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Old 08-11-05, 02:25 PM   #1
cswingle
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Default Dot clock maximum too low for 1920x1200 Cinema Display

Greetings!

I've got an AMD64 desktop Linux machine with a GeForce FX 5200, X.org 6.8.2, the 7676 nVidia driver, and a 23" Apple Cinema display. Kernel 2.6.12.2.

Using the X.org 'nv' driver, I can see the modeline the display wants to use:

(II) NV(0): clock: 154.0 MHz Image Size: 495 x 310 mm
(II) NV(0): h_active: 1920 h_sync: 1968 h_sync_end 2000 h_blank_end 2080 h_border: 0
(II) NV(0): v_active: 1200 v_sync: 1203 v_sync_end 1209 v_blanking: 1235 v_border: 0

The 'nv' driver also shows the 'Clock range' as 12.00 to 350.00.

The problem is that the 'nvidia' driver says the upper limit on the dot clock is 135.00, which means the Modeline I added for the 1920x1200 display doesn't work. The 'nvidia' driver kicks me down to 1400x1050, which needless to say, looks awful.

I've done a bunch of Google searches, trying to find other Modelines that have a dot clock value under 135, but none of them work. With earlier versions of the 'nvidia' driver, I was able to get 1600x1200, which still looks bad, but it's better than 1400x1050.

Help! It sure would be nice to be able to drive the display at it's native resolution!

Thanks,

Chris
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Old 08-11-05, 02:58 PM   #2
uOpt
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

Hmm, works on my 5900XT with this modeline:
Modeline "1920x1200dell2" 161.75 1920 2020 2052 2184 1200 1202 1208 1235 -hsync -vsync

If I remember it I can try the PCI 5200 I have in the same box.
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Old 08-11-05, 03:17 PM   #3
cswingle
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

Martin,

Interesting. I guess you're not seeing '(--) NVIDIA(0): DFP-0: maximum pixel clock: 135 MHz' in your /var/log/Xorg.0.log for that particular video card, since you're using a dot clock of 162.

If I knew for a fact that I could get the monitor to work with a different, specific, video card, I'd go out and buy it today! You've got a 23" Apple Cinema display? Is it the brushed metal version, or the acrylic one?

Thanks,

Chris
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Old 08-11-05, 03:38 PM   #4
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

No, I have a Dell 2405FPW but it is the same resolution.

I cannot tell the pixel clock of the DVI of my 5200 right now, the box is at home and it is configured with TV and CRT. CRT says max clock is 400 MHz. The DVI on my 5900XT says 165 MHz max.

If you are unlucky then your 5200 has the same crappy DVI as the GeForce 4 has which wouldn't do more than 1600x1200. I thought all the FX 5xx0 had the full DVI interface, though.
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Old 11-10-05, 08:29 PM   #5
hjort
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Question Re: Dot clock maximum too low for 1920x1200 Cinema Display

Same problem here a FX5200 and a Dell 2405FPW. The Xlog claims a maximum pixel clock of 135MHz, though the screen wants a 154MHz clock (which is within the DVI spec of 165MHz). Also the screen seems to be picky about what modes it accepts.
Is this (135MHz) a limit of the driver? Or sub standard hardware?

Any recomendations for a fan-less card that does have full DVI support?

(II) NVIDIA(0): NVIDIA GPU detected as: GeForce FX 5200
(--) NVIDIA(0): VideoBIOS: 04.34.20.27.00
(--) NVIDIA(0): Interlaced video modes are supported on this GPU
(II) NVIDIA(0): Detected AGP rate: 4X
(--) NVIDIA(0): VideoRAM: 131072 kBytes
(II) NVIDIA(0): Using ConnectedMonitor string "CRT-0, DFP-0"
(--) NVIDIA(0): CRT-0: maximum pixel clock: 350 MHz
(--) NVIDIA(0): DFP-0: maximum pixel clock: 135 MHz
(WW) NVIDIA(0): Failure reading FlatPanel flags for DFP-0.

Not sure what
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Old 11-11-05, 07:57 PM   #6
dulley
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

Here is the modeline you need for Apple Cinema HD Display 23"
Modeline "1920x1200" 154.0 1920 1968 2000 2080 1200 1203 1209 1235 +Hsync -Vsync

This modeline is for the display's native resolution.
the values were taken from the EDID by running "startx -- -logverbose 5"

I hope it helps!

cheers!
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GeForce FX Go5200 64 MB
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Old 11-11-05, 09:15 PM   #7
hjort
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

Thanks, but unfortunatly it does not help me nor the original poster.

The first number after the name ("1920x1200") is the pixel clock. The modeline given here it is 154.0. The GeForce FX 5200 according to the 7676 divers, at least, states "maximum pixel clock: 135 MHz". So, no go.

The really question then is the stated maximum fo 135MHz becasue of poor HW or a software limit that can be worked around?

And if it is a HW limit, then why and how can I avoid purchasing a substandard gfx card the next time around.

Regards
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Old 11-12-05, 01:45 AM   #8
cjcox
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

I don't think you can do 1920x1200 with a 135Mhz dotclock. Even if possible, refresh rate would have to be very low IMHO.
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Old 11-12-05, 06:29 AM   #9
hjort
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

I've not been having any luck getting it to work with the Dell 2405FPW at least.
One can create a 50-52Hz modeline for 1920x1200 that stays under 135MHz, it was rejected becasue 'vrefresh out of range'.

First one is 50Hz, second is 52Hz
Modeline "1920x1200" 135.00 1920 1952 2080 2112 1200 1228 1232 1261
Modeline "1920x1200" 135.00 1920 1952 2000 2032 1200 1225 1235 1261

(II) NVIDIA(0): Monitor name: DELL 2405FPW
(II) NVIDIA(0): Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 81 kHz, PixClock max 170 MHz
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Old 11-21-05, 04:55 AM   #10
tvujec
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

I have the same problem on my Dell Latitude D800 Laptop. Funilly enough the maximum dot clock is read correctly with 1.0-7174 (350 MHz), but all subsequent releases state 135MHz. You might want to downgrade to 7174 until NVIDIA fixes the problem with the driver.
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Old 11-21-05, 03:51 PM   #11
netllama
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

If you're seeing a different pixelclock with different driver versions then that is a bug, and not a bug that is known, or known to be resolved.

Please generate a bug report against each driver version (where it works, and where it fails), and post the bug report here for review.

Thanks,
Lonni
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Old 12-15-05, 02:27 AM   #12
krott
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Default Re: Dot clock maximum too low for 1920x1200 Cinema Display

Quote:
Originally Posted by tvujec
I have the same problem on my Dell Latitude D800 Laptop. Funilly enough the maximum dot clock is read correctly with 1.0-7174 (350 MHz), but all subsequent releases state 135MHz. You might want to downgrade to 7174 until NVIDIA fixes the problem with the driver.
Same here on FX 5200, shows 135 MHz instead of 400 MHz as it was in 1.0-7174.
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