once in a while a rectangle in the middle of the screen for 1 second

[nicrnicr]

Hi

I have Kubuntu 14.04 with KDE 4.13.3, Grub 0.97-29ubuntu66 and Windows 7 is also installed.
This is a laptop Aspire 5750G 64 bits from ACER with GPU
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
There is a RAM of 8GB and one HD

Once in a while, I have a rectangle which appears in the middle of the screen for one second and which shows for instance 40%, 70%, 60%, 90% or whatever percent. Please, what is this? :-)
How could I get rid of it?

PS: I put system as prefix but I'm not sure if this comes from the system.

[vinnywright]

were you on battery power at the time ??

if yes ,,,,it was probably the screen brightness dropping down due to input(keyboard,mouse/trackpad) inactivity .

VINNY

[nicrnicr]

Thanks vinnywright, but my computer is always pluged.

[CrashTestDummy]

I've just put a new thread up with the same question. This little window isn't an issue, I'm just curious and I'm also wondering if it's possible to prevent the window from appearing.

I think Vinny might have the answer in my case, however, is there a way to prevent it from appearing?

[Snowhog]

Try System Settings > Power Management > On AC Power and uncheck Screen Brightness.