Hi, 2011/8/2 Laurent Pinchart <laurent.pinch...@ideasonboard.com>: > Hi Carl, > > On Tuesday 02 August 2011 07:29:47 Carl Michal wrote: >> Hi Laurent, >> >> I understand there were changes made in the exposure settings >> in 3.0. I just installed 3.0 and have some new/different issues here. >> >> I have two cameras available: a quanta integrated webcam in a dell XPS 15 >> and a logitech C910. >> >> For either camera, guvcview used to give me a drop-down menu with 4 >> exposure options in addition to an auto priority checkbox and a slider to >> manually set the exposure. Two of the drop-down settings didn't seem to >> work, but two of them did. With a 3.0 kernel, there is only an auto >> exposure check-box and manual exposure slider - but the exposure slider no >> longer works and guvcview says: >> control id: 0x009a0902 failed to set (error -1) (for the quanta) >> or >> control id: 0x009a0902 failed to set (error -1) (for the logitech) > > So pretty much the same error for both :-) > > Could you try listing the controls with v4l2-ctl or yavta ? The auto-exposure > control should still be a menu (I expect guvcview to convert it to a boolean > control automatically for some reason, maybe because it has two values only),
No, if a menu control is reported, then guvcview (1.4.5 at least) displays a drop down box, the only special cases are for some integer controls (pan/tilt and led mode - logitech extension control). Unless libv4l is doing some magic on this specific control, if a checkbox is being displayed by guvcview then it means is being reported as a boolean control. Regards, Paulo > and if the values reported by the driver match the two values that worked > before ? > > yavta -l /dev/video0 reports > > control 0x009a0901 `Exposure, Auto' min 0 max 3 step 1 default 3 current 3. > 1: Manual Mode > 3: Aperture Priority Mode > > on my C905. Writing to the Exposure (Absolute) control when Exposure, Auto is > set to 3 fails with EIO, and succeeds if Exposure, Auto is set to 1. > > -- > Regards, > > Laurent Pinchart > _______________________________________________ > Linux-uvc-devel mailing list > Linux-uvc-devel@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
