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Old 12-31-08, 11:54 AM   #1
lukescharf
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Default 2048x1152 with GeForce 7050 PV

Greetings!

I just picked up a Samsung SyncMaster 2343bwx 23" LCD panel at an after-Christmas sale. It's an oddball as LCD screens go, but it looks like it will match my needs and peeves better than most -- and it's a lot better than the 17" LCD it's replacing. It has a native-resolution of 2048x1152. I did a quick test with a MacBook to make sure that the panel works, and the MacBook appeared to be driving the panel at 2048x1152, and everything looked good.

However, when I attach it to my Ubuntu Hardy box, I only see a resolution of 1680x1050.

So here's my setup: an Ubuntu Hardy amd64 box with what lspci called an "VGA compatible controller: nVidia Corporation GeForce 7050 PV / nForce 630a (rev a2)". Both the nvidia drivers that are packaged with Hardy and also the latest driver that I downloaded from nVidia's website (NVIDIA-Linux-x86_64-177.82-pkg2.run) seem stuck at 1680x1050. The nvidia-settings app refuses to believe that 2048x1152 is a viable resolution. I've attempted to edit /etc/X11/xorg.conf and manually replace all references of 1680x1050 with the resolution I want. I've even made a halfhearted attempt to disable DDC in xorg.conf.

So, my questions are as follows:
  1. Has anyone else had this oddball resolution work under Linux? With Xfree86, I used to be able to just generate whatever modeline I wanted, but the newer (and much nicer in almost every case) dynamic configuration seems to be ignoring my suggestions.
  2. Can my video card drive 2048x1152 over a DVI-D link? It's an "nVidia Corporation GeForce 7050 PV / nForce 630a (rev a2)".
  3. Are there any "features" in the nVidia driver that would cause it to ignore oddball DDC information? I'm running the driver included in NVIDIA-Linux-x86_64-177.82-pkg2.run

Thanks!
-Luke
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Old 01-01-09, 05:12 PM   #2
lukescharf
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Default Re: 2048x1152 with GeForce 7050 PV

Just a quick note -- my /var/log/Xorg.[0-9].log shows the follwing line:
(--) NVIDIA(0): Samsung SyncMaster (DFP-0): 155.0 MHz maximum pixel clock

And the modeline calculator that I'm playing with suggests that the dot-clock needs to be around 211.75 mhz.

Maybe I'll try to lower the refresh rate - but it's already at 60hz, which is about as low as I'll go, even on an LCD.

Question: With a DVI-D graphics card and monitor, can both the card and the monitor limit the dot-clock? It seems reasonable that it should -- but I've never really looked at how DVI works, so I don't know what is "negotiable". :-)
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Old 01-01-09, 05:36 PM   #3
nvpro
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Default Re: 2048x1152 with GeForce 7050 PV

For resolutions this high, dual-link DVI is required, which is not supported by the nForce 630a / GeForce 7050. Either use VGA, get a mainboard with the more recent GeForce 8200 chipset or use a discrete graphics card.
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Old 01-02-09, 09:19 AM   #4
lukescharf
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Default Re: 2048x1152 with GeForce 7050 PV

Cool -- I'm looking at a GeForce 9800 GT based board as a replacement for my existing one. The information sheet says it supports resolutions up to 2048x1536 -- I guess that implicitly means that it supports Dual-Link DVI?

I took a seminar on CUDA recently, so I'd like one that supports at least CUDA 1.1. Does that GPU support at least CUDA 1.1? The Wikipedia article doesn't say which GPU supports which version.

Does the GeForce 9800 GT sound like a good match for my needs?
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Old 01-02-09, 10:23 AM   #5
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Default Re: 2048x1152 with GeForce 7050 PV

In general that max resolution refers to the analog output. It depends on what components the manufacturer used on the card whether it supports dual link.

