mouse cursor turns into big white square on pwr resume

[Casio]

Ubuntu set to defaults. Leave machine alone until Ubuntu goes into sleep mode i.e. monitor screen goes blank.
Press power on switch for laptop.... Ubuntu wakes up to the log on screen... but the mouse cursor has turned into a big white square approx 4cm x 4cm in size.

As a result it makes it rather difficult to click on anything.

Log in... Ubuntu desktop appears and the mouse cursor is back to being a nice sharp pointy thing!

Repeatable fault.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Casio (casiobearing)]

The problem occurs after the Video output to the monitor is switched off (the LCD monitor said it was powering off) following the gradual fade out of the login screen. i.e. I guess this is when the video card is put into deep sleep or power saving mode?

The photo attached was taken after I pressed the docking station power on button to wake the laptop up (wagging the mouse did nothing, so I assume the laptop had gone into a deep sleep state or whatever Ubuntu does when the laptop isn't used for a long time.

So it looks like whenever the mouse cursor pointer is stored, that location loses its memory when the laptop sleeps, and then when it wakes up, you end up with a big white square instead of the mouse pointer image.