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Anyone using a Displayport to VGA adapter?

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  Anyone using a Displayport to VGA adapter? rhkramer@gmail.com - 2021-01-13 19:00 +0100
    Re: Anyone using a Displayport to VGA adapter? Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-13 19:30 +0100
    Re: Anyone using a Displayport to VGA adapter? David Christensen <dpchrist@holgerdanske.com> - 2021-01-13 23:20 +0100
      Re: Anyone using a Displayport to VGA adapter? Felix Miata <mrmazda@earthlink.net> - 2021-01-13 23:50 +0100
        Re: Anyone using a Displayport to VGA adapter? David Christensen <dpchrist@holgerdanske.com> - 2021-01-14 00:40 +0100
          Re: Anyone using a Displayport to VGA adapter? Felix Miata <mrmazda@earthlink.net> - 2021-01-14 01:40 +0100
    Re: Anyone using a Displayport to VGA adapter? Michael Stone <mstone@debian.org> - 2021-01-13 23:40 +0100
      Re: Anyone using a Displayport to VGA adapter? rhkramer@gmail.com - 2021-01-14 00:30 +0100
        Re: Anyone using a Displayport to VGA adapter? Michael Stone <mstone@debian.org> - 2021-01-14 01:00 +0100
        Re: Anyone using a Displayport to VGA adapter? Dan Ritter <dsr@randomstring.org> - 2021-01-14 01:40 +0100
          Re: Anyone using a Displayport to VGA adapter? rhkramer@gmail.com - 2021-01-15 15:00 +0100
            Re: Anyone using a Displayport to VGA adapter? Stefan Monnier <monnier@iro.umontreal.ca> - 2021-01-16 03:20 +0100

#230617 — Anyone using a Displayport to VGA adapter?

Is anyone on here using a Displayport to VGA adapter?  If so:

   * How's it working?
   * Does it handle at least 1920x1080 resolution?

If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to VGA 
adapter, do you have an opinion as to which does better?

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#230618

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rhkramer@gmail.com writes:

> Is anyone on here using a Displayport to VGA adapter?  If so:
>
>    * How's it working?

I have been using a DP (GPU) to VGA (screen) adapter for years with various  
screens and graphics cards. It works out of the box no issues whatsoever.

>    * Does it handle at least 1920x1080 resolution?

Honestly, I do not know. I know that it can run at 1920x1080 but the image  
has been (slightly) distorted. HOWEVER, that is most likely not the  
adapter's fault but rather the KVM switche's, because other PCs GPUs that  
are attached directly to VGA also show this distortion.

I also remember that VGA image quality can actually depend on the GPU and  
cable quality: I do not always get a sharp image with laptops directly  
attached to 1920x1080 monitors through VGA...

> If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to VGA
> adapter, do you have an opinion as to which does better?

Note that modern USB-C type adapters could be DP adapters in disguise  
because some USB-C connectors also offer DP signals upon request.

HTH
Linux-Fan

öö

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#230628

On 2021-01-13 09:50, rhkramer@gmail.com wrote:
> Is anyone on here using a Displayport to VGA adapter?  

I have two Star Tech DP2VGA2.


> If so:
> 
>     * How's it working?

I have not experienced any issues with them.


>     * Does it handle at least 1920x1080 resolution?

Yes.; that is the maximum resolution for this model.


> If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to VGA
> adapter, do you have an opinion as to which does better?

I might consider "officially supported" NVIDIA, ATI, etc., chips and/or 
USB, Thunderbolt, etc., cables for Windows or macOS.  But for Linux and 
FreeBSD, I have had the best luck over the past 20+ years with Intel 
integrated graphics and VGA, DVI-I, DVI-D, HDMI, and/or DP connectors on 
the motherboard/ laptop.


David

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#230631

David Christensen composed on 2021-01-13 14:15 (UTC-0800):

> rhkramer wrote:

>>     * Does it handle at least 1920x1080 resolution?

> Yes.; that is the maximum resolution for this model.

I'll bet on double check you would find the limit is 1920x1200. I've never found
any situation where a GPU or adapter or cable that supports 1920x1080 would not
also support 1920x1200 (assuming the display does too). :)

DP to VGA I've never done, but I have done just about every other combination
possible before USB-C or 3840x2160 existed.
-- 
Evolution as taught in public schools, like religion,
	is based on faith, not on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#230638

On 2021-01-13 14:40, Felix Miata wrote:
> David Christensen composed on 2021-01-13 14:15 (UTC-0800):
> 
>> rhkramer wrote:
> 
>>>      * Does it handle at least 1920x1080 resolution?
> 
>> Yes.; that is the maximum resolution for this model.
> 
> I'll bet on double check you would find the limit is 1920x1200.


