a few weeks back i asked the list if they could produce a couple compadible modelines for me in XF86 so i could use real low res for full screen MPEGs. most of the response of what i got was that the information i had was not right, or something ..anything but XF86's fault.
ANYWAYS. i got this reply from a guy on one of the newsgroups(not sure which). And i wanted to post this so others could use these modelines if they were having trouble (its at least a place to start!) These modelines run for me on a 16MB TNT with 300Mhz ramDAC, using a Princeton E0500 (30-70 hsync 50-120 vsync 15") Modeline "320x240" 15.75 320 360 376 400 240 240 244 245 doublescan And i can get this mode to run by changing my hsync to 30-62 and vsync to 50-100, but i lose support for 1024x768 with a dotclock of 85. If i keep it to my "normal" sync rates the vsync for this modeline jumps to 161kHz ModeLine "400x300" 17.58 400 440 472 512 300 301 302 312 doublescan see the original message below. I still do think XF86Setup generates invalid modes for below 640x400 even when every piece of information is input correctly. Hope this can be fixed soon. What is the use of these modelines? the only use i can see is playing VideoCDs in fullscreen mode while using MpegTV (www.mpegtv.com) nate ----------------------------------------[mailto:[EMAIL PROTECTED] ]-- Vice President Network Operations http://www.firetrail.com/ Firetrail Internet Services Limited http://www.aphroland.org/ Everett, WA 425-348-7336 http://www.linuxpowered.net/ Powered By: http://comedy.aphroland.org/ Debian 2.1 Linux 2.0.36 SMP http://yahoo.aphroland.org/ -----------------------------------------[mailto:[EMAIL PROTECTED] ]-- 7:43pm up 83 days, 7:13, 2 users, load average: 2.40, 1.88, 1.75 ---------- Forwarded message ---------- Date: Mon, 08 Nov 1999 23:17:49 +0100 From: root <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: DOUBLESCAN bug in NV4 driver (and fix) Hi ! I have found on DejaNews that you had a similar problem. Here is my quick hack. I have a 8MB Riva TNT. I use it with Linux/Mandrake 6.1 + XFree 3.3.5. I noticed that 320x240 and 400x300 doublescanned modes did not worked properly with my old 800x600 monitor. So I decided to bring back my high-end office's monitor (which has a kind of integrated frequency meter) to make things clearer... Indeed, the 320x240 output by my TNT had a vsync=62.6KHz instead of 31.5Khz and the 400x300 one, had vsync=69.8KHz instead of 35KHz !!!! So this XFree 3.3.5 NV3 driver myteriously multiply the vsync by TWO !!! After having played a little with modelines, I finally found a quick turnaround to make these doublescanned modes work: simply divide by 2 the mode's dot clock: Modeline "320x240" 6.3 320 360 376 400 240 240 244 245 Doublescan will give 31.5KHz/60Hz, and ModeLine "400x300" 9 400 440 472 512 300 301 302 312 Doublescan will give 35KHz/56Hz. (Of course, you'll also need to lower your 'HorizSync' and 'VertRefresh' values because XFree will think that you want to use a 17.5KHz/28Hz mode) Conclusion and Patch: In the XFree source (in riva_xaa.c, in RivaInit()? ), only one line should be added to make doublescan modes work: if (mode->Flags & V_DBLSCAN) mode->Clock /= 2; It would be nice to fix this in the source code for a next release of the XFree86 server... regards, Ludovic Drolez.
