Em Mon, 25 Mar 2013 19:48:20 +0200 Timo Teras <timo.teras@xxxxxx> escreveu: > 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 Weird. Except for an additional delay, those debug stuff shouldn't be changing the driver's behavior. Are those results consistent? There are some known problems with a few em28xx devices that, from time to time, aren't able to read data from the eeprom. On such devices, it is a hardware issue. > > > > 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. Ok, thanks! Mauro -- 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
