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diaSalvatore

Member

Registered: 2012-01-31

Posts: 11

[SOLVED] Correct Screen Resolution not available (vga cable problem?)

Hi guys,

I don't know if this is the right subforum, anyway I have a strange problem with my VGA cable.

This is my configuration:

GPU: nvidia gtx 550ti
Driver Video: nouveau/nvidia 304
Monitor: 19", 1680x1050

if i use a short vga cable, everything is ok, and i can use my monitor at correct resolution (1680x1050).
I bought a longer vga cable (12m), and with this, something is wrong, because with both driver the maximum resolution I can reach is 640x480 .
The monitor is not correctly identified (in fact it is recognized as "unknow"), but this happens only in linux, because with windows everything is ok.
Both cable are used with the same DVI-VGA adapter on one side.

I tried to manually add the correct resolution with:

cvt 1680 1050
xrandr --addmode <modeline>
...
(etc., as written in the wiki)

but when i try to set the new modeline, I get:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  150 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  33
  Current serial number in output stream:  34

Any advice for me?

Last edited by diaSalvatore (2014-01-04 19:05:06)

Gusar

Member

Registered: 2009-08-25

Posts: 3,605

Re: [SOLVED] Correct Screen Resolution not available (vga cable problem?)

When you're connected with the short cable that works, dump the EDID - there's a button somewhere in nvidia-settings to do it. Then tell the nvidia driver to use this EDID file - check the nvidia documentation, I don't know off the top of my head how exactly to do this. There's a similar trick for nouveau I think, but there I know even less how to achieve it.

Do you absolutely have to use VGA? A digital connection would be less sensitive to this issue.

diaSalvatore

Member

Registered: 2012-01-31

Posts: 11

Re: [SOLVED] Correct Screen Resolution not available (vga cable problem?)

When you're connected with the short cable that works, dump the EDID - there's a button somewhere in nvidia-settings to do it. Then tell the nvidia driver to use this EDID file - check the nvidia documentation, I don't know off the top of my head how exactly to do this. There's a similar trick for nouveau I think, but there I know even less how to achieve it.

Do you absolutely have to use VGA? A digital connection would be less sensitive to this issue.

Yeah, you can do it directly with nvidia-settings utility.
It fixed my problem. Thank you!

I have to use a VGA cable because it is the only port available on my monitor

Last edited by diaSalvatore (2014-01-04 20:40:30)

ilkyest

Member

From: Brazil

Registered: 2010-02-13

Posts: 269

Re: [SOLVED] Correct Screen Resolution not available (vga cable problem?)

Option "IgnoreEDIDChecksum" "DVI-I-0"