Interestingly, when I boot into WinXP then restart (not shut down) back
to Ubuntu, I get webcam function back.

** Description changed:

  I have a Vaio SZ650 with VGP-VCC7 webcam, supported by the R5u870 driver
  (http://wiki.mediati.org/Installation).  Everything worked fine during
  Hardy Alpha but then at Beta stage something happened and I can't use my
  webcam anymore.  Now Hardy has been released, with broken webcam
  support.
  
  I think installing the latest kernel borked it, now I can't get webcam
  with any program, (cheese, xawtv, Skype, camorama) -. I have rebuilt (
  'make') and reinstalled ('make install') r5u870 just in case, but it
  makes no difference.
  
  I can view a raw video stream (there I am! On the screen!) by running
  the following, so the driver still works:
  
- ]$  gst-launch-0.10 v4l2src ! ffmpegcolorspace ! ximagesin
+ ]$  gst-launch-0.10 v4l2src ! ffmpegcolorspace ! ximagesink
  
  camorama tells me it "Could not connect to video device (/dev/video0)"
  Skype cannot detect a webcam at all
  cheese displays a test pattern
  xawtv says this:
  -------------
  This is xawtv-3.95.dfsg.1, running on Linux/x86_64 (2.6.24-16-generic)
  xinerama 0: 1280x800+0+0
  /dev/video0 [v4l2]: no overlay support
  v4l-conf had some trouble, trying to continue anyway
  Warning: Cannot convert string "-*-ledfixed-medium-r-*--39-*-*-*-c-*-*-*" to 
type FontStruct
  Warning: Missing charsets in String to FontSet conversion
  Warning: Cannot convert string 
"-*-ledfixed-medium-r-semicondensed--39-*-*-*-c-*-*-*,  -*-bitstream vera 
sans-medium-r-normal--39-*-*-*-*-*-*-*,            -*-luxi 
sans-medium-r-normal--39-*-*-*-*-*-*-*,                           
-*-*-r-normal--39-*-*-*-*-*-*-*,                                
-*-*-*-*--39-*-*-*-*-*-*-*,*" to type FontSet
  Warning: Missing charsets in String to FontSet conversion
  Warning: Unable to load any usable fontset
  Warning: Missing charsets in String to FontSet conversion
  Warning: Unable to load any usable fontset
  Error: Aborting: no fontset found
  -----------------
  
  
  uname -a
  Linux doris 2.6.24-16-generic #1 SMP Thu Apr 10 12:47:45 UTC 2008 x86_64 
GNU/Linux
  
  This is echoed into dmesg:
  
  [   36.921902] uvcvideo: Found UVC 1.00 device <unnamed> (05ca:183a)
  [   36.922148] uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -32 
(exp. 26).
  [   36.922394] uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -32 
(exp. 26).
  [   36.922396] uvcvideo: Failed to initialize the device (-5).
  [   36.922415] usbcore: registered new interface driver uvcvideo
  [   36.922417] USB Video Class driver (v0.1.0)
  .
  .
  .
  [   37.378763] usbcam: registering driver r5u870 0.11.0
  [   37.378795] r5u870-0: Detected Sony VGP-VCC7
  [   37.378797] r5u870-0: requesting microcode state
  [   37.379320] r5u870-0: camera reports negative microcode state
  [   37.379322] r5u870-0: loading microcode file "r5u870_183a.fw"
  [   37.379626] wmaster0: Selected rate control algorithm 'iwl-4965-rs'
  [   37.488173] r5u870-0: enabling microcode
  [   37.488290] r5u870-0: requesting microcode version
  [   37.488406] r5u870-0: camera reports version 0111
  [   37.488410] r5u870-0: interface 1 already claimed
  [   37.488413] r5u870-0: Found format 1: YUYV (4 frames)
  [   37.488415] r5u870-0: Found resolution 1: 640x480 ival 666666 (18432000 
B/s)
  [   37.488417] r5u870-0: Found resolution 2: 320x240 ival 666666 (4608000 B/s)
  [   37.488419] r5u870-0: Found resolution 3: 176x144 ival 666666 (1520640 B/s)
  [   37.488421] r5u870-0: Found resolution 4: 160x120 ival 666666 (1152000 B/s)
  [   37.489525] r5u870-0: Found UVC control Hue [-180,180] def:0 info:03
  [   37.491783] r5u870-0: Added 8 WDM controls
  [   37.491785] r5u870-0: control Hue/uvc 06 <= 0
  [   37.491894] r5u870-0: control White Balance Red <= 127 [capture off]
  [   37.491895] r5u870-0: control White Balance Green <= 127 [capture off]
  [   37.491897] r5u870-0: control White Balance Blue <= 127 [capture off]
  [   37.491898] r5u870-0: control Auto White Balance <= 1 [capture off]
  [   37.491899] r5u870-0: control V-Flip <= 0 [capture off]
  [   37.491901] r5u870-0: control H-Flip <= 0 [capture off]
  [   37.491902] r5u870-0: control Privacy <= 0 [capture off]
  [   37.491903] r5u870-0: control Night Mode <= 0 [capture off]
  [   37.491927] r5u870-0: registered as video0
  [   37.491947] usbcore: registered new interface driver r5u870

-- 
[Hardy] webcam stopped working after last kernel update
https://bugs.launchpad.net/bugs/219252
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