I have a question regarding a curious phenomenon I just got aware of.
Perhaps there´s someone out there who can help find some explanation.
My PC is Lenovo H520e and the webcam is attached via USB.
Normally when booting my system (Lubuntu 20.04.2) I can see my webcam LED flashing up a few times.
Today however that didn´t happen.
When trying to use “cheese” the programme complained of “device not being found/available”.
Using “lnav” I looked up the message logs.
And indeed I found the following:
May 4 09:42:23 rosika-10159 pulseaudio: Failed to find a working profile. May 4 09:42:23 rosika-10159 pulseaudio: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-Microsoft_Microsoft___LifeCam_HD-3000-02" card_name="alsa_card.usb-Microsoft_Microsoft___LifeCam_HD-3000-02" │ May 4 09:42:23 rosika-10159 kernel: [ 236.409045] usb 1-22.214.171.124: 3:1: usb_set_interface failed (-71) May 4 09:42:23 rosika-10159 kernel: [ 236.413303] usb 1-126.96.36.199: 3:1: usb_set_interface failed (-71) [...] repeated many times more
but lsusb listed the device as being connected:
Bus 001 Device 010: ID 045e:0779 Microsoft Corp. LifeCam HD-3000
I rebooted the system and everything was fine again.
Does anybody have any clue as to what might have happened the first time
Many thanks in advance.