Further 2048x1152 might just work on your current card if you use a modeline which uses reduced blanking. A high pixelclock like that 211.75 MHz is needed if it the monitor was a CRT monitor as for those you need to wait a short time before you can move to the next line or frame. A reduced blanking modeline has those blanking times reduced and for that reason can use a much lower pixel clock.
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Old 01-02-09, 10:23 AM   #6
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Default Re: 2048x1152 with GeForce 7050 PV

In general that max resolution refers to the analog output. It depends on what components the manufacturer used on the card whether it supports dual link.

Further 2048x1152 might just work on your current card if you use a modeline which uses reduced blanking. A high pixelclock like that 211.75 MHz is needed if it the monitor was a CRT monitor as for those you need to wait a short time before you can move to the next line or frame. A reduced blanking modeline has those blanking times reduced and for that reason can use a much lower pixel clock.
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Old 01-02-09, 02:45 PM   #7
DeeZiD
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Default Re: 2048x1152 with GeForce 7050 PV

I've bought this LCD, too.
It's just working fine so far.

Use the DVI cable from the package.
Switch on the LCD and start your PC.

atleast...
Thats what I did.

I had nothing else to do.

Ubuntu Intrepid
NVIDIA Beta 180.16
Geforce 9800GT


regards Dennis
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Old 01-02-09, 05:41 PM   #8
nvpro
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Default Re: 2048x1152 with GeForce 7050 PV

Almost all (or even all?) 8xxx or higher chipsets support dual-link DVI.
The CUDA programming guide contains information on which GPUs support what level. I'm curious, why do you need at least 1.1 support?

Is it a good match? I suppose it's too much. If until now the slow IGP was good enough for you, a slower but also more power efficient card might be a better choice.
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Old 01-03-09, 12:50 PM   #9
lukescharf
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Default Re: 2048x1152 with GeForce 7050 PV

Thanks for the report, DeeZid! The local big-box store had a deal on 9800 GTs, but they're sold out... I'll get one as soon as they're in back stock, or as soon as NewEgg matches the price.
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Old 01-03-09, 01:02 PM   #10
lukescharf
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Default Re: 2048x1152 with GeForce 7050 PV

nvpro,

Doh! I should have checked the programming guide. I was just doing quick Google and Wikipedia searchs. :-)

The technical reasons for wanting CUDA 1.1:
During the seminar I took, I heard that there were some slow-but-useful functions in CUDA 1.1 for gathering data and/or syncing the threads. Anything that I do in CUDA is likely to be original code, and that code doesn't need to be particularly portable to older hardware -- so I figure that there's no reason to hold back and just use a subset of what's available.

The political reasons for wanting CUDA 1.1:
There's a group at the university where I work that's doing some hard-core CUDA work. I talk to that crew in the coffee-room, and I'd like to be able to keep up with bit-twiddling conversations -- and maybe give them a hand every once in a while. They put on an "introduction to CUDA" seminar, which was a good start, but I really need to write my own code before I'm comfortable with the environment. Their test-bench is heavily used so I figure that, as long as I need to buy a video card anyway, getting one that would be a good development sandbox for myself would be a win!
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Old 01-12-09, 06:09 AM   #11
TheSVD
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Default Re: 2048x1152 with GeForce 7050 PV

lukescharf, Please, i really need to know this:
What kind of macbook do you have?
I need to know if the unibody macbooks will power this display with mini display port, as i have just ordered this monitor for my macbook pro.
Also, how does this display look when set to 1920x1080? - Deezid could also help with this.
A reply would be so fantastic, as i cant find any other forum in which someone else owns this monitor
Thankyou very much!
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Old 01-12-09, 03:21 PM   #12
DeeZiD
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Default Re: 2048x1152 with GeForce 7050 PV

Quote:
Originally Posted by TheSVD View Post
Also, how does this display look when set to 1920x1080? - Deezid could also help with this.
A reply would be so fantastic, as i cant find any other forum in which someone else owns this monitor
Thankyou very much!
It looks ok.
But not as good as if you let the videoplayer do the scaling


Dennis
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