So today I tried going for ground targets with the A10C. I set the mode to CCRP, Set the Auto Lase to ON and set the auto lase time to 15 seconds my altitude was about 13k feet and I dropped a GBU-10. The result was the text "TGP AUTOLASE FAIL"
I tried the same with the GBU-12 but it gives the similar resut. I noticed that when I pressed the nosewheel steering/autolase button it didn't flash the L on the TGP screen.