[ubuntu-za] Cursor flashing across screen

William Walter Kinghorn williamk at dut.ac.za
Wed May 5 10:22:35 BST 2010

Hi Robin,

Remember that if you use another monitor, first switch the PC off, then connect the monitor, then switch the PC on

Also check the Hor sync and Ver sync for that monitor, possibly on the net

You will then have to change the xorg settings to refect the settings

Have a look at this site, It is for 8.04 but might still help you http://people.uleth.ca/~daniel.odonnell/Blog/overriding-screen-resolution-on-xorg-in-ubuntu

Look here as well, this uses xrandr   https://wiki.ubuntu.com/X/Config/Resolution  ( from this site : Note that changes you make using xrandr only last through the current session. xrandr has a lot more capabilities - see man xrandr for details. ) but at least you can try some resolution until one works, then look for this section when it works "Setting xrandr changes persistently"


From: ubuntu-za-bounces at lists.ubuntu.com [ubuntu-za-bounces at lists.ubuntu.com] On Behalf Of Wesley Werner [wesley.werner at gmail.com]
Sent: 05 May 2010 10:39
To: robinbownes at afrihost.co.za; Ubuntu South African Local Community
Subject: Re: [ubuntu-za] Cursor flashing across screen

Hi Robin, I saw your post a while ago, but did not have any ideas on what causes this.

An old PC heh? What monitor is hooked up to the PC, an old CRT monitor? It could be the refresh rate is set too high, the monitor can't handle it and that's causing the flicker. If there's any way you can show us what it looks like?

A refresh rate of 75Hz+ is ideal, but for older monitors 50Hz-60Hz would work better. Check in the main Ubuntu menu System -> Preferences -> Display.

If you can swap the monitor out for another newer model to see if that works, and if it does not work then the graphics card could be damaged. Generally SVGA drivers pick up okay so let's assume the driver is fine until we can eliminate hardware failure.

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