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   /  Amiga OS4 Hardware
      /  SAM Users ! Also bad qualitiy on VGA LCD ?
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gerograph 
SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 11:52:45
#1 ]
Cult Member
Joined: 5-Dec-2007
Posts: 901
From: Moers - Germany

Hi everybody,

just a question to all SAM users. I connected my SAM to 19" LCD via the enclosed dvi-VGA Adaptor. The video qualitiy, even with very short cables is very bad.
It worked way better with my A1200/Bvision OS4 Classic. Of course I just speek about the physical resolution of the LCD.

Any idea how to improve the qualitiy (without buying a DVI LCD) ?

Last edited by gerograph on 28-Dec-2008 at 11:55 AM.

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ZeroG 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 12:28:22
#2 ]
Cult Member
Joined: 16-Jul-2004
Posts: 544
From: Germany

@gerograph

Yes, the same here, but my monitor has DVI.

You could try if you get a better signal from the onboard VGA (J25) if you can get a cable, but dont expect too much.

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m3x 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 12:41:03
#3 ]
Regular Member
Joined: 15-May-2003
Posts: 311
From: Bologna, Italy

@gerograph

Use the internal VGA header, the signal quality is much better than the DVI-VGA one.
If you need further info about the internal VGA pinout, contact ACube directly.

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NutsAboutAmiga 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 12:57:19
#4 ]
Elite Member
Joined: 9-Jun-2004
Posts: 12931
From: Norway

@gerograph

"dvi to VGA" and "VGA to dvi" adaptors suck!

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nubechecorre 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 13:04:44
#5 ]
Cult Member
Joined: 21-Nov-2003
Posts: 895
From: San remo -Italy-

@M3X

The output quality is due only to the adapter right ? there are no problems with direct DVI connection or VGA connection ?

BTW here i have a good quality with the adapter

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Yaroze 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 13:10:05
#6 ]
Member
Joined: 13-Oct-2008
Posts: 79
From: Sweden

Crystal clear picture with DVI to my 22" 1680x1050 Display. :)

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Tomas 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 13:52:46
#7 ]
Elite Member
Joined: 25-Jul-2003
Posts: 4286
From: Unknown

@gerograph

Quote:

gerograph wrote:
Hi everybody,

just a question to all SAM users. I connected my SAM to 19" LCD via the enclosed dvi-VGA Adaptor. The video qualitiy, even with very short cables is very bad.
It worked way better with my A1200/Bvision OS4 Classic. Of course I just speek about the physical resolution of the LCD.

Any idea how to improve the qualitiy (without buying a DVI LCD) ?

Are you using the correct resolution for your monitor?

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Swoop 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 14:20:05
#8 ]
Elite Member
Joined: 20-Jun-2003
Posts: 2163
From: Long Riston, East Yorkshire

@gerograph

Have you checked the tooltypes on your graphics driver?
Are they set up correctly for your monitor?

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A1XEG3-800 [IBM 750FX PowerPC], running OS4.1FE, using ac97 onboard sound.

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ChrisH 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 17:57:50
#9 ]
Elite Member
Joined: 30-Jan-2005
Posts: 6679
From: Unknown

Yes, DVI looks really good here. I briefly tried the supplied DVI-VGA adapter, and the picture was 'terrible' (although I have not tested VGA input of my monitor with anything else, so it could be my monitor or cables).

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whatelse 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 18:12:37
#10 ]
Member
Joined: 23-Oct-2008
Posts: 12
From: Germany

@gerograph
no problems here with the vga-dvi adapter

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ZeroG 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 18:37:09
#11 ]
Cult Member
Joined: 16-Jul-2004
Posts: 544
From: Germany

@whatelse

With something like 800x600 it looks OK, but with 1920x1200 its really bad here.

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Ande 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 19:53:51
#12 ]
Regular Member
Joined: 16-Oct-2008
Posts: 172
From: Finland

No problems with a dvi adapter here either.

