Test version for IXUS iZoom 100g.
To fix USB remote control, it is necessary to detect USB_MASK.
1) Enable "Show Misc. Values":
CHDK Menu -> Miscellaneous Stuff -> Debug Parameters ->
Show Misc. Values [ * ]
The values of phy_status[0..2] should be shown on LCD
2) Plug/Unplug USB cable and tell me which value changed. Knowing the value with and without USB cable, we can define the mask.