Its not the ROM or modem. I think its the new Wifi firmware. I've started a thread to collect Wifi firmware versions.
[WIFI] Firmware version & Battery drain fix - xda-developers
In the meantime, if you want u can experiment. I've created update.zip packages to update/overwrite the wifi firmware (it's in /system/etc/wifi).
You can try to use the older (DXJPA) wifi firmware and see how that does in terms of power.
If you don't like it, you can put back the XXJPY wifi firmware with the other package.
Let me know your findings, if u try it out.
DXJPA wifi firmware is working fine with my XXJPY rom. Gonna check out the battery usage.
FYI:
DXJPA: Firmware version = wl0: Jun 4 2010 14:21:21 version 4.218.214.3
XXJPY: Firmware version = wl0: Nov 16 2010 08:56:21 version 4.218.250.38
Attached Files
File Type: zip update-wifi-dxjpa.zip (656.0 KB, 599 views)
File Type: zip update-wifi-xxjpy.zip (646.1 KB, 389 views)
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