What Canon shooting mode do you have it in? Is it the same one you used on the a720?If the cameras chosen AV was at one of the limits, that could also cause bracketing to fail, though assuming you are using +/- mode, at least one shot should be different.It's possible there's something broken in this port. It might be clearer to test whether Av overriding is working at all. I'd suggest something like:Put the camera in P modeMake sure canon auto-iso is offSet a shutter speed override to something that will give you a recognizable image.Set Av override to different values and compare the shots.The overrides menu is described in http://chdk.wikia.com/wiki/CHDK_User_Manual#Extra_Photo_Operations
Generally speaking, I believe that most people use TV bracketing for HDR to get a bigger exposure range with the same focus and depth of field. And as most PowerShots do not have a variable aperture anyway that works out pretty well for them.Having said that, I tested the current CHDK release on my G10 - following the steps you outlined - and the Av varies shot to shot as expected.Did you set your shooting up using [+/-] bracketing type? If not, you might have hit the limit of AV range for your camera (it does have a variable aperture but the ranges is very small - (f3.1 - f5.9 according to the literature - so you are not going to see a big exposure variation anyway).
Some cameras need an additional workaround for Av overrides to function correctly. I've attached a build with this enabled.Regarding setting tv in my instructions, set "shutterspeed enum type" to Ev Stepset "value factor" to 1set override shutter speed to something reasonable, like what the camera shows if you half press in P mode without any overrides engaged.
Is this build the same as the stable build otherwise and i can just use this as my stable build?
I will still experiment with Tv bracketing
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General Help and Assistance on using CHDK stable releases
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General Discussion and Assistance