Hi Gert, On Sat, Feb 29, 2020 at 01:07:34PM +0100, Hans Verkuil wrote: > (changed the mailinglist to linux-media since this topic is not related to libv4l2 > and CCed Laurent who might know more about this) > > On 2/29/20 10:06 AM, gert.cauwenberg@xxxxxxxxxx wrote: > > Hello, > > > > About a year ago a page about a new Easycap variant was added to the wiki - > > https://linuxtv.org/wiki/index.php/Talk:Easycap > > Has anybody been working on this? I just bought a video grabber - and it seems to be one of those... > > > > Sold as BASETech BR116, but lsusb lists it as ID 534d:0021 MACROSILICON AV TO USB2.0 > > No, to my knowledge nobody is working on this. > > It's not clear from the wiki what exactly is wrong, Laurent might have > some insight in that. The first error reported by the driver is [47452.103222] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. It is quite common for UVC devices not to support GET_DEF on the PROBE control (I assume because the Windows driver doesn't use that request), so the uvcvide driver falls back to a different method automatically. However, in some less common cases, invalid requests can actually crash the device firmware. Let's thus first check if enabling the workaround without trying the unsupported request helps. This is done by setting the UVC_QUIRK_PROBE_DEF quirk (0x100). Could you - Unload the uvcvideo driver (rmmod uvcvideo) - Reload the driver with the quirk (modprobe uvcvideo quirks=0x100) and see if it fixes your issue ? Could you also please send me the output of lsusb -d -v 534d:0021 running as root if possible ? -- Regards, Laurent Pinchart
