub or anything, with OBS.
meager sandal
hmmm - I just tested it again, with a barebones mint 21.3 (cinnamon), kernel verson 5.15 install, that I have on a USB stick, and it didn't seem to have a problem with that - I installed OBS, and it picked up the webcam no problem, with lsusb and everything
fresh inlet
Strange! I'll see if if works for me when livebooting, pretty sure I have a stick with mint on it somewhere
Well now it seems to work without the hub just on my current install! Just unplugged the hub and plugged it in and now it's recognized? Curious
dusky axle
Not all USB controllers are created equal. It is probably a quirk with your specific chipset, or the driver thereof.