It looks like you win the bet -- I looked up old Amazon orders and 
stopped at the product title:

https://www.amazon.com/StarTech-com-DisplayPort-VGA-Adapter-Converter/dp/B003V4TV8O

StarTech.com DisplayPort To VGA Video Adapter Converter - Active - 1080p 
- DP to VGA Converter (DP2VGA2)


Reading further, the description says "With support for video 
resolutions up to 1920x1200 or 1080p".  The StarTech page confirms it:

https://www.startech.com/en-us/audio-video-products/dp2vga2


The DP2VGA3 has "1920x1200" in the title on both Amazon and StarTech. 
The specifications appear to be the same as the DP2VGA2 (?), but the 
price is less:

https://www.amazon.com/StarTech-com-DP2VGA3-DisplayPort-Adapter-Converter/dp/B00JQJV4OC

https://www.startech.com/en-us/audio-video-products/dp2vga3


Here are the Wikipedia pages on VGA, 1080p, and 1920x1200:

https://en.wikipedia.org/wiki/Video_Graphics_Array

https://en.wikipedia.org/wiki/1080p

https://en.wikipedia.org/wiki/1920x1200


I am unable to determine the maximum resolution, refresh rate, 
bandwidth, etc., for VGA.  My monitor and KVM are VGA 1920x1080, so I 
run that or less.


David

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#230652

David Christensen composed on 2021-01-13 15:39 (UTC-0800):

> I am unable to determine the maximum resolution, refresh rate, 
> bandwidth, etc., for VGA.  My monitor and KVM are VGA 1920x1080, so I 
> run that or less.

Before acquiring any flat panels, I had 18" & larger CRTs running 2048x1536 on VGA
with GPUs that had enough RAM.
-- 
Evolution as taught in public schools, like religion,
	is based on faith, not on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#230630

On Wed, Jan 13, 2021 at 12:50:38PM -0500, rhkramer@gmail.com wrote:
>Is anyone on here using a Displayport to VGA adapter?  If so:
>
>   * How's it working?
>   * Does it handle at least 1920x1080 resolution?
>
>If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to VGA
>adapter, do you have an opinion as to which does better?

What is the use case for this?

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#230636

On Wednesday, January 13, 2021 05:36:13 PM Michael Stone wrote:
> On Wed, Jan 13, 2021 at 12:50:38PM -0500, rhkramer@gmail.com wrote:
> >Is anyone on here using a Displayport to VGA adapter?  If so:
> >   * How's it working?
> >   * Does it handle at least 1920x1080 resolution?
> >
> >If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to
> >VGA adapter, do you have an opinion as to which does better?
> 
> What is the use case for this?

After failing to find a laptop to meet my needs, I'm now looking for a mini-PC 
to almost meet my needs.  It has to be small due to space constraints, e.g., 
something like 7x7x2 and it needs to have a VGA output because I'm going to 
run it through my existing VGA KVM switch.

Several of the ones I've found that look promising do not have a VGA port but, 
in many cases only one (or two) DisplayPort(s).

(Some more on the mini-PC: I want an AMD processor, with at least two cores, 
and at least something like 2.2 GHz., space for 16 GB RAM, although I might 
start with 8, Ethernet port, audio output.  The mouse and keyboard connection 
from the KVM is USB, but I do have USB to PS2 converters if I need them.  
Generic on-board graphics is fine, I don't play games.  The main use will be to 
run Buster to run the version of G++ so I have access to C++17 to develop a 
lexer for Scintilla.  I may eventually migrate from my Wheezy system to this 
as my daily driver.)

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#230641

On Wed, Jan 13, 2021 at 06:27:15PM -0500, rhkramer@gmail.com wrote:
>On Wednesday, January 13, 2021 05:36:13 PM Michael Stone wrote:
>> On Wed, Jan 13, 2021 at 12:50:38PM -0500, rhkramer@gmail.com wrote:
>> >Is anyone on here using a Displayport to VGA adapter?  If so:
>> >   * How's it working?
>> >   * Does it handle at least 1920x1080 resolution?
>> >
>> >If anybody has used both a Displayport to VGA adapter ands a USB-3.1 to
>> >VGA adapter, do you have an opinion as to which does better?
>>
>> What is the use case for this?
>
>After failing to find a laptop to meet my needs, I'm now looking for a mini-PC
>to almost meet my needs.  It has to be small due to space constraints, e.g.,
>something like 7x7x2 and it needs to have a VGA output because I'm going to
>run it through my existing VGA KVM switch.
>
>Several of the ones I've found that look promising do not have a VGA port but,
>in many cases only one (or two) DisplayPort(s).

Ok, just trying to make sure I'm properly understanding the 
directionality and such. I'd basically consider what you're looking for 
to be a commodity. They're going to have a zillion different names on 
the outside, and only a couple of different chips on the inside. Pick 
one from amazon or whatever, and if it doesn't work send it back and 
pick a different one. (The other way, VGA output to digital input, is 
less common and seems to have more variation.)

FWIW, I'd do anything, including running multiple video cables around 
the KVM, to avoid doing a lot of work on an analog input again--it's 
never as crisp as digital.

