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Open Settings menu. Disable auto adjust brightness removing the tick. It works for me.
Same problem even after the sony have changed my old tablet xperia z
Same problems here! I bought the tablet a few days ago, I updated to the latest official SONY adnroid 4.3 and my problems are:
1) Flickering in Chrome when typing with the Sony keyboard
2) White blank screens in Chrome with only the toolbars viewable. It fixes only after reboot...
3) Installed Firefox as a Chrome substitute, and there is also some mild flickering when typing.
4) Skype crashed every single time I tried to open it, but after reinstalling it it works fine.
SONY should address these issues as soon as possible!