--- Marco Rogantini <>
wrote:
> On Thu, 13 Oct 2005, Frans Meulenbroeks wrote:
>
> > Meanwhile I also performed an additional test:
> > I replaced the 2.0 hub with a 1.1 hub.
> > Guess what: it works.
> > It even works when connecting a 2nd cam.
> >
> > I'm still interested in getting this working with
> the 2.0 hub though, so I am open for any
> suggestions.
>
> You are using the EHCI Host Controller Driver,
> aren't you? Try to use
> UHCI or even OHCI.
Unfortunately if I disable EHCI I loose usb 2.0
functionality and I am using a USB harddisk.
However, I found something for an audio device.
I quote:
ALSA has a quite good support for USB audio devices,
the
only problem could be when you mix USB 1.1 audio
devices with USB 2.0 hubs.
The CONFIG_USB_EHCI_SPLIT_ISO option in the kernel
must be enabled to cope with that.
This triggered me to try this option as well.
The good news is that I managed to take pictures.
The bad news is that I can only use resolutions that
are not compressed.
For all compressed images I get this:
Jan 1 00:05:00 (none) user.debug kernel: pwc
decode_size = 2. Jan 1 00:05:00 (none) user.debug
kernel: pwc set_video_mode(640x480 @ 10, palette 15).
Jan 1 00:05:00 (none) user.debug kernel: pwc
decode_size = 5. Jan 1 00:05:01 (none) user.debug
kernel: pwc Frame buffer underflow (230 bytes);
discarded. Jan 1 00:05:01 (none) user.debug kernel:
pwc Frame buffer underflow (1156 bytes); discarded.
(nevermind the clock, it was not set due to another
issue)
So uncompressed images work, compressed works.
I feel this is related to USB and not PWC, but I
wanted to mentionn it anyway, as some of you might
have suggestions, and at least someone else might
benefit from this knowledge.
Tips, suggestions etc are of course welcome.
I'll dig further in this tomorrow.
Frans.
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