configuring 1024 x 768 @ 100hz on my sketchy CRT DELL P991 monitor
SlackwareThis Forum is for the discussion of Slackware Linux.
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
configuring 1024 x 768 @ 100hz on my sketchy CRT DELL P991 monitor
My Monitor at 1024 x 768 runs at a maximum of 85hz in slackware. The screen is noticeably jittery. The monitor is has the same problem at the same resolution at the same hertz rate under Microsoft Windows XP. However, with XP, I am given one more option: 100hz. I've tried a number of different xorg configurations, none of which seem to work. I find the xorg.conf generated automatically by the latest stable official proprietary nVidia drivers makes my desktop look prettiest and gives me the most options in terms of hertz. Here is the xorg.conf generated by nVidia:
if you dual boot windows and have the nvidia drivers loaded open the nvidia display properties and in there there will be a button for advanced timing. check out the link here (i realize it says Xfree86 but i have used it with slackware 11 and Xorg). it is used to generate a modeline which you add to your monitor section in your xorg.conf, you also have to create a Modes section i believe.
what this will try and do is take the exact settings you use in windows in your 1024x768@100Hz environment and create a Modeline that can help linux get this same display setup. i have an unusual LCD monitor and i use this to try and maximize viewability.
if you dual boot windows and have the nvidia drivers loaded open the nvidia display properties and in there there will be a button for advanced timing. check out the link here (i realize it says Xfree86 but i have used it with slackware 11 and Xorg). it is used to generate a modeline which you add to your monitor section in your xorg.conf, you also have to create a Modes section i believe.
what this will try and do is take the exact settings you use in windows in your 1024x768@100Hz environment and create a Modeline that can help linux get this same display setup. i have an unusual LCD monitor and i use this to try and maximize viewability.
hope it helps
Thanks nadroj. Here is the Modeline your nifty program determined would suit my Monitor's 1152 x 864 resolution:
And As a result, when I do CTRL + ALT + Backspace, X11 hangs without an error message. Rebooting Slackware produces the same hand. Thus to get X11 working again, I did a CTRL + ALT F6 to get a command line which enabled me to revert back to my previous xorg.conf. Any other ideas?
edit: corrected image shack URL
Last edited by Drone4four; 11-24-2006 at 10:34 PM.
note the new section 'Modes'. this i think is what you were missing. try this restart X and see if it works.
also you said you wanted your display to work as it did in windows xp, as 1024x768@100Hz.. but your setting it up as 1152x864@110Hz?
edit: also remove the modeline from the screen section, it should just be in the monitor section. notice in your screen section you tell Xorg what resolutions to use, but you didnt specify 1152x864. i think you should rerun this calculator with the 1024x768@100Hz setting in windows and try that modeline for X.
note the new section 'Modes'. this i think is what you were missing. try this restart X and see if it works.
also you said you wanted your display to work as it did in windows xp, as 1024x768@100Hz.. but your setting it up as 1152x864@110Hz?
edit: also remove the modeline from the screen section, it should just be in the monitor section. notice in your screen section you tell Xorg what resolutions to use, but you didnt specify 1152x864. i think you should rerun this calculator with the 1024x768@100Hz setting in windows and try that modeline for X.
thanks again nadroj...tomorrow or the next day I'll input your suggestion (I can't right now) =D
Drone4four,
I have the exact same monitor (DELL P991) and a nvidia card as well. The recommended resolution for that monitor is 1280x1024 @ 85 Hz. Here is my xorg.conf, and it works fine. If you are using the drivers from the nvidia website (and i think you are) this should help.
also you said you wanted your display to work as it did in windows xp, as 1024x768@100Hz.. but your setting it up as 1152x864@110Hz?
This slipped my mind initially. I meant to specify 1152 x 864 then. As for your second point regarding why I chose 110Hz instead of 100Hz: The program you referred me to suggested I mark down 110 in the xorg.conf in order to achieve 100Hz as an option in xrandr. Or have I misunderstood the instructions?
jim_fields: Your monitor may be newer than mine. I don't know my monitor's age because like I pointed out earlier, I got my DELL P991 second hand. It took me a few weeks to realize it, but it has some pretty large writing burned into the screen. That means the previous owner had the monitor display a certain image 24/7/365. And I got this monitor two years ago. In sum, your DELL P991 can probably run 1152x864@85Hz without jittering like mad.
I've chosen not to try your xorg.conf because mine was customized using the nVidia drivers. Additionally, I'm sure other xorg specifications like our mice and keyboards are very different.
But thanks jim_fields for sharing your xorg.conf for reference purposes!
The program you referred me to suggested I mark down 110 in the xorg.conf in order to achieve 100Hz as an option in xrandr. Or have I misunderstood the instructions?
i never had to do that.. yet again my max is 75Hz so im not near your 100Hz. maybe its because its so high that it suggested what it did--not sure.
this is a quote from my previous post:
Quote:
notice in your screen section you tell Xorg what resolutions to use, but you didnt specify 1152x864.
I just used that nifty XFree86 Modeline Generator program to figure out what line I should add to my xorg.conf to allow for 1024 x 768@100Hz. Here is what it suggested:
Hmm, interesting, the nVidia control pannel gives me the 1152 x 864@110Hz option. Perhaps I could change that the 110Hz variable to 100Hz as nadroj suggests. My new xorg.conf therefore looks like this:
What is strange, is that even after clicking the save button in this nVidia control panel, nothing happens. The default resolution is still 1600x1200. wtf?
edit: grammar
edit2:added xorg.conf
Last edited by Drone4four; 11-26-2006 at 01:51 AM.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.
