On 25/03/14 23:03, Laurent Pinchart wrote: > 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. Apologies for the nagging: What's the current status? Thanks Will -- 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
