Cant get 1280x1024 @ 75Hz to work

labba · 12-07-05, 05:44 AM

Hi!
I try to get a 1280x1024@75Hz resolution to work on my 19" TFT connected via DVI to my GeForce FX5900. The problem is, that my monitor says it can't do 1280x1024@75Hz but only 1280x1024@60Hz. Under Windows XP I simply added a custom mode an forced the driver to override the default modes and everything is ok now, the info OSD shows 75Hz.
But on my gentoo system I cant do this. I've added the following to my xorg.conf

Code:

Option     "IgnoreEDID"  "true"
Option     "UseEdidFreqs"  "false"

The modeline I use:

Code:

ModeLine  "1280x1024/75Hz" 135.60 1280 1320 1456 1696 1024 1028 1032 1066

When I launch X with these settings I get the following output in /var/log/Xorg.0.log:

Code:

(**) NVIDIA(0): Validated modes for display device DFP-0:
(**) NVIDIA(0):      Mode "1280x1024/75Hz": 135.6 MHz, 80.0 kHz, 75.0 Hz
(**) NVIDIA(0):      Default mode "1280x1024": 135.0 MHz, 80.0 kHz, 75.0 Hz
(**) NVIDIA(0):      Default mode "1280x1024": 108.0 MHz, 64.0 kHz, 60.0 Hz
(**) NVIDIA(0):      Default mode "1280x960": 108.0 MHz, 60.0 kHz, 60.0 Hz
(**) NVIDIA(0):      Default mode "1152x864": 108.0 MHz, 67.5 kHz, 75.0 Hz
(**) NVIDIA(0):      Default mode "1024x768": 78.8 MHz, 60.1 kHz, 75.1 Hz
(**) NVIDIA(0):      Default mode "1024x768": 75.0 MHz, 56.5 kHz, 70.1 Hz
(**) NVIDIA(0):      Default mode "1024x768": 65.0 MHz, 48.4 kHz, 60.0 Hz
(**) NVIDIA(0):      Default mode "832x624": 57.3 MHz, 49.7 kHz, 74.6 Hz
(**) NVIDIA(0):      Default mode "800x600": 49.5 MHz, 46.9 kHz, 75.0 Hz
(**) NVIDIA(0):      Default mode "800x600": 50.0 MHz, 48.1 kHz, 72.2 Hz
(**) NVIDIA(0):      Default mode "800x600": 87.8 MHz, 81.2 kHz, 65.0 Hz (D)
(**) NVIDIA(0):      Default mode "800x600": 40.0 MHz, 37.9 kHz, 60.3 Hz
(**) NVIDIA(0):      Default mode "800x600": 81.0 MHz, 75.0 kHz, 60.0 Hz (D)
(**) NVIDIA(0):      Default mode "700x525": 77.9 MHz, 81.5 kHz, 74.8 Hz (D)
(**) NVIDIA(0):      Default mode "700x525": 61.0 MHz, 64.9 kHz, 60.0 Hz (D)
(**) NVIDIA(0):      Default mode "640x512": 67.5 MHz, 80.0 kHz, 75.0 Hz (D)
(**) NVIDIA(0):      Default mode "640x512": 54.0 MHz, 64.0 kHz, 60.0 Hz (D)
(**) NVIDIA(0):      Default mode "640x480": 31.5 MHz, 37.5 kHz, 75.0 Hz
(**) NVIDIA(0):      Default mode "640x480": 31.5 MHz, 37.9 kHz, 72.8 Hz
(**) NVIDIA(0):      Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(**) NVIDIA(0):      Default mode "640x480": 54.0 MHz, 60.0 kHz, 60.0 Hz (D)
(**) NVIDIA(0):      Default mode "576x432": 54.0 MHz, 67.5 kHz, 75.0 Hz (D)
(**) NVIDIA(0):      Default mode "512x384": 39.4 MHz, 60.1 kHz, 75.1 Hz (D)
(**) NVIDIA(0):      Default mode "512x384": 37.5 MHz, 56.5 kHz, 70.1 Hz (D)
(**) NVIDIA(0):      Default mode "512x384": 32.5 MHz, 48.4 kHz, 60.0 Hz (D)
(**) NVIDIA(0):      Default mode "416x312": 28.6 MHz, 49.7 kHz, 74.7 Hz (D)
(**) NVIDIA(0):      Default mode "400x300": 24.8 MHz, 46.9 kHz, 75.1 Hz (D)
(**) NVIDIA(0):      Default mode "400x300": 25.0 MHz, 48.1 kHz, 72.2 Hz (D)
(**) NVIDIA(0):      Default mode "400x300": 20.0 MHz, 37.9 kHz, 60.3 Hz (D)
(**) NVIDIA(0):      Default mode "320x240": 15.8 MHz, 37.5 kHz, 75.0 Hz (D)
(**) NVIDIA(0):      Default mode "320x240": 15.8 MHz, 37.9 kHz, 72.8 Hz (D)
(**) NVIDIA(0):      Default mode "320x240": 12.6 MHz, 31.5 kHz, 60.1 Hz (D)
(II) NVIDIA(0): Setting mode "1280x1024/75Hz"

