On Mon, 25 Mar 2013 14:36:47 -0300 Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> wrote: > Em Mon, 25 Mar 2013 19:08:46 +0200 > Timo Teras <timo.teras@xxxxxx> escreveu: > > > I just bought a Terratec Grabby hardware revision 2 in hopes that it > > would work on my linux box. > > > > But alas, I got only sound working. It seems that analog video > > picture grabbing does not work. > > > > I tried kernels 3.4.34-grsec, 3.7.1 (vanilla), 3.8.2-grsec and > > 3.9.0-rc4 (vanilla). And all fail the same way - no video data > > received. > > > > The USB ID is same as on the revision 1 board: > > Bus 005 Device 002: ID 0ccd:0096 TerraTec Electronic GmbH > > > > And it is properly detected as Grabby. > > > > It seems that the videobuf2 changes for 3.9.0-rc4 resulted in better > > debug logging, and it implies that the application (ffmpeg 1.1.4) is > > behaving well: all buffers are allocated, mmapped, queued, streamon > > called. But no data is received from the dongle. I also tested > > mencoder and it fails in similar manner. > > > > Dmesg (on 3.9.0-rc4) tells after module load the following: > > > > [ 1250.076845] em2860 #0: AC97 vendor ID = 0x60f160f1 > > [ 1250.086814] em2860 #0: AC97 features = 0x60f1 > > That looks weird on my eyes: 3 AC97 reads returned 0x60f1. I suspect > that the GPIOs for this device are different than on version 1. Yes, I just noticed this now too. It seems something went wrong when loading em28xx with a bunch of debug logging enabled. On normal load it returns instead: [ 12.453631] em2860 #0: AC97 vendor ID = 0x83847650 [ 12.463650] em2860 #0: AC97 features = 0x6a90 [ 12.463658] em2860 #0: Empia 202 AC97 audio processor detected > > Any suggestions how to debug/fix this? > > The better is to run the original driver at a recent version of KVM > with USB port forward enabled, and capture the USB logs. There are > some pages at LinuxTV wiki explaining how to do it. Oh, ok. Seems Wireshark/USBPcap might be better option for me as I don't have KVMed Windows install handy. Will try to get traces from it. - Timo -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
