Re: [REGRESSION] uvcvideo: Grandstream GUV3100 (2bab:0011) broken on recent kernels (including LTS)

[Michal Pecio <michal.pecio@gmail.com>]

On Thu, 9 Oct 2025 06:16:48 +0700, Bagas Sanjaya wrote:
> On Wed, Oct 08, 2025 at 03:56:20PM +0300, Angel4005 wrote:
> > Hello,
> > 
> > I encountered regression (breakage) for the Grandstream GUV3100
> > webcam (ID 2bab:0011) in the uvcvideo driver.
> > 
> > Testing showed that the camera WORKS on kernel 6.16.8.arch3-1.
> > 
> > However, it does NOT WORK on newer kernel versions, including the
> > latest stable version (6.17.1.arch1-1) and the latest LTS kernel
> > version (6.12.51-1).
> > 
> > Problem: The driver finds the device but cannot start the video
> > stream, resulting in an error in dmesg: “No streaming interface
> > found for terminal 65535.”

Hi Angel4005,

As you are on Arch, can you try v6.12.48 LTS from the package archive?
It was released on the same day as v6.16.8 so it's hopefully good too.

If you can find the exact v6.12 series release which introduced the
breakage things may get easier, because there are much fewer commits
to worry about between releases in those LTS series.

These are the only drivers/media changes between v6.12.48 and v6.12.51:

000b2a6bed7f media: uvcvideo: Mark invalid entities with id UVC_INVALID_ENTITY_ID
fd5d3e6b149e media: rc: fix races with imon_disconnect()
effb1c19583b media: tuner: xc5000: Fix use-after-free in xc5000_release
514a519baa9e media: b2c2: Fix use-after-free causing by irq_check_work in flexcop_pci_remove

Perhaps the first one? Consider this dmesg line:

[  363.700829] usb 1-1.3: No streaming interface found for terminal 65535.

There is also a few drivers/usb changes, but I doubt they are relevant.

Regards,
Michal