Well, this is not exactly a howto, however:
If you own a philips 820/830/840K webcam (pwc driver) and it does not work and tells you something like:
[4294758.333000] pwc Failed to set LED on/off time.
[4294758.336000] pwc set_video_mode(176x144 @ 10, palette 15).
[4294758.336000] pwc decode_size = 1.
[4294758.336000] pwc Using alternate setting 1.
[4294758.336000] pwc Failed to set video mode QSIF@10 fps; return code = -32
[4294758.336000] pwc set_video_mode(160x120 @ 10, palette 15).
[4294758.336000] pwc decode_size = 1.
[4294758.336000] pwc Using alternate setting 1.
[4294758.337000] pwc Failed to set video mode QSIF@10 fps; return code = -32
Then you are possibly connecting it via an USB-2 hub. This causes the webcam not to work properly. If you want it to work, directly connect it to your computer - it seems this is a known problem with USB-2 support in the linux kernel.
Best,
ember
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