I am pretty sure that when I was running 4.0.2 that if the screen was off, the volume rocker would not wake the screen or adjust the ringer volume. Now that I am running 4.0.4 I have been noticing that my volume has been muted a few times in my pocket. On my old Droid I used to have to run an app that would require a confirmation on volume changes for this very reason. I think if I was playing music it would adjust the headset or speaker volume, but I don't think it used to adjust ringer volume or turn on the screen otherwise. Am I imagining things or did this change with 4.0.4?