Joseph Shraibman wrote:
> I recently had to install a new motherboard. The graphics worked fine
> with the old one (a via, but I'm not sure which one) but did not with the
> new one. Ubuntu refused to use the via driver and would only use the
> vesa driver at a max resolution of 800x600. I downloaded the openchrome
> drivers and installed them, and was able to start gdm with them. The
> problem is that at any resolution above 1280x800 I get horrible
> flickering (and at 1280x800 the bottom of my screen is getting cut off).
> My monitor is a SyncMaster 712n. I selected this from the
> graphical video configure tool, and this was put in my xorg.conf:
>
> Section "Monitor"
> Identifier "SyncMaster"
> Vendorname "Samsung"
> Modelname "Samsung SyncMaster 711N/712N"
> Horizsync 30-81
> Vertrefresh 56-85
> modeline "[EMAIL PROTECTED]" 25.2 640 656 752 800 480 490 492 525 -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 31.5 640 664 704 832 480 489 491 520 -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 31.5 640 656 720 840 480 481 484 500 -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 36.0 640 696 752 832 480 481 484 509 -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 36.0 800 824 896 1024 600 601 603 625 +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 50.0 800 856 976 1040 600 637 643 666 +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 49.5 800 816 896 1056 600 601 604 625 +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 56.3 800 832 896 1048 600 601 604 631 +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 40.0 800 840 968 1056 600 601 605 628 +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 57.284 832 864 928 1152 624 625 628 667
> -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 94.5 1024 1072 1168 1376 768 769 772 808
> +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 78.8 1024 1040 1136 1312 768 769 772 800
> +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 75.0 1024 1048 1184 1328 768 771 777 806
> -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 65.0 1024 1048 1184 1344 768 771 777 806
> -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 108.0 1152 1216 1344 1600 864 865 868 900
> +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 78.8 1024 1040 1136 1312 768 769 772 800
> +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 75.0 1024 1048 1184 1328 768 771 777 806
> -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 65.0 1024 1048 1184 1344 768 771 777 806
> -vsync
> -hsync
> modeline "[EMAIL PROTECTED]" 108.0 1152 1216 1344 1600 864 865 868 900
> +hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 135.0 1280 1296 1440 1688 1024 1025 1028
> 1066
> +hsync +vsync
> modeline "[EMAIL PROTECTED]" 102.1 1280 1360 1496 1712 960 961 964 994
> -hsync
> +vsync
> modeline "[EMAIL PROTECTED]" 108.0 1280 1328 1440 1688 1024 1025 1028
> 1066
> +hsync +vsync
> modeline "[EMAIL PROTECTED]" 129.86 1280 1368 1504 1728 960 961 964 1002
> -hsync +vsync
> modeline "[EMAIL PROTECTED]" 122.61 1400 1488 1640 1880 1050 1051 1054
> 1087
> -hsync +vsync
> modeline "[EMAIL PROTECTED]" 175.5 1600 1664 1856 2160 1200 1201 1204
> 1250
> +hsync +vsync
> modeline "[EMAIL PROTECTED]" 162.0 1600 1664 1856 2160 1200 1201 1204
> 1250
> +hsync +vsync
> Gamma 1.0
> EndSection
>
> I downloaded the manual from
> http://org.downloadcenter.samsung.com/downloadfile/ContentsFile.aspx?CDSite=us&CttFileID=167561&CDCttType=UM&ModelType=C&ModelName=712N&VPath=UM/200504/20050413231145750_BN59-00420J-04Eng.pdf
>
> (see page 60) but I'm not sure how I translate what is in there to my
> xorg.conf. I
> changed the Vertrefresh to 56-75 and commented out the modelines above
> @60 (since the manual says 60mhz is prefered ) but it still doesn't work.
>
> http://www.tupari.net/unichrome/2007-nov-28/xorg.conf.20011231190431 is
> the xorg.conf from my previous motherboard.
> http://www.tupari.net/unichrome/2007-nov-28/xorg.conf~ is the xorg.conf
> after the section for the SyncMaster 712n was added but before I changed
> it. xorg.conf in that directory is the current one I am using, and
> Xorg.0.log is the current xorg log using that as my config file.
>
Remove all the modelines and Horizsync Vertrefresh from the monitor
section, they are probably unneeded as the monitor is probably
advertising its modelines and hsync/vsync range thru DDC.
I would rewrite the monitor section like that :
Section "Monitor"
Identifier "SyncMaster"
Option "DPMS"
EndSection
Then just add the wanted resolutions to the screen section :
Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "SyncMaster"
Defaultdepth 24
SubSection "Display"
Depth 24
Modes "1600x1200" "1400x1050" "1280x1024"
EndSubSection
EndSection
grrr, and after going thru all the files and all, I actually read the
display manual. The optimal resolution is 1280x1024 so no wonder
anything else is blurry... The recommendation above still apply though,
but don't expect any miracle, TFT are made to work at only one
resolution, anything else is doomed to be sub-par.
Oh, and you'll have to generate modelines for all the modes that are not
advertised thru DDC (use the 'cvt' tool).
Xavier
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