[Sony Xperia S, Acro S, Ion] SysGhost:
Good to know...

I just wanted to report in that there are some errors repaeating over and over during "Andoid is upgrading..." dialogue, when starting the device freshly and cleanly flashed with 12.1-b05:

E/cutils-trace( 1219): Error opening trace file: No such file or directory (2)

This error repeats for each app that Android is upgrading.

Here's a larger sample of the log:

...
E/cutils-trace( 1239): Error opening trace file: No such file or directory (2)
I/dex2oat ( 1239): /system/bin/dex2oat --zip-fd=5 --zip-location=/system/priv-app/Mms/Mms.apk --oat-fd=6 --oat-location=/data/dalvik-cache/arm/system@priv-app@Mms@Mms.apk@classes.dex --instruction-set=arm --instruction-set-features=default --runtime-arg -Xms64m --runtime-arg -Xmx512m --no-watch-dog --swap-fd=7
I/dex2oat ( 1239): Decided to run without swap.
I/dex2oat ( 1239): dex2oat took 7.922s (threads: 2) arena alloc=210KB java alloc=3MB native alloc=5MB free=6MB
I/PackageManager( 630): Running dexopt on: /system/app/Browser/Browser.apk pkg=com.android.browser isa=arm vmSafeMode=false
E/cutils-trace( 1241): Error opening trace file: No such file or directory (2)
I/dex2oat ( 1241): /system/bin/dex2oat --zip-fd=5 --zip-location=/system/app/Browser/Browser.apk --oat-fd=6 --oat-location=/data/dalvik-cache/arm/system@app@Browser@Browser.apk@classes.dex --instruction-set=arm --instruction-set-features=default --runtime-arg -Xms64m --runtime-arg -Xmx512m --no-watch-dog --swap-fd=7
I/dex2oat ( 1241): Decided to run without swap.
I/dex2oat ( 1241): dex2oat took 5.022s (threads: 2) arena alloc=194KB java alloc=1996KB native alloc=3MB free=4MB
I/PackageManager( 630): Running dexopt on: /system/app/DocumentsUI/DocumentsUI.apk pkg=com.android.documentsui isa=arm vmSafeMode=false
E/cutils-trace( 1243): Error opening trace file: No such file or directory (2)
I/dex2oat ( 1243): /system/bin/dex2oat --zip-fd=5 --zip-location=/system/app/DocumentsUI/DocumentsUI.apk --oat-fd=6 --oat-location=/data/dalvik-cache/arm/system@app@DocumentsUI@DocumentsUI.apk@classes.dex --instruction-set=arm --instruction-set-features=default --runtime-arg -Xms64m --runtime-arg -Xmx512m --no-watch-dog --swap-fd=7
I/dex2oat ( 1243): Decided to run without swap.
I/dex2oat ( 1243): dex2oat took 2.831s (threads: 2) arena alloc=38KB java alloc=956KB native alloc=2MB free=5MB
I/PackageManager( 630): Running dexopt on: /data/app/com.google.android.apps.plus-2/base.apk pkg=com.google.android.apps.plus isa=arm vmSafeMode=false
E/cutils-trace( 1245): Error opening trace file: No such file or directory (2)
I/dex2oat ( 1245): /system/bin/dex2oat --zip-fd=5 --zip-location=/data/app/com.google.android.apps.plus-2/base.apk --oat-fd=6 --oat-location=/data/dalvik-cache/arm/data@app@com.google.android.apps.plus-2@base.apk@classes.dex --instruction-set=arm --instruction-set-features=default --runtime-arg -Xms64m --runtime-arg -Xmx512m --no-watch-dog --swap-fd=7
I/dex2oat ( 1245): Decided to run without swap.

Despite the errors, it works as intended... so I guess the error isn't of any importance for now. I just wanted to put it here.

Perhaps it shouldn't be an error, but a warning instead?

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I can also report that the bluetooth problem with A2DP headsets still remains. They are useless as it is now.

Sad, because I really want to use my wireless headset. =S

One can listen to music and other audio, but as soon as one tries to answer a call with a A2DP headset, the whole bluetooth layer acts up and goes completely wonko. Only a full reboot can restore the bluetooth to normal operation again.