On Wed, 2021-11-24 at 22:12 +0100, Patrick Dupre wrote:
> v4l2-ctl --list-devices
> Cannot open device /dev/video0, exiting.
>  
> It looks like that I cannot turn the camera on (it is an internal
> camera).
> fn+f6 does not do any thing.
> The worst is that this camera has been workig in the past!

Hardware does fail.  And that can be a major pain when it's built-in.

If it weren't built in, one other guess might be that the computer
doesn't have sufficient power on its USB buses to run the camera. 
Though that's still a possibility, even with built-in cameras, they're
often an internal USB device.

The computer shares its USB power availability across a number of USB
ports, often in groups (e.g. one set of sockets shares a 1 amp maximum,
a second pair has their own 1 amp maximum), and there is a finite
maximum it can power.  You could try unplugging any extra USB
accessories to see if it makes any difference.

If I try plugging two webcams into my system USB things start to fail
in a very short time (a camera will go offline, the keyboard will fail,
a mouse will go erratic).  To recover, I'd have to unplug all USB
devices, wait a moment, then reconnect just keyboard and mouse. 
They're not identical models, so it shouldn't be a peculiar mistaking
of devices confusing it.
 
-- 
 
uname -rsvp
Linux 3.10.0-1160.45.1.el7.x86_64 #1 SMP Wed Oct 13 17:20:51 UTC 2021 x86_64
 
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