LinHES Forums :: View topic - knoppmyth via VGA cable to HDTV

My solution was to get a (Nvidia) video card with DVI out and use a DVI to HDMI cable to the TV and this banished all problems....

snaproll wrote:

My solution was to get a (Nvidia) video card with DVI out and
use a DVI to HDMI cable to the TV and this banished all
problems....

That's if you don't count horrendous overscan as a problem.

Yes, VGA is dark, but at least you can see all of your picture.
I use DVI/HDMI grudgingly, due to the brightness factor. What
do you want to sacrifice? Ideally, get a large computer monitor
with DVI input.

manicmike wrote:

snaproll wrote:

My solution was to get a (Nvidia) video card with DVI out and
use a DVI to HDMI cable to the TV and this banished all
problems....

That's if you don't count horrendous overscan as a problem.

You've got a badly designed or configured TV. Most flat panel
TVs have a "no overscan" mode where you can drive them with a
signal at the panel's native resolution and get exact 1:1 pixel
mapping.

Quote:

When I was shopping for TVs last year, Toshiba was the only
brand I found that didn't have a no-overscan, 1:1 mode when
driven with a DVI signal. It sounds like yours is similarly
"broken".

so does anyone know if knoppmyth configures monitor settings each time it starts or only during installation?

It sounds like yours is similarly
"broken".

Grant_Edwards wrote:

It sounds like yours is similarly "broken".

Panasonic lxd600. No way to disable it.

Author:	ughpaul2 [ Mon Jul 14, 2008 7:55 am ]
Post subject:	knoppmyth via VGA cable to HDTV
do i have to do anything special to install knoppmyth on to a pc connected to an HDTV via a VGA cable? does it automatically detect the correct resolution setting? if i first install it to a pc connected to a regular monitor can i then move it to an HDTV, thru VGA cable, and have it still automatically detect the new resolution setting? how about moving from one hdtv to another? thank you

Author:	snaproll [ Mon Jul 14, 2008 8:23 am ]
Post subject:
I tried that with my Sharp Aquos, and while the resolutions could be set with the TV, or the Mythbox, or both, The picture was very dark, and no amount of fiddling with the Nvidia settings produced a satisfactory result. My solution was to get a (Nvidia) video card with DVI out and use a DVI to HDMI cable to the TV and this banished all problems....

Author:	Liv2Cod [ Mon Jul 14, 2008 9:52 am ]
Post subject:
I use VGA to connect my Pioneer CRT projection set. It uses 1080i only on its VGA input. In my case, autodetect definitely does NOT work. I must turn off autodetect and set the resolution with the proper modeline in the config file. The TV looks fabulous when driven from the VGA input, tho.

Author:	gezz [ Tue Jul 15, 2008 2:43 am ]
Post subject:
My experience is similar to Liv2Cod. I get a great picture via VGA on my Samsung LCD TV, but it did not autodetect the right resolution. By default the xorg.conf file just contained all the more normal monitor resolutions. I had to google for the correct modeline to use to get the required 1080p signal to the TV. I think I found it on the AVForums website if it helps.

Author:	manicmike [ Tue Jul 15, 2008 7:02 am ]
Post subject:
snaproll wrote: My solution was to get a (Nvidia) video card with DVI out and use a DVI to HDMI cable to the TV and this banished all problems.... That's if you don't count horrendous overscan as a problem. Yes, VGA is dark, but at least you can see all of your picture. I use DVI/HDMI grudgingly, due to the brightness factor. What do you want to sacrifice? Ideally, get a large computer monitor with DVI input. Cheers Mike

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knoppmyth via VGA cable to HDTV http://forum.linhes.org/viewtopic.php?f=15&t=18545	Page 1 of 1

