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using unusal modes (eg. 1400x1050) with intel VGA chipsets
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faTe|sonix
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Joined: 05 Apr 2003
Posts: 8
Location: Germering

PostPosted: Fri Jun 03, 2005 10:41 am    Post subject: using unusal modes (eg. 1400x1050) with intel VGA chipsets Reply with quote

I had a probem with my new notebook. Its native resolution is 1400x1050 but the i810 xorg driver did not accept this reslution and took the next lesser one (1280x1024). As you can imagine it looked awfull. Mosly unreadable :(

So I did some research about this problem. The reason why the xorg driver does not accept the resolution of 1400x1050 is because the videobios doesn't report this resolution as supported. The only way to get it working is to change this information. I found a tool on the web which can do this trick.

As thesnowman mentions below, there is an ebuild available here.

If you don't want to download single files, i've packed them together and changed the version from 0.3 to 0.4. You can find this package here

Now, download, extract and emerge it ( i think you know how to do this ;))

After this it's very simple. Execute this command:

Code:
855resolution -l


and you get something like this

Code:

855resolution version 0.4, by Alain Poirier

Chipset: 855GM (id=0x35808086)
VBIOS type: 2
VBIOS Version: 3104

Mode 30 : 640x480, 8 bits/pixel
Mode 32 : 800x600, 8 bits/pixel
Mode 34 : 1024x768, 8 bits/pixel
Mode 38 : 1280x1024, 8 bits/pixel
Mode 3a : 1600x1200, 8 bits/pixel
Mode 3c : 1920x1440, 8 bits/pixel
Mode 41 : 640x480, 16 bits/pixel
Mode 43 : 800x600, 16 bits/pixel
Mode 45 : 1024x768, 16 bits/pixel
Mode 49 : 1280x1024, 16 bits/pixel
Mode 4b : 1600x1200, 16 bits/pixel
Mode 4d : 1920x1440, 16 bits/pixel
Mode 50 : 640x480, 32 bits/pixel
Mode 52 : 800x600, 32 bits/pixel
Mode 54 : 1024x768, 32 bits/pixel
Mode 58 : 1280x1024, 32 bits/pixel
Mode 5a : 1600x1200, 32 bits/pixel
Mode 5c : 1920x1440, 32 bits/pixel


Now you have to choose a resolution to replace, in my case i chose "Mode 3c : 1920x1440, 8 bits/pixel" cause i don't need it (the mode will be changed for 8/16/32 bits/pixel).
Ok now do the following:

Code:
855resolution 3c 1400 1050


this will replace 1920x1440 with 1400x1050, don't be afraid, this comand doesn't change anything permanent. The changes are gone with the next reboot. You can check if it worked with another

Code:
855resolution -l


which now will print something like this:

Code:

855resolution version 0.4, by Alain Poirier

Chipset: 855GM (id=0x35808086)
VBIOS type: 2
VBIOS Version: 3104

Mode 30 : 640x480, 8 bits/pixel
Mode 32 : 800x600, 8 bits/pixel
Mode 34 : 1024x768, 8 bits/pixel
Mode 38 : 1280x1024, 8 bits/pixel
Mode 3a : 1600x1200, 8 bits/pixel
Mode 3c : 1400x1050, 8 bits/pixel
Mode 41 : 640x480, 16 bits/pixel
Mode 43 : 800x600, 16 bits/pixel
Mode 45 : 1024x768, 16 bits/pixel
Mode 49 : 1280x1024, 16 bits/pixel
Mode 4b : 1600x1200, 16 bits/pixel
Mode 4d : 1400x1050, 16 bits/pixel
Mode 50 : 640x480, 32 bits/pixel
Mode 52 : 800x600, 32 bits/pixel
Mode 54 : 1024x768, 32 bits/pixel
Mode 58 : 1280x1024, 32 bits/pixel
Mode 5a : 1600x1200, 32 bits/pixel
Mode 5c : 1400x1050, 32 bits/pixel


Ok, nowedit your xorg.conf to support this resolution:

Code:

       Section "Screen"
         Identifier  "Screen 1"
         Device      "device"
         Monitor     "LCD"
         DefaultDepth 24

         Subsection "Display"
           Depth       24
           Modes       "1400x1050"
         EndSubsection
       EndSection


If you restart your X session the new resolution should be displayed. If all works right you can configure your system to set this resolution in your videobios at boottime.

Edit /etc/confd/855resolution and enter the options for 855resolution:

Code:

replace[0]="3c"
with[0]="1400 1050"


And finally add the rc-script to the default runlevel:

Code:

rc-update add 855resolution default


I hope this works for you.
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Last edited by faTe|sonix on Fri Jun 03, 2005 1:44 pm; edited 1 time in total
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thesnowman
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Posts: 365
Location: Sydney, Australia

PostPosted: Fri Jun 03, 2005 12:18 pm    Post subject: Reply with quote

ebuild that will probably end up in the portage tree available here.
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faTe|sonix
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Joined: 05 Apr 2003
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Location: Germering

PostPosted: Fri Jun 03, 2005 1:46 pm    Post subject: Reply with quote

thx for the info! I've changed my posting to use this one.

thx
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