According to this output, everything should be OK, shouldn't it? But when I go into the TFTs OSD it shows 64kHz/60Hz 1280x1024...

Where ist the problem?
I've attached my xorg.conf. I'm using 8174 but had the same problem with previous releases.

Telomerase · 12-07-05, 09:09 AM

yup same problem here. description @ http://www.nvnews.net/vbulletin/show...92&postcount=7

refer to:
http://hannah.karatebob.com/~pvp/xorg.conf & http://hannah.karatebob.com/~pvp/Xorg.0.log

NOTE: the display is rated at 75Hz vertical refresh by the manufacturer and EDID says it's capable... no problem under Windows... as labba stated

netllama · 12-07-05, 02:07 PM

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

and then generate and post a bug report.

Also, did this problem exist with 1.0-7676?

Thanks,
Lonni

Telomerase · 12-07-05, 02:08 PM

yes it existed with 7676

labba · 12-08-05, 11:06 AM

Hi Lonni,
yes, this problem was also present with 7676.

nvidia-bugreport is attached...

Edit: attached another version with enabled edid information

Telomerase · 12-08-05, 11:41 AM

@labba, i'm not netllama but, i'd assume he'd want to see the output of startx -- -logverbose 5 while EDID probing was left enabled (just an assumption.)

netllama · 12-08-05, 01:29 PM

labba,
Why are you using the ConnectedMonitor and IgnoreDisplayDevices options?

According to the EDID in your bug report, your display can't do 75Hz at 1280x1024:
######
(--) NVIDIA(0): 1280 x 1024 @ 60Hz
(--) NVIDIA(0): Pixel Clock : 108.00 MHz
(--) NVIDIA(0): HRes, HSyncStart : 1280, 1328
(--) NVIDIA(0): HSyncEnd, HTotal : 1440, 1688
(--) NVIDIA(0): VRes, VSyncStart : 1024, 1025
(--) NVIDIA(0): VSyncEnd, VTotal : 1028, 1066
#######

And is failing here:
(II) NVIDIA(0): Not using mode "1280x1024_75.00" (hsync out of range)

I suppose you could try tweaking the HorizSync range in your xorg.conf, but based on the EDID, your display cannot do 75Hz@1280x1024.

Does the User's Manual for the display state that it can? If so, can you point me to it online?

Thanks,
Lonni

labba · 12-08-05, 01:51 PM

Quote:

Why are you using the ConnectedMonitor and IgnoreDisplayDevices options?

To be honest: I don't really know :-) Should I remove these Options?

The Display does support 1280x1024@75Hz but officially only if it is connected via the analogue VGA connector. But I know it can handle this mode when connected via DVI, too, because with windows XP it's just enough to insert a custom mode into the driver and the display runs fine with 75Hz. This should be possilbe with the linux driver, too, shouldn't it?

netllama · 12-08-05, 02:28 PM

Unless you have a reason for using those X options, then I don't see a point. Do you get better/different/worse results without them?

Based on your last bug report, your HorizSync range was the reason why the mode failed. As I suggested earlier, you can try tweaking the range (broadening it is likely the easiest way for now) and see if that helps. You can also try adding the IgnoreEDID X option.

However, if 1280x1024@75Hz isn't officially supported, then the Linux driver is doing the right thing, and I'd argue the Windows driver has a bug. You could end up damaging your display (or at the least, shortening its lifespan) by forcing it into a refresh rate that is outside of its documented abilities.

Thanks,
Lonni

Telomerase · 12-08-05, 03:48 PM

@netllama my only concern with having a vertical refresh at 75hz is due to my lack of understanding of LCD response times. would the vertical refresh affect a monitor's (specifically and limited to LCDs) response time in ms?

netllama · 12-08-05, 03:54 PM

I don't believe that the response time has any connection to the refresh rate.

-Lonni

Telomerase · 12-08-05, 05:23 PM

are you going to trust the EDID information and discontinue your investigation of the supposed problem?

