Am 28.10.2011 18:01, schrieb cheshirekow:
On Sun, 2011-10-23 at 13:50 -0400, cheshirekow wrote:
On 10/22/2011 03:16 AM, Alexey Fisher wrote:
Can you please attach the output of this command:
lsusb -vd 10f1:1a26> lsusb_dump
Sure. The dump file is attached.
Thanks!
Has anyone by chance managed to take a look at this lsusb dump?
To recap:
the HP Slate has two integrated we cams: One forward facing for video
calls, and one higher-resolution rear-facing for snapping photos. There
appears to be a single controller for both cameras. In linux, lsusb only
shows one webcam device. In windows, the device manager also shows only
one device for the webcam. However, in windows applications that use the
webcam (i.e. HP's webcam application, and in skype) I'm able to select
which one to use as an option. In linux, there is only one video
device, /dev/video0.
There does not appear to be any control available from uvcdynctrl or
within vlc to select which physical camera to use. I've tried setting
the resolution in vlc when I use the "open capture device" menu item. I
know that the forward facing camera is VGA so I tried specifying
640x480, but the result is that it shows the rear-camera stream at a low
resolution, rather then showing the forward-camera stream.
I'd appreciate any suggestions on how to get the forward-facing camera
to work in linux (for skype/google video calls). Also, if it is clear
that this facility is not available in UVC and that there is no way this
is possilble, that would also be useful information.
Thanks again
Hi,
suddenly i do not see any control to switch the sensor. I assume there
can be two variants how it may work:
1. vendor specific extension unit for uvc
2. or usb mode switcher
if both sensors have same capabilities, the 1. make sense. If not then
second. Because this usb dump report settings only for one sensor.
For 1. it will be probably possible to control it with libwebcam. For 2.
it should be possible to control it with some kind of usb_modeswitch
(i'm not up to date).
To find what it is actually, there can be fallowing options:
1. sniff usb traffic
2. see if the windows driver has some advise for us
3. unscrew your laptop and find what control use your webcam.
Regards,
Alexey
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