Re: Chicony Electronics 04f2:b1b4 webcam device unsupported (yet)

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Hi Michael,

On Saturday 17 July 2010 17:18:27 Michael Kromer wrote:
> Am 17.07.2010 17:00, schrieb Laurent Pinchart:
> > On Saturday 17 July 2010 15:25:08 Michael Kromer wrote:
> >> Am 17.07.2010 10:57, schrieb Laurent Pinchart:
> >>> On Saturday 17 July 2010 10:34:20 Michael Kromer wrote:
> >>>> On 07/16/2010 07:14 PM, Pete Eberlein wrote:
> >>>>> On Fri, 2010-07-16 at 18:32 +0200, Michael Kromer wrote:
> >>>>>> I have bought myself a rather new Lenovo Thinkpad X100e, and there
> >>>>>> is no support for the webcam device in the current (2.6.34) kernel
> >>>>>> (yet). 2.6.35 doesn't seem to have a driver for it either. Is there
> >>>>>> any possibility for one of you guys to take a look at it?
> >>>>> 
> >>>>> The descriptors look like a standard USB Video Class device.  Do you
> >>>>> have the uvcvideo module loaded?  Then have a look at your dmesg
> >>>>> output to see why it isn't working.
> >>>> 
> >>>> my problem is:
> >>>> 
> >>>> [ 2578.903972] uvcvideo: Found UVC 1.00 device Integrated Camera
> >>>> (04f2:b1b4) [ 2578.905121] input: Integrated Camera as
> >>>> /devices/pci0000:00/0000:00:13.2/usb2/2-2/2-2:1.0/input/input10
> >>>> [ 2578.905224] usbcore: registered new interface driver uvcvideo
> >>>> [ 2578.905228] USB Video Class driver (v0.1.0)
> >>>> 
> >>>> It is indeed registred as video device, however, everytime i use some
> >>>> program (i tried cheese) to use /dev/video0 I get the following:
> >>>> 
> >>>> [ 2741.757993] uvcvideo: Failed to query (130) UVC control 5 (unit 3)
> >>>> : -32 (exp. 1).
> >>> 
> >>> Could you please send me the output of
> >>> 
> >>> lsusb -v -d 04f2:b1b4
> >> 
> >> Bus 002 Device 003: ID 04f2:b1b4 Chicony Electronics Co., Ltd
> > 
> > [snip]
> > 
> > Thanks. You're the second one in a few weeks to report a bug that has
> > been there for years. Could you please try the following patch ? It
> > should end up in the mainline kernel in 2.6.36 (2.6.35 might be
> > possible, depending on when Mauro comes back from holidays).
> > 
> > http://git.linuxtv.org/v4l-
> > dvb.git?a=commitdiff;h=9c3b10b53875279306d8464fe9b24fa634329fc8;hp=f06b9b
> > d4c62ef93f9467a1432acf2efa84aa3456
> 
> I've been looking at this issue as well, and have already seen the patch
> you mentioned:
> 
> https://patchwork.kernel.org/patch/110187/
> 
> However, this problem didn't change anything - same error.
> 
> If it helps, I can provide you with an SSH session if this helps, so you
> could investigate the problem directly.

Are you 100% sure that you've loaded the patched driver ? Try modifying 
DRIVER_DESC at the beginning of uvc_driver.c and check the kernel log with 
dmesg to make sure the correct driver is loaded.

-- 
Regards,

Laurent Pinchart
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