Oh, how bad! I just did ICS upgrade to my ARC LT15 
Now I'm unable to access configuration settings for Lock screen. I hate new photo slider option instead of mute/unmute slide option (mute/unmute slider I need in every meeting, foto option is pointless to me). Is there a way to get back mute/unmute slider in lock screen? Also while fiddling around this I got another issue - accidentally changed the teme - now my wonderfull blue Gingerbread wallpaper seems gone - I can't get it back. If there is someone lycky who din't upgrade to ICS yet please share this background to me! Looks like Sony designer/marketing people know nothing about ergonimics and are not aware that it is extremely fatigue to read small text on high contrast background
Unfortunately it's not possible to switch function on the "slider" of the lock in the phone. You can though just press the on/off-key when the lock screen is awake and you're able to turn off/on the sound easily. 
You can find all availalbe background pictures by going in to Settings - Display, also the one's that we provide with the phone. In that menu you can also change color scheme on the menu in the phone.
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