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Old 05-08-08, 02:46 PM   #13
marcus.kall
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Default Re: HDTV underscan in 1920x1080

Quote:
Originally Posted by pe1chl
Now you can ask Nvidia to "fix the bug" that is assumption is, or to provide a manual method of overriding the native resolution with a user-determined value (a config option in xorg.conf).
Or you can ask the manufacturer of the monitor to fix the problem.

Finally, you can capture the EDID, save it in a file, swap the first two modes, and provide the file as an EDID override. That works.
I think I should ask nvidia to fix the bug. Where do I do that?

I have been thinking of modifying the edid and provide the it as a file. Problem is, as fast as I switch to my other monitor, things will go really wrong. I will try it anyway, onyone who knows a good description of EDID data?
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Old 05-08-08, 02:49 PM   #14
marcus.kall
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Default Re: HDTV underscan in 1920x1080

Quote:
Originally Posted by pe1chl
There is also the invalid assumption in the driver that a mode with a resolution higher than the "native resolution" must not be used.
This is invalid because you may want to use a 1920x1080 mode on a 1366x768 screen and have the monitor do the downscaling.
This is not possible now because the driver rejects the 1920x1080 mode.
I can use resolutions higher than the native resolution. The 1920x1080 works good, except for the underscan problem.
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Old 05-09-08, 04:02 AM   #15
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Cool Re: HDTV underscan in 1920x1080

Quote:
Originally Posted by pe1chl
It is actually a bug in the monitor's EDID combined with an assumption in the Nvidia driver that the VESA recommends against.
The driver makes the assumption that the first listed mode in the EDID is the native resolution of the display. But this is not really true; it is the "recommended mode" for the monitor, which may be different from the native resolution. In your monitor, it is.
There is also the invalid assumption in the driver that a mode with a resolution higher than the "native resolution" must not be used.
This is invalid because you may want to use a 1920x1080 mode on a 1366x768 screen and have the monitor do the downscaling.
This is not possible now because the driver rejects the 1920x1080 mode.

Now you can ask Nvidia to "fix the bug" that is assumption is, or to provide a manual method of overriding the native resolution with a user-determined value (a config option in xorg.conf).
Or you can ask the manufacturer of the monitor to fix the problem.

Finally, you can capture the EDID, save it in a file, swap the first two modes, and provide the file as an EDID override. That works.
I forgot to tell you that my operating system is Debian Etch...

Pelchi, How do i use your solution to my overscan problem? I'm using a Samsung LN-S4092D 46in LCD Monitor TV...Who's native reso is 720p yet can go to 1080i resolution.

Any suggestions as to how i can eliminate this problem?
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Old 05-09-08, 04:56 AM   #16
pe1chl
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Default Re: HDTV underscan in 1920x1080

As I wrote before: The issue of underscan/overscan has absolutely nothing to do with the issue of misdetecting the native resolution of the display!
What I wrote about the EDID has nothing to do with overscan, it has to do with this:
(WW) NVIDIA(0): compute backend DFP timings (mode is larger than
(WW) NVIDIA(0): native backend 1280 x 720).
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Old 05-09-08, 11:47 AM   #17
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Cool Re: HDTV underscan in 1920x1080

Pe1chi, How do i capture or altered the EDID as you suggested before?

Finally, you can capture the EDID, save it in a file, swap the first two modes, and provide the file as an EDID override. That works. How do i do this Pelchi?
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Old 05-09-08, 01:02 PM   #18
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Default Re: HDTV underscan in 1920x1080

nvidia-settings can export EDID settings.
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Old 05-09-08, 01:13 PM   #19
pe1chl
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Default Re: HDTV underscan in 1920x1080

I have no detailed instructions to follow. It was explained before by someone else on the forum but I cannot find that thread now.
Besides, you are talking about an overscan problem and this solution is not going to solve that. It is to solve problems using highres modes on a lower-res display, or to work around quirks in the display EDID.
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