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#230653

rhkramer@gmail.com wrote: 
> After failing to find a laptop to meet my needs, I'm now looking for a mini-PC 
> to almost meet my needs.  It has to be small due to space constraints, e.g., 
> something like 7x7x2 and it needs to have a VGA output because I'm going to 
> run it through my existing VGA KVM switch.
> 
> Several of the ones I've found that look promising do not have a VGA port but, 
> in many cases only one (or two) DisplayPort(s).
> 
> (Some more on the mini-PC: I want an AMD processor, with at least two cores, 
> and at least something like 2.2 GHz., space for 16 GB RAM, although I might 
> start with 8, Ethernet port, audio output.  The mouse and keyboard connection 
> from the KVM is USB, but I do have USB to PS2 converters if I need them.  
> Generic on-board graphics is fine, I don't play games.  The main use will be to 
> run Buster to run the version of G++ so I have access to C++17 to develop a 
> lexer for Scintilla.  I may eventually migrate from my Wheezy system to this 
> as my daily driver.)

My wife's "desktop" is an ASRock DeskMini A300W -- a box of
about that size, in which I placed a 3400G, 32GB RAM and an NVMe
SSD. She drives a 4K monitor from the HDMI port. Debian Buster.

It has a VGA port.

The new version is the X300W, which costs about $30 more, takes
a newer revision of AMD APU, and still has a VGA port available.

My two criticisms: it's a bit of a pain to put together the
first time if you have giant fingers, which I do. It would be
nice to have more USB ports, though this can be solved with a
USB3 hub.

-dsr-

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#230697

On Wednesday, January 13, 2021 07:33:14 PM Dan Ritter wrote:
> My wife's "desktop" is an ASRock DeskMini A300W -- a box of
> about that size, in which I placed a 3400G, 32GB RAM and an NVMe
> SSD. She drives a 4K monitor from the HDMI port. Debian Buster.
> 
> It has a VGA port.
> 
> The new version is the X300W, which costs about $30 more, takes
> a newer revision of AMD APU, and still has a VGA port available.
> 
> My two criticisms: it's a bit of a pain to put together the
> first time if you have giant fingers, which I do. It would be
> nice to have more USB ports, though this can be solved with a
> USB3 hub.

Dan (and all),

Thanks again for the pointer, but I'll add a 3rd criticism and a "workaround":

Aside: I am still looking, and am considering some of the ASRocks and also 
some Lenovo (and maybe other) refurbished models. 

Aside: I usually don't buy (or even consider) things like refurbished disk 
drives (what do they do, repolish the disk surfaces? ;-) (I'm being 
facetious)) or devices like laptops that include disk drives -- partly because 
of what I read once about adding memory and replacing the disk drive in a 
recent HP laptop (in the old days, it was easy) -- early in the instructions 
it talked about the need to remove something like 56 screws -- but after 
(later) reading a little more , it really depended on how much you wanted to 
replace.

On a mini-PC I'm confident about my ability to replace a disk drive without too 
much trouble.

The criticism: The ASRock web pages (well, almost all of them), with the dark 
images on a black background were just about impossible for me to see / read 
(I got a headache).  (Even my "trick" of selecting / highlighting the page 
wasn't much help.)  (Well, the page for one model, I forget which, was 
readable with a white background.)

And no prices. (I realized later that might make some sense as apparently they 
don't sell direct, but still, it would be helpful to see an MSRP ;-)

The workaround: Eventually I found that Newegg was an "e-tailer" for ASRock, 
so I went to the Newegg site and am looking at the offerings there.  (I don't 
think they sell all models (I didn't notice any of the "Bee"s, iirc.)  But the 
pages are readable and they do show prices.

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#230704

> Aside: I usually don't buy (or even consider) things like refurbished disk
> drives (what do they do, repolish the disk surfaces? ;-) (I'm being
> facetious)) or devices like laptops that include disk drives -- partly because
> of what I read once about adding memory and replacing the disk drive in a
> recent HP laptop (in the old days, it was easy) -- early in the instructions
> it talked about the need to remove something like 56 screws -- but after
> (later) reading a little more , it really depended on how much you wanted to
> replace.

I strongly recommend buying refurbished laptops, as long as they're
good/reliable laptops: not only you save a lot of money, but also it
gives you slightly-older laptops which makes sure Debian has had time to
work out-of-the box in it, and on top of it all, you help reduce the
enormous ecological impact of our crazy consumption of electronic
gadgets (e.g. the production of a laptop consumes more energy than
what the laptop will ever consume during its whole lifetime).

On all the thinkpads I know, the 2½ drive can be swapped by removing
a single screw (tho admittedly, this single screw lets you remove the
drive + "caddy" and if you want to change the drive, you then needs to
remove the 4 screws that attach the drive to the "caddy").

I suspect similar things apply to many other brands.

> On a mini-PC I'm confident about my ability to replace a disk drive
> without too much trouble.

I'd expect you also need to handle 4-5 screws to remove a drive from a mini-PC.


        Stefan

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