Anisotropic aniso level in some Android devices

Hi, I’m developing an Android game, and I’ve tested it on many devices. On some of them (not many, fortunately) the aniso level doesn’t work. I mean, it obey to the anisotropic filter (point, bilinear, trilinear), but it always run on level 0, no matter what level is set. I’ve tried it with only 1 quality setting, with forced anisotropic, so it’s not a quality setting issue.
Anyone know what could be the cause, and if there’s some fix for this?
Thank you for your time!

anybody?

now,i meet this problem anybody can sole it???