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A1200/030
A2000/030
A500 * 3

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Tomas 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 20:03:22
#13 ]
Elite Member
Joined: 25-Jul-2003
Posts: 4286
From: Unknown

@ZeroG

Quote:

ZeroG wrote:
@whatelse

With something like 800x600 it looks OK, but with 1920x1200 its really bad here.

What kind of monitor are you using? Is the native resolution actually 1920x1200? LCD's often turn blurry if you feed it anything besides the native resolution. This has nothing to do with graphics card, OS or computer if that is the case.

Last edited by Tomas on 28-Dec-2008 at 08:04 PM.

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gerograph 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 20:47:37
#14 ]
Cult Member
Joined: 5-Dec-2007
Posts: 901
From: Moers - Germany

@Tomas @all

I am using the native resolution from my LCD of course (1280x1024). I called that "physical resolution". Sorry I am from Germany so might have been the wrong vokabulary further up in this thread...
My monitor worked brilliant with the same resolution under BVision and Windows.
I also checked Tooltypes and editided the max and min values according to values given in Monitors documentation.

Seems like people with VGA Adaptor have different results. DID ACUBE DELIVER DIFFERENT DVI-VGA Adaptors ???



Last edited by gerograph on 28-Dec-2008 at 08:58 PM.

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Everblue 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 22:44:36
#15 ]
Cult Member
Joined: 24-Sep-2006
Posts: 678
From: Amigaland

I have a Sam440 preordered - my monitor is VGA only and I do not plan to buy a new TFT with DVI any soon. So I am really scared to get this problem.

If this happens, can I solve the problem by fitting a PCI Video card in the slot which has VGA out? If yes, which video card would work?

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nbache 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 28-Dec-2008 23:27:26
#16 ]
Super Member
Joined: 8-Apr-2003
Posts: 1034
From: Copenhagen, Denmark

@Everblue

Quote:

Everblue wrote:
I have a Sam440 preordered - my monitor is VGA only and I do not plan to buy a new TFT with DVI any soon. So I am really scared to get this problem.

If this happens, can I solve the problem by fitting a PCI Video card in the slot which has VGA out? If yes, which video card would work?

Why waste money and effort (and your only PCI slot) on another VGA output, just do what Max suggested further up this thread and use the internal VGA header directly.

Best regards,

Niels

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stedy 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 29-Dec-2008 0:58:01
#17 ]
Member
Joined: 26-Aug-2005
Posts: 35
From: London, England

@gerograph

Can you define bad quality?

Do you get noise lines running across the screen?
Are there shadows of text?
Are the pixels blurred?
Are the colours wrong?
Is the screen mis-aligned horizontally or vertically?

@thread

Those DVI-VGA adaptors are dumb. They contain no active components, they just route signals. They provide Analogue RGB, Hsync, Vsync , DDC and ground.

The DVI-Analogue connection is the same video signal as that on a VGA port. In the Nvidia and ATI reference designs I have seen, the RGB Video DAC that is used to drive the VGA port can also be used as the Analogue DVI output.

A lack of RGB ground could cause issues with video but the C5 connection of the DVI connector provides this.

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Everblue 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 29-Dec-2008 7:31:55
#18 ]
Cult Member
Joined: 24-Sep-2006
Posts: 678
From: Amigaland

@nbache

I would have no idea what sort of connector I would use to do that. Also, wouldnt that require that the VGA cable goes INSIDE the case? Or I'm mistaken?

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ZeroG 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 29-Dec-2008 9:27:47
#19 ]
Cult Member
Joined: 16-Jul-2004
Posts: 544
From: Germany

@Tomas
Quote:

Is the native resolution actually 1920x1200?

Yes.
But i dont have a problem with that, i only noticed the bad signal quality because U-Boot for SAM does not yet support DVI-D. So i have used VGA to update/setup U-Boot and to install OS4.1. Now its connected to my monitor with a DVI-D cabel.

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Everblue 
Re: SAM Users ! Also bad qualitiy on VGA LCD ?
Posted on 29-Dec-2008 10:18:33
#20 ]
Cult Member
Joined: 24-Sep-2006
Posts: 678
From: Amigaland

@ZeroG

So on UBoot signal is bad, but once you install OS4.1, then picture is ok?

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