STRIPES ON SCREEN

I INSTALL LINUXCNC A NEW TIME WITH UNBUNTU 8.04

AND ITS RUN BETTER AND FASTER THAN MY OLD COMPUTER HP P3

ALL IS GOOD BUT THE PROBLEM IS WHEN I LAUNCH LINUXCNC

THE SCREEN IS PLENTY OF STRIPES

ITS THE SAME THINGS WHEN I USE THE CD LIVE

BUT WHEN I CLOSE LINUX CNC AND WHEN I USE OTHER PROGRAM GIMP BY EXAMPLES !!!!! NOTHING WRONG;

MAY I HAVE SOMES REPONSES TO MY PROBLEM? I DON’T FIND ON WIKI

THANKS


RV

It sounds like your monitor is losing its vertical or horizontal sync: www.monitorservice.com/faqs1.html

The picture information is on the screen but the timing is wrong so it gets torn up. This can happen if the sync timing is too fast for the monitor, or the sync signals are in the wrong form. Sometimes with a marginal signal a mostly black or white border on the screen can confuse the sync. Sometimes the video driver will change the screen resolution or timing and make it faster than the monitor can handle. I would try changing the monitor to the best monitor you have handy. If that doesn't work try a different video card and/or change the driver in the /etc/X11/xorg.conf file. The vesa driver seems to work best. While in the xorg.conf file, check that the HorizSync and VertRefresh and resolution settings fit your monitor specifications. You need to look up the settings for the make and model of your monitor, guessing at these numbers rarely works. You need to have root privileges to edit the xorg.conf file. Using a terminal window, I use "sudo gedit /etc/X11/xorg.conf" to open the file. After making changes, you will need to log out or reboot to put the changes into effect. Sometimes these changes will make your screen stop working all together. If this happens, use the safe video option from the GRUB menu as your computer boots up.

(Generally, it is bad form to USE ALL CAPS in your messages.)
--
Kirk Wallace
www.wallacecompany.com/machine_shop/

Good call, John. I suppose another test would be to try GLXgears to see if the screen breaks.

I suspect it looks like this

www.linuxcnc.org/index.php/english/forum/21-axis/26058-axis-bug

The problem is openGL, the answer is in the thread

regards

Yes, the screen shown looks like it is synced and stable, but has pixel data corruption. It seems to fit the OP's symptoms better.

I have a similar pixel data problem with or without an OpenGL window with Intel motherboard video drivers. Finding a driver and Ubuntu version that works can be a real bugger. My old standby vesa driver doesn't seem to work with 10.04 on Intel boards, but works fine on 8.04.

The solution is the good one with the cd live it's ok for the screen

but before i try install ubuntu 8.04 directly on hard drive without linux cnc
and i install linux cnc 2.5 but now i have a message error :

linuxcnc require real times kernel 2.6.24-16 rtai to run

where i can find this loading

regards

rv

The solution is the good one with the cd live it's ok for the screen

Which solution - software libs?

but before i try install ubuntu 8.04 directly on hard drive without linux cnc
and i install linux cnc 2.5 but now i have a message error :

linuxcnc require real times kernel 2.6.24-16 rtai to run

You can't pick and mix unless you know what you are doing both in linux and linuxcnc

You need to install from the 8.04 based Linuxcnc Live CD, not the Ubuntu one
www.linuxcnc.org/iso/ubuntu-8.04-desktop-emc2-aj13-i386.iso

That will install 2.6.24-16-rtai kernel

Then follow the instructions on this site to first upgrade to 2.4.7 using synaptic and then change the repositoiries to upgrade to 2.5.1
wiki.linuxcnc.org/cgi-bin/wiki.pl?UpdatingTo2.5

You will need to install the software openGL libs again with the new install

regards