Hi, i just try your ipk with the your conf file. First it seems to work, but 3 times since yesterday, the Z's screen just became completely white and the Z needed a reset..
Another point : I use the cacko 1.23 rom with the overclock/underclock applet => when powernowd is running any change on this applet will freeze the Z.
hope it will help.
[Edit] I have uninstalled the powernowd package but i have the same behavior (The Z screen became white after resume, or even reboot !!). maybe it is something else i have done !!