cx88_dvb cannot lock channels

Starting with the 2.6.35 kernels, my KWorld ATSC120 tuner will not
lock on to any channels. Everything works fine up to 2.6.34.7, but will not work with the newer kernels. This card uses CX88-dvb, s5h1409, and xc2028/3028 modules, and all modules load without any errors. Firmware loads properly. Only irregularity is that in my /var/log/messages files, I get:

Oct 19 22:46:03 slackware kernel: cx88[0]: Calling XC2028/3028 callback
Oct 19 22:46:31 slackware last message repeated 25 times
Oct 19 22:46:33 slackware kernel: cx88[0]: Calling XC2028/3028 callback
Oct 19 22:47:04 slackware last message repeated 28 times
Oct 19 22:48:05 slackware last message repeated 55 times
Oct 19 22:49:03 slackware last message repeated 39 times
Oct 19 22:54:58 slackware kernel: cx88[0]: Calling XC2028/3028 callback
Oct 19 22:55:59 slackware last message repeated 48 times
Oct 19 22:56:02 slackware last message repeated 3 times

Tried to tune a channel in Kaffeine, get: kaffeine(2015) DvbDevice::frontendEvent: tuning failed

Xine and mplayer freeze trying to channel lock, Mythtv cannot lock on any channel.

Tried using a rc7 of the 2.36 kernel, get same problem... nothing after 2.6.34.7 seems to work!