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-   -   hdmi or dvi to connect to monitor (http://www.linuxquestions.org/questions/linux-laptop-and-netbook-25/hdmi-or-dvi-to-connect-to-monitor-4175416691/)

oakhilltop 07-14-2012 10:31 AM

hdmi or dvi to connect to monitor
 
This is not linux specific, but I thought this forum would be a great resource.

I'm looking at laptops, and the new laptop may get connected to an external monitor in the future. Most laptops have hdmi, some also have dvi and some still have vga. I know hdmi is good for connecting to TVs and monitors to watch videos etc, but does it work well as a the connection for general computer use? Or should I look for a laptop with dvi? From most laptop specs, it's difficult to figure out what resolutions are supported for external monitors. The hdmi is usuall specified at 1080p or 720, but often the dvi just says dvi.

273 07-14-2012 11:28 AM

Not sure how much use this is but my old EEEPC 1000 can output to a 1920*1200 monitor from its VGA socket.
I'd guess that VGA is still supported by most projectors and monitors you'd use in a work situation, and DVI is probabl supported similarly.
If you want to hook up to friends' TVs then HDMI is likely to be the best to go for.
Bear in mind you can get DVI to HDMI and DVI to VGA adaptors so DVI with cheap adaptors will work with almost anything.

oakhilltop 07-14-2012 12:00 PM

One laptop I was looking at, is an Acer Aspire. It only has HDMI for an output. No dvi or vga.

That's what made me wonder if HDMI can be used to connect to a monitor for general use.

This is for my son who's going to college. I'm not going to get a monitor to begin with, but would like to have that option for the future.

273 07-14-2012 12:05 PM

I'm afraid I don't know whether HDMI to DVI adaptors exist -- if they do then there's no problem, if not I'd go for DVI as being most adaptable (sorry for the bad pun).

oakhilltop 07-14-2012 12:26 PM

Puns are good. :-)

I haven't decided on a laptop. I just like to understand the features before I buy. I don't have a laptop with hdmi to try and see how it works. I also need a new laptop soon.

It seemed odd that this Acer only has HDMI, and then I realized I wasn't sure if HDMI is good for use with a computer monitor.

jefro 07-14-2012 12:33 PM

HDMI is DVI with sound.

Adapters are like $4.

273 07-14-2012 12:39 PM

I'm googling for HDMI to VGA adaptors now and whilst I see some I'm not seeing any simple adaptors of the nature of DVI to VGA or HDMI. Am I missing something jefro?

oakhilltop 07-14-2012 03:41 PM

Quote:

Originally Posted by 273 (Post 4728058)
I'm googling for HDMI to VGA adaptors now and whilst I see some I'm not seeing any simple adaptors of the nature of DVI to VGA or HDMI. Am I missing something jefro?

I found some at the link below. Not $4 but not too much either. I haven't searched further.

Sounds like an external monitor can be used with a laptop with just hdmi out for video.

http://www.hdtvsupply.com/hdtodvico.html

lithos 07-14-2012 03:51 PM

Hi,

I can say I have my LED monitor connected to my PC via HDMI with normal 1920x1080 display resolution and picture is far better than VGA (although DVI-> HDMI is the same, but I don't like to use the adapter DVI/HDMI ). I bought a monitor which had HDMI/DVI/VGA connectors so I used it.

jefro 07-14-2012 06:05 PM

Kind of a lot going on here. Connections are not a display size ever. To make it worse a TV and a computer are not the same type of signal. Either the computer or tv has to support the other.

To make things worse while hdmi may be dvi, dvi comes in various formats.

It can be quite a trick sometimes to get your computer and tv to work together. I have had two htpc systems that would drive me crazy after a video driver update.

TobiSGD 07-14-2012 07:07 PM

Quote:

Originally Posted by 273 (Post 4728058)
I'm googling for HDMI to VGA adaptors now and whilst I see some I'm not seeing any simple adaptors of the nature of DVI to VGA or HDMI. Am I missing something jefro?

Yes, you are. The video signal of HDMI compatible with the digital video signal of DVI. Unlike DVI-I, HDMI does not have the analog video signals, so you need a converter to get an analog signal. A simple adapter, like DVI<->HDMI or DVI-I<->VGA can't handle that.

273 07-15-2012 03:23 PM

Quote:

Originally Posted by TobiSGD (Post 4728234)
Yes, you are. The video signal of HDMI compatible with the digital video signal of DVI. Unlike DVI-I, HDMI does not have the analog video signals, so you need a converter to get an analog signal. A simple adapter, like DVI<->HDMI or DVI-I<->VGA can't handle that.

Then I'm not missing something. That was my point -- that you can get a simple $4 adaptor to convert DVI to VGA or HDMI but not one to convert HDMI to VGA, so DVI is the better choice if you want to connect to multiple unknown devices.

TobiSGD 07-15-2012 03:39 PM

Quote:

Originally Posted by 273 (Post 4728875)
Then I'm not missing something. That was my point -- that you can get a simple $4 adaptor to convert DVI to VGA or HDMI but not one to convert HDMI to VGA, so DVI is the better choice if you want to connect to multiple unknown devices.

Only if you have a DVI-I port, if it is DVI-D then it doesn't matter at all. DVI-I has VGA signals integrated, DVI-D doesn't.

273 07-15-2012 03:44 PM

Quote:

Originally Posted by TobiSGD (Post 4728887)
Only if you have a DVI-I port, if it is DVI-D then it doesn't matter at all. DVI-I has VGA signals integrated, DVI-D doesn't.

Ah, OK, that bit I did miss. So sounds like DVI-I is the one to go for if you can find it.

jefro 07-15-2012 04:32 PM

Almost all hdmi systems actually have two audio devices. One device is the onboard or add on audio card. The second is part of the hdmi. If you were to take the hdmi video only, that would mean you'd need to set the built in/add on audio as the output and route it to the tv or speaker system.


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