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Old 04-09-06, 11:54 AM   #1
quasar0
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Join Date: Apr 2006
Posts: 3
Default DFP modes are limited to 60Hz refresh rate

I just updated to the new 8756 drivers and now nvidia for some reason limits DFP to 60Hz. Even though EDID says the refresh goes up to 85Hz. Does anyone know if there is a good reason for this?


(--) NVIDIA(0): Connected display device(s) on GeForce FX 5700 at PCI:1:0:0:
(--) NVIDIA(0): ViewSonic VX924 (DFP-0)
(--) NVIDIA(0): ViewSonic VX924 (DFP-0): 150 MHz maximum pixel clock
(--) NVIDIA(0): ViewSonic VX924 (DFP-0): Internal Single Link TMDS
(--) NVIDIA(0): ViewSonic VX924 (DFP-0): Native FlatPanel Scaling is
(--) NVIDIA(0): supported
(--) NVIDIA(0): ViewSonic VX924 (DFP-0): DFP modes are limited to 60Hz refresh
(--) NVIDIA(0): rate

(--) NVIDIA(0):
(--) NVIDIA(0): --- EDID for ViewSonic VX924 (DFP-0) ---
(--) NVIDIA(0): EDID Version : 1.3
(--) NVIDIA(0): Manufacturer : VSC
(--) NVIDIA(0): Monitor Name : ViewSonic VX924
(--) NVIDIA(0): Product ID : 3868
(--) NVIDIA(0): 32-bit Serial Number : 16843009
(--) NVIDIA(0): Serial Number String : PS3051900944
(--) NVIDIA(0): Manufacture Date : 2005, week 19
(--) NVIDIA(0): DPMS Capabilities : Active Off
(--) NVIDIA(0): Prefer first detailed timing : Yes
(--) NVIDIA(0): Supports GTF : No
(--) NVIDIA(0): Maximum Image Size : 380mm x 300mm
(--) NVIDIA(0): Valid HSync Range : 30kHz - 82kHz
(--) NVIDIA(0): Valid VRefresh Range : 50Hz - 85Hz
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Old 04-09-06, 01:23 PM   #2
netllama
NVIDIA Corporation
 
Join Date: Dec 2004
Posts: 8,763
Default Re: DFP modes are limited to 60Hz refresh rate

Please start X with the following command:
startx -- -logverbose 5

and then generate and post an nvidia-bug-report.log.

Thanks,
Lonni
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Old 04-09-06, 02:56 PM   #3
quasar0
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Default Re: DFP modes are limited to 60Hz refresh rate

bug report
Attached Files
File Type: zip nvidia-bug-report.log.zip (18.6 KB, 138 views)
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Old 04-09-06, 03:03 PM   #4
florin
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Location: Palo Alto, CA
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Default Re: DFP modes are limited to 60Hz refresh rate

http://www.nvnews.net/vbulletin/showthread.php?t=67972
__________________
Florin Andrei

http://florin.myip.org/
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Old 04-09-06, 03:39 PM   #5
netllama
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Join Date: Dec 2004
Posts: 8,763
Default Re: DFP modes are limited to 60Hz refresh rate

quasar0,
Thanks for the bug report. I do see 1280x1024@75Hz in the EDID for your display, however its not showing up in the validated mode pool.

A few things you can try are:
0) Add this line to the Monitor section of your xorg.conf:
VertRefresh 75.0
1) Add this option to the Device section
Option "ModeValidation" "AllowNon60HzDFPModes"
2) Replace "1280x1024" with "1280x1024_75" in your Mode list

If none of the above helps, please startx with the following command:
startx -- -logverbose 6

and post an updated bug report that includs the above changes.

Thanks,
Lonni
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Old 04-09-06, 06:55 PM   #6
quasar0
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Default Re: DFP modes are limited to 60Hz refresh rate

Quote:
Option "ModeValidation" "AllowNon60HzDFPModes"
That does the Trick. Thanks for the quick responce.

The readme says:
Quote:
"AllowNon60HzDFPModes": some lower quality TMDS encoders are only rated to drive DFPs at 60Hz; the driver will determine when only 60Hz DFP modes are allowed. This argument disables this stage of the mode validation pipeline.
Shouldn't a cheep TMDS encoder put limits on the Dot Clock Frequency, not the refresh rate?
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