Is your square cursor problem the old "hardware cursor" chestnut perhaps.
Try this in the Device section:
On 2/16/07, murf <murf at syndicate7.net> wrote:
>> On Thu, 15 Feb 2007, John Allen wrote:
>> > Jason Corcoran wrote:
> >> I have been using Ubuntu 5.1 here in work for the last while, it is a
> >> image running under XP.
> >> Every thing has been running fine, and I know if it ain't broke.., but
> >> wanted to have a look at edgy.
> >> I have heard it can be a bit flaky with different hardware. From
> >> experience is this with exotic hardware or bog standard stuff?
> > Working all the time with Edgy, no problems. I even have Feisty on my
> > desktop, and laptop, and mostly its OK too.
>> Some of the lads in work here have upgraded to etch, and are having
> serious cursor problems on their second displays. The hardware is lenovo
> T42/T60's with ATI cards, and they were all running dual head with the
> display spread across both monitors.
>> After the upgrade, it seems there was a problem with the ATI drivers
> (binary, boo! hiss!) that causes the cursor to change to a large square
> (yes, a large square same colour as the background) if the two displays
> are not exactly the same resolution.
>> Most irritating! Other than that, there's been no problems. :)
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