12-07-05, 09:09 AM	#2
Telomerase Join Date: Dec 2005 Posts: 138	Re: Cant get 1280x1024 @ 75Hz to work yup same problem here. description @ http://www.nvnews.net/vbulletin/show...92&postcount=7 refer to: http://hannah.karatebob.com/~pvp/xorg.conf & http://hannah.karatebob.com/~pvp/Xorg.0.log NOTE: the display is rated at 75Hz vertical refresh by the manufacturer and EDID says it's capable... no problem under Windows... as labba stated __________________ Telomerase Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand. Telomerase: * is a ribonucleoprotein; * Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG. * Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action. * Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

12-07-05, 02:07 PM	#3
netllama NVIDIA Corporation Join Date: Dec 2004 Posts: 8,763	Re: Cant get 1280x1024 @ 75Hz to work Please start X with the following command: startx -- -logverbose 5 and then generate and post a bug report. Also, did this problem exist with 1.0-7676? Thanks, Lonni

12-07-05, 02:08 PM	#4
Telomerase Join Date: Dec 2005 Posts: 138	Re: Cant get 1280x1024 @ 75Hz to work yes it existed with 7676 __________________ Telomerase Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand. Telomerase: * is a ribonucleoprotein; * Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG. * Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action. * Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

12-08-05, 11:41 AM	#6
Telomerase Join Date: Dec 2005 Posts: 138	Re: Cant get 1280x1024 @ 75Hz to work @labba, i'm not netllama but, i'd assume he'd want to see the output of startx -- -logverbose 5 while EDID probing was left enabled (just an assumption.) __________________ Telomerase Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand. Telomerase: * is a ribonucleoprotein; * Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG. * Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action. * Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

12-08-05, 01:29 PM	#7
netllama NVIDIA Corporation Join Date: Dec 2004 Posts: 8,763	Re: Cant get 1280x1024 @ 75Hz to work labba, Why are you using the ConnectedMonitor and IgnoreDisplayDevices options? According to the EDID in your bug report, your display can't do 75Hz at 1280x1024: ###### (--) NVIDIA(0): 1280 x 1024 @ 60Hz (--) NVIDIA(0): Pixel Clock : 108.00 MHz (--) NVIDIA(0): HRes, HSyncStart : 1280, 1328 (--) NVIDIA(0): HSyncEnd, HTotal : 1440, 1688 (--) NVIDIA(0): VRes, VSyncStart : 1024, 1025 (--) NVIDIA(0): VSyncEnd, VTotal : 1028, 1066 ####### And is failing here: (II) NVIDIA(0): Not using mode "1280x1024_75.00" (hsync out of range) I suppose you could try tweaking the HorizSync range in your xorg.conf, but based on the EDID, your display cannot do 75Hz@1280x1024. Does the User's Manual for the display state that it can? If so, can you point me to it online? Thanks, Lonni

12-08-05, 02:28 PM	#9
netllama NVIDIA Corporation Join Date: Dec 2004 Posts: 8,763	Re: Cant get 1280x1024 @ 75Hz to work Unless you have a reason for using those X options, then I don't see a point. Do you get better/different/worse results without them? Based on your last bug report, your HorizSync range was the reason why the mode failed. As I suggested earlier, you can try tweaking the range (broadening it is likely the easiest way for now) and see if that helps. You can also try adding the IgnoreEDID X option. However, if 1280x1024@75Hz isn't officially supported, then the Linux driver is doing the right thing, and I'd argue the Windows driver has a bug. You could end up damaging your display (or at the least, shortening its lifespan) by forcing it into a refresh rate that is outside of its documented abilities. Thanks, Lonni

12-08-05, 03:48 PM	#10
Telomerase Join Date: Dec 2005 Posts: 138	Re: Cant get 1280x1024 @ 75Hz to work @netllama my only concern with having a vertical refresh at 75hz is due to my lack of understanding of LCD response times. would the vertical refresh affect a monitor's (specifically and limited to LCDs) response time in ms? __________________ Telomerase Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand. Telomerase: * is a ribonucleoprotein; * Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG. * Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action. * Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

12-08-05, 03:54 PM	#11
netllama NVIDIA Corporation Join Date: Dec 2004 Posts: 8,763	Re: Cant get 1280x1024 @ 75Hz to work I don't believe that the response time has any connection to the refresh rate. -Lonni

12-08-05, 05:23 PM	#12
Telomerase Join Date: Dec 2005 Posts: 138	Re: Cant get 1280x1024 @ 75Hz to work are you going to trust the EDID information and discontinue your investigation of the supposed problem? __________________ Telomerase Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand. Telomerase: * is a ribonucleoprotein; * Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG. * Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action. * Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

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