Hi Carl, On Wednesday 03 August 2011 08:29:56 Carl Michal wrote: > On Tue, 2 Aug 2011, Laurent Pinchart wrote: > > 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 :-) > > err - somehow they looked a little less identical when I went to paste > the second one in. Blame that on the new baby... > > > 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), and if the values reported by the > > driver match the two values that worked before ? > > yavta -l for either camera lists three exposure controls (with different > values for the min, max and default): > > control 0x009a0901 `Exposure, Auto' min 0 max 3 step 1 default 3 current 3. > 1: Manual Mode > 3: Aperture Priority Mode > control 0x009a0902 `Exposure (Absolute)' min 3 max 2047 step 1 default 166 > current 166. control 0x009a0903 `Exposure, Auto Priority' min 0 max 1 step > 1 default 0 current 0. > > The two values reported for the 'Exposure, Auto' control are the two > values in the drop down that worked before. But that control isn't drawn > by guvcview at all now (tried guvcview: 1.4.2, 1.4.4 or 1.4.5). > > Interesting though, luvcview (0.2.6) draws the first two of those controls > (but not the third). So - I turned off the auto exposure in luvcview and > now the manual exposure setting works. But - now I can't turn auto > exposure back on. luvcview says either: > > Auto Exposure set to 1 > or > Set Auto Exposure off error > > It looks like luvcview wants to set values of either 0 or 1, when the > legal values are 1 or 3. > > with v4l2-ctl, I can set the Auto Exposure control to 1 or 3 and it seems > to work correctly. So looks like the driver does the right thing but maybe > both guvcview and luvcview are confused by the available values?
That's quite likely. Do you want to have a try at fixing them ? :-) -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
