[mythtv-users] (OT) Easy 'realtime' Modeline generator?

[junk_inbox at comcast.net]

  Thanks!   I just had to generate some 'baseline' modelines for the resolutions I was tyring to test (since xvidtune only lets you adjust existing modelines), but then was able to use 'xvidtune' to get a few different resolutions working perfectly on my projector:
     640x480    720x480   768x483  800x600

  All modes are interlaced, but suprisingly enough, at 640x480 and 800x600 there is no percivable flicker.  For some reason I was not able to get the 720x480 and 768x483 modes to a high enough refresh rate to eliminate the interlace flicker, so these resolutions unfortunately produce a noticable amount of interlace flicker.  

  Anyways I've set it to 800x600 and am very happy with the results.  Nice & sharp & flicker free! ;-)

  One other question...   I've setup the modelines for all of the above resolutions, and in the Monitor section have set the "modes" line to a list of the resolutions in the order that I want to use them (something like this:  Note that I'm at work now so I can't cut & paste the exact line, but I think this is correct:)
       Modes: "800x600" "768x483" "720x480" "640x480"

  The KDE Graphical boot executes in 800x600, but then switches down to 768x483 before getting to the X login screen.  And then 800x600 isn't available within X.  So I deleted the other resolutions from the "Modes:" line (leaving only 800x600), and it now stays in 800x600 through the whole process, but now the other resolutions are not available to me within X... So what do I have wrong that would cause it to behave like that?!?   TIA...    (If you need my conf files, I'll have to send them this evening when I'm home again...  TIA)

--
Jeff


> xvidtune
> 
> emike
> 
> junk_inbox at comcast.net wrote:
> 
> >I just hooked my frontend box up to my very old Sony CRT Video Projector (Circa 
> 1986) via VGA and a special modeline to generate 15khz output (768x483 @ 59.94Hz 
> Interlaced).  I had to use an old Matrox video card that would sync down to 
> 15khz and generate Composite sync.  Here's the modeline I'm currently using that 
> works pretty well (other than having the left and right sides of the display 
> chopped of by roughly 10 pixels): 
> >   ModeLine "NTSCspec-59.94i" 14.318 768 784 848 910 483 484 492 525 Interlace 
> -CSYNC
> >
> >Again, it's working fine, but this modeline is 14.318Khz, and my projector is 
> capable of scanning up to 26Khz.  I'd like to optimize the display mode to take 
> advantage of this, and hopefully eliminate most of the interlace flicker.
> >
> >So I tried different Modeline settings, and it was a real pain to test 
> different modes as restarting X didn't seem to take the new modeline, so I would 
> have to re-boot inbetween changes.  And if the modeline wasn't right, then X 
> would fail to load and I would have to connect a standard 'vga' monitor to 
> display the text mode display (which is 31khz scan rate) so I can edit the 
> config file to try a different modeline.  Then I re-boot again with the 
> projector connected to try it out... After about 20 attempts at different mode 
> lines and having very limited success, I decided I'd just have to live with the 
> 15khz mode for now.  (Note: I was using a couple of online modeline calculators 
> on my Laptop to generate modelines that I was trying on the Linux box, not just 
> randomly trying different settings!)
> >
> >So as my subject line asks...  Is there a 'realtime' modeline tool (similar to 
> "PowerStrip" for the PC) for Linux?  You know, something that you can select 
> different resolutions and adjust things dynamically, and hit 'esc' to revert to 
> a 'working' display if you end up with an unusable display?  Or do I have to use 
> a PC and PowerStrip to determine what works best with my projector, and then 
> generate a modeline from PowerStrip?
> >
> >If it makes any difference, the frontend box is a P4 @ 800Mhz running FC3, and 
> the Projector is a Sony VPH-1030Q1 with the following specs:
> >  VPH-1030Q  (Low serial# 50xxxxx - only up to 26KHz) 
> >  Lumens: 500  
> >  Contrast Ratio: 15,000:1  
> >  Horizontal Scanrate: 15-26KHz 
> >  Vertical Scanrate: 50-100Hz
> >  RGB Bandwidth: 15MHz
> >  Composite Sync
> >
> >Thanks in advance... 
> >
> >Jeff
> >
> >  
> >
> >------------------------------------------------------------------------
> >
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