Hi William, On Tuesday 25 March 2014 22:56:33 William Manley wrote: > On 13/03/14 12:38, William Manley wrote: > > The uvcvideo webcam driver exposes the v4l2 control "Exposure (Absolute)" > > which allows the user to control the exposure time of the webcam, > > essentially controlling the brightness of the received image. By default > > the webcam automatically adjusts the exposure time automatically but the > > if you set the control "Exposure, Auto"="Manual Mode" the user can fix > > the exposure time. > > > > Unfortunately it seems that the Logitech C920 has a firmware bug where > > it will forget that it's in manual mode temporarily during initialisation. > > This means that the camera doesn't respect the exposure time that the user > > requested if they request it before starting to stream video. They end up > > with a video stream which is either too bright or too dark and must reset > > the controls after video starts streaming. > > > > This patch introduces the quirk UVC_QUIRK_RESTORE_CTRLS_ON_INIT which > > causes the cached controls to be re-uploaded to the camera immediately > > after initialising the camera. This quirk is applied to the C920 to work > > around this camera bug. > > > > Changes since patch v1: > > * Introduce quirk so workaround is only applied to the C920. > > > > Signed-off-by: William Manley <will@xxxxxxxxxxxxxxxxx> > > Bump? Sorry, I haven't had the time to handle your patch yet. I'll try to do so on Thursday or Friday. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
