Today, 1 day later, my second DHD is now having the exact same problem with the proximity sensor.
When I make a call, the screen immediately goes black, and the device no longer responds to any button (not even the power button on top). The ony way to get the device back to life is by removing and reinserting the battery.
Video of the problem
When I receive a call, the screen stays unlocked, even when the device is placed against my ear, so I end up with my ear pressing the active screen....
I've read more complaints about this exact problem on the tweakers.net forum. It is still unknown whether this is a hardware of software failure.
The problem seems to be related to the lightsensor, when holding a locked DHD in front of a bright light source, the device wil unlock (as long as you keep it in front of the light).
It might be, that when used in bright daylight a DHD will function properly.
Also, when calling using the headset, the problem does not occur. When inserting a headset in a "locked" DHD, it will wake up.
Some facts, to "bust" some myths about the problem:
- It seems the problem can happen on all DHD's, not just devices with a particular S/N, software version, carrier (telco) or color.
- It has something to do with the light sensor (which is the same sensor as the proximity sensor) since the device unlocks when held in front of a bright lightsource, some users claim their device works well, as long as they are in daylight.
- The DHD uses a CM3602 proximity/light sensor, the same as a regular Desire
- The problem might not occur immediately after purchase, sometimes it takes a few days before it starts, thus switching your DHD for a new one might only solve your problem for a few hours/days (this is what happend to my second and third... yes third device)