I'm using a Radeon 7500 vid card. Everything displays on both the monitor and the tv until X loads. Then the tv goes wonky and I can only see things on the monitor.

I tried setting the HorizSync and VertRefresh to 30-50 and 60, but that didn't help. Anybody have any suggestions?

From my experience the areas that affect TV output are region, refresh rates and modeline. So the questions to ask are:

Where are you in the world? (Could be refreshrate problem - I set mine to 50 - 60 in PAL land to cover all the bases.)
Have you a valid modeline? (Again could be where you are in the world, but also a size your TV can display.)
How are you outputtin your TV signal? (Svideo, composite? Could have a bearing on it.)
Are you trying to plug the TV and the monitor in at the same time? Think Myth prefers one or the other, but not both.)
Regards

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Version:R8
Intel C2D 7400, Nvidia 5600 via HDMI to Samsung B37B650TW (PAL), Asus P5QL-E mobo, 4Gb PC6400 DDR2 ram, Samsung Spinpoint 500 Gb & 1Tb drive, Nova-HD-S2 (x2)

I'm in the US, so I'm usin' NTSC.
What's a modeline?
I'm using a composite cable from my vidcard to the tv.
Originally I didn't have the monitor plugged in, jus' the tv. But then the tv went all wonky when X started. So I plugged the monitor in. As long as I'm not running X, I can see things fine on the monitor and tv. But as soon as X comes up, the tv goes haywire.

A modeline is how you tell X what timing to use for your video output device. Since a TV isn't a multisync device like a monitor you need some fairly specific ones. Look in your /etc/X11/XF86Config-4 file You need to have

In your "Monitor" section. along with appropriate modelines. For example:

Hmm. I set VertRefresh to 60, not 60-60. I wonder if that matters.

So do I change one of the lines, or jus' add the tv modeline?

I made the changes, but the tv still goes all wonky.

No it doesn't.

Just add it and make sure that the default resolution is set to 640x480 below in your "Screen" section.

I tried changing the color depth from 16 to 24 an' the res from 8x6 and 6x4 to just 6x4, but that didn't work either.

I also had this problem the second time I installed. Im guessing it only happened the second time because I got the whole system set up with only a monitor the first time and then just dropped it into place with it being hooked up only to the TV.

When I reinstalled KnoppMyth (had to fix my partitions), I had both a monitor and a TV hooked up to my box. I noticed that during the install it was both on the TV and the monitor. When it finally came to booting up the completed system the first time i wasnt so lucky. after the splash screen fully loaded and that progress bar filled, my screen would go black... Before I got too alarmed I simply unplugged the monitor so that only the TV was being used as an output, rebooted and the problem was solved. Hope this helps you

BTW i wasnt sure if this was exactly what you had meant, but seeing as my issue was somewhat similar, it couldn't hurt to try

I originally had the radeon 7500 installed with the same negative results on the tv. I replaced it with a geforcefx 5200 which solved the problem on my 27" tv but not my 13". Having done a search I realized that this has been a problem for others with that card.

I originally installed with just a tv, no monitor. However, the tv went wonky when X loaded, so I had to get out a monitor. Anyways, I ended up with some new hardware, so I'm gonna try this again with a 6600. Hopefully that'll fix my problem.

Okay, I reinstalled using my new hardware as listed in my sig. I was able to get pretty much everything else working. However, I still can't get video on my tv. It's a different problem than the one I had before, though.

Using the ATI 7500, I would see the boot info on the tv and the monitor, and the tv would go wonky when X loaded.

Now with the nVidia 6600, I only get video on the monitor. I never see anything on the tv.

I'm thinkin' it's because it doesn't know the use the connector the tv is on, but I'm not sure how to change that.

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KM R5E50; K8NGM2; A64-3800+; 1024MB PC3200; LG DVD-RW; Seagate 750GB; 6600 PCI-E; Onboard sound; Hauppauge PVR-150

I'm in the same boat here. (Radeon 9000) I'm a lightweight with linux but I'm learning. (I have my frontend booting from hard disk and my /myth connected via NFS, so I'm not totally worthless! )


The normal boot and shut down work just fine, it's only when the Gnome (GDM) starts up that the screen goes goofy. I get a mangled display on my s-video connected tv, but my monitor is fine. I believe I'm in 640x480 mode but I'm not sure yet how to verify that for sure.

I'm using:
SubSection "Display"
Depth 24
###Modes "800x600" "640x480"
Modes "640x480"
EndSubSection


Section "Monitor"
Identifier "Monitor0"
Option "DPMS" "true"

HorizSync 30 - 50
VertRefresh 60

I've commented out all modeline 's except for the magic TV one.

# The "magic" TV modeline borrowed from someone else
Modeline "640x480" 25.175 640 664 760 800 480 491 493 525 #60Hz


One thing I noticed is all the others have things like +Hsync or other such...

# 640x480 @ 60Hz (Industry standard) hsync: 31.5kHz
#ModeLine "640x480" 25.2 640 656 752 800 480 490 492 525 -hsync -vsync


Any thoughts on if this might have something to do with it?

Thanks all for any help

Are you sure that your display is using the 24 color mode? At one point, I think mine was tryin' to use 16 color mode.

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KM R5E50; K8NGM2; A64-3800+; 1024MB PC3200; LG DVD-RW; Seagate 750GB; 6600 PCI-E; Onboard sound; Hauppauge PVR-150

Honestly dont know how to tell.

Im happy just to be able force it to 640x480 though. Starting to get there!

Seems like the quick fix is an nvidia card, but Id like to get this card working if I can.