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Linux Kernel for Surface Devices
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Failure to load kernel modules in 6.4.7-surface #3 #1219

Open j-gama-oliveira opened 1 year ago

j-gama-oliveira commented 1 year ago

After update to the latest linux-surface kernel (6.4.7-surface #3) in my SP6, camera stopped working (I had previously implemented the GStreamer Loopback Device, so that I would start the camera manually from the command line). I think the problem comes from failure to load kernel modules at boot time, since I get a message «[FAILED] Failed to start Load Kernel Modules», which didn't show up before update to the lastest kernel. Thanks for any help on this, and for the great job so far.

Environment

`dmesg` output [dmesg.out.txt](https://github.com/linux-surface/linux-surface/files/12327189/dmesg.out.txt)
qzed commented 1 year ago

There are a bunch of the following lines in the log:

[    2.567912] Loading of unsigned module is rejected

That looks like secureboot prevents you from loading some modules and could explain the message you see.

What happens if you try to load the loopback module manually?

j-gama-oliveira commented 1 year ago

That might be it then (secureboot preventing loading some modules), though I have had the camera working for a couple of months now and have been keeping the linux-surface kernel always updated, and had no such problem with any of the updates up to the latest.

I just tried to run

sudo modprobe v4l2loopback video_nr=42 card_label="virtualcam" exclusive_caps=1

and indeed it got rejected:

modprobe: ERROR: could not insert 'v4l2loopback': Key was rejected by service

qzed commented 1 year ago

Right, that sounds like secureboot. You can try disabling it and see if that works. In the long term, you probably want to try and set up secureboot support / auto-signing for those modules.

j-gama-oliveira commented 1 year ago

Still didn't have the opportunity to do it, but will eventually. Thanks!

Maximilian Luz @.***> escreveu no dia domingo, 27/08/2023 à(s) 19:30:

Right, that sounds like secureboot. You can try disabling it and see if that works. In the long term, you probably want to try and set up secureboot support / auto-signing for those modules.

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