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Home Forum Hardware & Machines PC Computers Fantastic latency on Live CD, horrible on HDD

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TOPIC: Fantastic latency on Live CD, horrible on HDD

Re:Fantastic latency on Live CD, horrible on HDD 16 Jun 2012 04:24 #20993

  • Rick G
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I know already that telling people to interrupt the boot and go to a terminal session to use xorg-configure just freaks them, so will have to find an easier method for the Linux novice.

It has been a while but I think I started here..

wiki.ubuntu.com/X/Config

This suggests that a simple solution would be to use gedit to create the file, save to proper location and then edit it to fit your needs.

also from my notes I downloaded a while ago...
In order to generate xorg.conf you need to switch to one virtual console using the key combination CTRL + ALT + F1.

Now execute the following commands:

# sudo service gdm stop
This command will stop the X.
Now we need to generate the xorg.conf file:
# sudo Xorg -configure
This has generated the file in ~/xorg.conf.new.
We need to make the X using it so we have to put this file inside /etc/X11/
# sudo mv ~/xorg.conf.new /etc/X11/xorg.conf
After moving this file to the proper location you can start the X again and see what happens:
# sudo service gdm start

Rick G
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Re:Fantastic latency on Live CD, horrible on HDD 16 Jun 2012 05:53 #20996

  • ArcEye
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Hi Rick,

Thanks, that is pretty much all that is needed.

I couldn't find a simple Ubuntu wiki to link directly to, so will probably just use that
Telling people to interupt GRUB and edit the kernel params to force runlevel 3 etc. was never going to be a winner!

The Linuxcnc troubleshooting wiki pretty well covers things, except that it doesn't explain that you cannot use Xorg -configure when there is a running X server.
That has come up as a problem a few times on threads.

regards
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Re:Fantastic latency on Live CD, horrible on HDD 16 Jun 2012 06:19 #20997

  • taiden
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ArcEye wrote:
Hi

Thanks for the file, now I have started looking into it, a couple of questions.

Is your monitor CRT or TFT/LCD etc?

How did you arrive at the refresh rates, do you have the manual or was that what xrandr threw up for that resolution?

regards

My monitor is an old LCD monitor. I found the user manual online and punched in the manufacturers range. VESA seemed to pick the best one for me and it worked. I hope it works as smoothly on other systems too.
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Re:Fantastic latency on Live CD, horrible on HDD 16 Jun 2012 06:19 #20998

  • ArcEye
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Wiki now edited to incorporate both items
wiki.linuxcnc.org/cgi-bin/wiki.pl?Troubl...g#Using_Vesa_Drivers
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Re:Fantastic latency on Live CD, horrible on HDD 16 Jun 2012 06:53 #21001

  • taiden
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excellent, glad my post could possibly help others in the future!

Really excited to get this thing hooked up to my stepper motors. Psyched that I finally got sub 10k latencies. Thanks again all for the help
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Re:Fantastic latency on Live CD, horrible on HDD 17 Jun 2012 01:21 #21030

  • Rick G
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Wiki now edited to incorporate both items

Looks good ArcEye, that should help a lot of people.

Rick G
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