Date: Thu, 01 Jan 1998 11:50:34 -0500 (EST) From: Jim Durham <durham@w2xo.pgh.pa.us> To: Shoma & Ash Yadav <shomash@mbox4.singnet.com.sg> Cc: questions@freebsd.org Subject: Re: changing screen res in X Message-ID: <XFMail.980101121500.durham@w2xo.pgh.pa.us> In-Reply-To: <01bd167e$b2e22f60$36cd15a5@area51.singnet.com.sg>
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On 01-Jan-98 Shoma & Ash Yadav wrote: > >John, Doug, Alex >Thanx a lot for your replies ... and wish U all a Hap-Hap-Happy New Year ... >But ... I am still unable to get my SVGA display to go beyond the 320x200 >that it defaults to. Even after removing the 320x200 entry for 8 bit depth >in SVGA definitions in XF86Config . If anyone out there has managed to run >the X server on a dell VS 17X monitor attached to a Dell Optiplex 590 cd u >pls send me a copy of your XF86Config file. >Any other advise is also appreciated. FYO, I do not have any extra graphics >boards on this machine and the Ctrl-Alt-+ option does not change the >resolution. Since my experience with FreeBSD has been only abt 2 days wd >appreciate all the help to get this running. > >thanx >Ash ;) > I just went through this with my PC at work running an Mach-64 board. I wish I had kept better notes, but, even though you're dealing with a different board, certain things apply.. More than likely, the reason you are not getting mode assignments to 640x480 and higher resolutions is that X thinks these are outside the capability of your monitor, and perhaps your card for those higher than 640x480. A tip-off to this is to start X from a VTY window, then, leave X and check the start-up messages. "Mode 640x480 does not exist" or similar messages are generated when the required sync ranges for 640x480 fall outside what X thinks your monitor will stand. The other problem could be that the virtual resolution or real resolution specified in XF86Config requires more video ram than you actually have. If you know the sync ranges of your monitor, check that you have as wide a window as possible. Most modern monitors will take 50-70hz vertical and 30-50khz horizontal. Be careful to not exceed the horiz range that your monitor will stand. Some monitors could be damaged by running the horizontal freq outside the specified range, although I've never seen this happen..it could, so be careful..Mostly, they just go to the "slanting horizontal line scramble" mode, like an old TV with a misadjusted Horiz hold control. The startup messages should leave tracks on which modes were rejected, but not why. The "why" you have to figure out yourself. You will find xvidtune very helpful if you get some modes working. It allows you to center the image and tweek the size. There used to be a couple of files that were shipped in the "doc" directory of /usr/X11R6/lib/X11, but I noticed that in the last few releases, they are gone. I have these somewhere if you need them, as they explain the theory of scan rates and modes, etc. Good Luck... Jim Durham <Television Engineer-Unitel Mobile Video, Pittsburgh> <Computer Consultant/Hobbyist> <Amateur Radio: W2XO> <Web:http://www.w2xo.pgh.pa.us>; <Packet:W2XO@W2XO.#SWPA.PA.USA.NOAM>
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