Rounds and Ovals.Graphics issues

Todd Zuercher
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10 Jan 2016 07:25 #68150 by Todd Zuercher

Replied by Todd Zuercher on topic Rounds and Ovals.Graphics issues

I have an Asrock Q1900M-Pro3 plugged into an old cheezy VGA LCD flat panel (only 1024x760) and it has no problems getting the circles round using the live CD Wheezy Linuxcnc install. I have not tried it with a wide format screen. I could try one on Monday, but I fully expect it to work fine.

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andypugh
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10 Jan 2016 10:43 #68151 by andypugh

Replied by andypugh on topic Rounds and Ovals.Graphics issues

tommylight wrote:
home automation with a ZX Spectrum over 20 something years ago, a robot arm controlled by that same ZX, etc etc). Damn i miss that time.

So do I: www.worldofspectrum.org/infoseekpub.cgi?regexp=^Andy+Pugh$

To keyboard, when you did xrandr, did you get a valid resolution for your actual monitor in the results?

I didn't. Which is why I made an xorg.conf and forced it to use that.
I think a refresh rate of 0 is correct for a digital flat panel.

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andypugh
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10 Jan 2016 11:07 #68152 by andypugh

Replied by andypugh on topic Rounds and Ovals.Graphics issues

This is my xorg.conf.

Create a file called /etc/X11/xorg.conf

Section "Device"
    Identifier    "Configured Video Device"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
    HorizSync       30-80
    VertRefresh     60-75
EndSection

Section "Screen"
    Identifier    "Default Screen"
    Monitor        "Configured Monitor"
    Device        "Configured Video Device"
    DefaultDepth    24
    SubSection "Display"
        Depth    24
        Modes     "1280x1024"
    EndSubSection

Then change to mode until you get what you want. You probably need to reboot.

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tommylight
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11 Jan 2016 01:25 #68169 by tommylight

Replied by tommylight on topic Rounds and Ovals.Graphics issues

The refresh rate of 0 is not correct for analog outputs, it needs to be 60Hz and above, older monitors will complain or just plain switch off with a message "frequency out of range" if you set anything above 60Hz, but newer ones cope with 85Hz easily.
As for digital panels connected via DVI on both sides, i do not know for sure since i never had problems with them so i never checked, but i know they use signalling similar to HDMI, namely 2 very fast channels for sending information about each and every dot on the screen. So Andy might be right that digital panels can do with a 0Hz refresh, but then again graphic cards do have to know how many frames per second to send to the monitor, so i am not sure. Me thinks this to be tested later, when santa bring more time.

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keyboard
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11 Jan 2016 02:45 #68171 by keyboard

Replied by keyboard on topic Rounds and Ovals.Graphics issues

Thanks Andy and Tom,
Your encouragement is making me more determined to get to the bottom of this. As mentioned by Andy I set out to create an xorg.conf and got into new territory of Linux . I will post a detailed list of errors that show up.

Regards.

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andypugh
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11 Jan 2016 12:07 - 11 Jan 2016 12:07 #68179 by andypugh

Replied by andypugh on topic Rounds and Ovals.Graphics issues

keyboard wrote:
As mentioned by Andy I set out to create an xorg.conf and got into new territory of Linux

If you are unfamiliar with Linux then there are a few details that I left out.

To create the file, open a terminal and type "sudo gedit". This will open the text editor in a mode where it has the privileges to write to the /etc/X11 folder.
Paste the text from my post into the file, and save-as /etc/X11/xorg.conf

You should find that the screen display is set to 1280x0124 on the next reboot.

Then try editing the file to request different resolutions.

If you find that you end up with no video, you should be able to re-boot into safe-mode text terminal, then you can rename the xorg.conf file to something else, reboot, try other numbers, change the name back, and reboot.

To rename a file in Linux you can use the "mv" (move) command

sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.borked

Last edit: 11 Jan 2016 12:07 by andypugh.

The following user(s) said Thank You: Clive S

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keyboard
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21 Jan 2016 01:06 #68857 by keyboard

Replied by keyboard on topic Rounds and Ovals.Graphics issues

Sorry for the delayed response. I have modified the xorg.conf as per your example and tried various values for Horsync and Vertsync. No change. I went back in to check if the file saved with the changes and it does. I've rebooted or reloaded everytime and no change.

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andypugh
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21 Jan 2016 10:34 #68872 by andypugh

Replied by andypugh on topic Rounds and Ovals.Graphics issues

Does it at least change the resolution?

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keyboard
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21 Jan 2016 20:17 #68895 by keyboard

Replied by keyboard on topic Rounds and Ovals.Graphics issues

Problem Solved. Thanks to you Andy for being so persistent.

This morning started it up with a black screen and just a flashing cursor. Used the command " nano /etc/X11/xorg.conf " in command prompt (recovery mode). Changed : Modes "1280x1024" to " 1440x900" for the monitor and presto. :woohoo:

No more oval rounds.

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