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Getting image corruption with Ubuntu...

Shawn

Shawn

Lifer
I installed Kubuntu 5.10 on an old IBM computer with a 1GHz P3 and 256MB if ram. However I was getting image corruption so I decided to get the latest version of Ubuntu and try that instead. However, even in the install program of Ubuntu 6.06 I am getting image corruption.

pic

If I lower the refresh rate to 60hz it's not as bad... pic 2.

Also if I lower it down to 1024x768 at 60Hz the corruption goes away.

Any ideas? It's an Intel 815 chipset with onboard video. It works fine in windows.
 
Well I have a couple ideas, but they are probably bad ones.

I haven't seen problems like that before, unfortunately.

So the pictures are a bit blurry (which is understandable). But the colors.. is that just vertical blue bars or something?

For some reason I remember reading somewere something about video card bandwidth. Like some of the crappier video cards have a limitation on the amount of bandwidth aviable to the display and when you reach the limit you start to run into problems.

But I don't know.

Try running at 16bit color. See if that helps any also.

Also I beleive that all LCDs run at 60hz refresh rate, so leave it at that.

If your feeling adventurous you can try editing your /etc/X11/xorg.conf directly and taking a look at your "Device" and "Monitor" sections and maybe the "Screen" sections.

For instance I found this from a sample xorg.conf off the internet:
Section "Device"
Identifier "Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller"
Driver "i810"
BusID "PCI:0:2:0"
VideoRam 16184
Option "DisplayInfo" "FALSE"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 28-60
VertRefresh 43-60
EndSection

Just be sure that if your going to play around with it that you make a copy of the file. If you edit it wrong it will cause X not to start so then you would have to go in through the command line and copy over the edited file with the backup and restart it.

To do this you'd go like
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
to do the backup and then the oppisite to restore it.
to restart X you'd go
sudo /etc/init.d/gdm restart

But only do that if your adventurous. That stuff can get confusing if your not used to linux.

See if there is any usefull information at http://www.thinkwiki.org/wiki/ThinkWiki
Also maybe Fedora forums may be usefull.

It would be usefull to know the actual model for the IBM computer. The 'i810' is a driver for a bunch of different video cards.. the only Thinkpad that has a real i810 was a G40 (according to the thinkwiki) or something and it had a 2.x ghz Pentium 4 M proccessor, so it's not yours I figure. (which is ok.. most other Intel chipsets are actually better then that one, the driver is named for it because it was the first that was supported I think)

It'll make it easier to find detailed information on your laptop.
 
Thanks for the help. I looked into it last night and it seemed to a common problem with the 815 video drivers. They also suggested changing the color depth to 16bit and it fixed the problem. Not sure why it works fine in windows but at least everything it working now.
 
That's cool.

Also I don't know why I thought you said 810 when you said 815. Guess I was just tired. :/
 
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