Author:	Grant_Edwards [ Tue Jul 15, 2008 7:18 am ]
Post subject:
manicmike wrote: snaproll wrote: My solution was to get a (Nvidia) video card with DVI out and use a DVI to HDMI cable to the TV and this banished all problems.... That's if you don't count horrendous overscan as a problem. You've got a badly designed or configured TV. Most flat panel TVs have a "no overscan" mode where you can drive them with a signal at the panel's native resolution and get exact 1:1 pixel mapping. Quote: Yes, VGA is dark, but at least you can see all of your picture. I use DVI/HDMI grudgingly, due to the brightness factor. What do you want to sacrifice? Ideally, get a large computer monitor with DVI input. When I was shopping for TVs last year, Toshiba was the only brand I found that didn't have a no-overscan, 1:1 mode when driven with a DVI signal. It sounds like yours is similarly "broken".

Author:	snaproll [ Tue Jul 15, 2008 8:27 am ]
Post subject:
Grant_Edwards wrote: manicmike wrote: snaproll wrote: My solution was to get a (Nvidia) video card with DVI out and use a DVI to HDMI cable to the TV and this banished all problems.... That's if you don't count horrendous overscan as a problem. You've got a badly designed or configured TV. Most flat panel TVs have a "no overscan" mode where you can drive them with a signal at the panel's native resolution and get exact 1:1 pixel mapping. Quote: Yes, VGA is dark, but at least you can see all of your picture. I use DVI/HDMI grudgingly, due to the brightness factor. What do you want to sacrifice? Ideally, get a large computer monitor with DVI input. When I was shopping for TVs last year, Toshiba was the only brand I found that didn't have a no-overscan, 1:1 mode when driven with a DVI signal. It sounds like yours is similarly "broken". True. This is a YMMV problem. My experience is 'not a problem' because the Aquos is a 'dot by dot mode' TV and there is no overscan from DVI to HDMI.

Author:	ughpaul2 [ Tue Jul 15, 2008 11:43 am ]
Post subject:
so does anyone know if knoppmyth configures monitor settings each time it starts or only during installation?

Author:	BigMoneyJim [ Wed Jul 16, 2008 4:21 am ]
Post subject:
I have a KnoppMyth-based HDTV DVR that is connected to my Samsung DLP via VGA. (My onboard video doesn't have DVI or HDMI but works well enough.) Autodetect generally does not work with the TVs, so you'll probably have to tinker some. I had to tinker with settings in Xorg and the TV. My choices seem to be overscan (not getting the whole picture) or underscan (black box around the picture). ughpaul2 wrote: so does anyone know if knoppmyth configures monitor settings each time it starts or only during installation? The portion that runs the video is Xorg (like with many other linux distributions). Xorg is supposed to be more or less automatic and so probes your video card every time it starts, but you can change settings in /etc/X11/xorg.conf to cajole it into doing what you want. (Not for the beginner; don't toy with this file unless you've read about Xorg settings and understand what you're doing.)

Author:	manicmike [ Wed Jul 16, 2008 6:16 am ]
Post subject:
Grant_Edwards wrote: It sounds like yours is similarly "broken". Panasonic lxd600. No way to disable it.

Author:	Grant_Edwards [ Wed Jul 16, 2008 2:57 pm ]
Post subject:
manicmike wrote: Grant_Edwards wrote: It sounds like yours is similarly "broken". Panasonic lxd600. No way to disable it. That sucks. FWIW, the way to disable it is sometimes pretty obscure. On my LG, you can assign a "label" to each of the inputs (e.g. "DVD", "Satellite", "PC", "VCR", etc.). IIRC, overscan is disabled as a side-effect of picking the "PC" label for the input (I'm not even sure it works for all of them). The user manual doesn't mention that at all, but there was an app note or something on the LG web site that explained it. The odd thing I noticed when shopping for TVs was that the 1st tier brands (Sharp, Sony) all had well documented 1:1 modes, and so did the 3rd tier brands (Vizio, Olevia). It was the 2nd tier brands that either didn't have it or didn't document it.

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