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Firmware files for the Raspberry Pi
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v4l2 Failed to allocate urb buffer 0 with pwc driver (Philips webcam) #254

Closed FlareP1 closed 3 years ago

FlareP1 commented 3 years ago

v4l2 Failed to allocate urb buffer 0 with pwc driver (Philips webcam)

In the latest kernel it is not possible to capture from a Philips web cam using the pwc driver pwc: Philips SPC 900NC USB webcam detected.

When attempting to get any output the following error/s are created i.e. ffmpeg -i /dev/video0 -vframes 1 output.png

ioctl(VIDIOC_STREAMON): Cannot allocate memory and in DMESG pwc: Failed to allocate urb buffer 0

On further investigation it appears to be the same as this bug, with has been diagnosed and fixed within the Linux kernel (see included patch to fix the kernel.) https://bugzilla.kernel.org/show_bug.cgi?id=210777 https://bugzilla.kernel.org/show_bug.cgi?id=211195

Quote from above "I can confirm that the PWC webcam is no longer working with the 5.10 kernel series (tried both 5.10.0 and 5.10.2) but, similarly, continues to work OK with 5.9.16."

I have rolled back to Rpi Kernel 5.4.83-v7l+ and can confirm that the pwc driver works again.

Would it be possible to get the above solution / patch pulled into the latest Rpi Kernel?

Regards

leramleram commented 3 years ago

Same here, just ran into this after upgrading to newest software.

popcornmix commented 3 years ago

I'm assuming fix is here: https://lkml.org/lkml/2021/1/4/772 It has a fixes tag so should appear in 5.10 kernel tree once it is merged.

FlareP1 commented 3 years ago

Updated to the latest Rpi Kernel today 5.10.20-v7+and can confirm that the PWC webcam is now working again. Thanks for the kernel updates.