That is a known issue, seems solved in the latest kernel but AFAIK doesn't work for blackstone, so we'll have to wait.
HTC Touch HD (AKA Blackstone) running CWM 1.8 + XDAndroid FRX07 + kernel 220.127.116.11-01342 from autobuild, radio 1.17.25.09 (NOT IN USE)
HTC Touch HD2 (AKA Leo) running NANDroid with cLK, CWM & HyperDroid CM7 v6.0.0 (NOT IN USE)
Samsung Galaxy SIII Chainfire's CWM, rooted
Hit THANKS if I helped