Ubuntu 8.10 beta on Asus P5Q-VM board (G45 graphics) partial success, but some questions

[Neil]

On Wed, Oct 8, 2008 at 11:30 AM, Chris G <cl at isbd.net> wrote:
> Well I now have Ubuntu 8.10 beta stable on my new Asus P5Q-VM
> motherboard with the Intel G45 graphics.  The way to prevent X
> crashing the video was to add:-
>
>    Option "NoAccel"
>
> to the Device section of xorg.conf.  Since I'm not trying to do any
> whizzy graphics turning acceleration off doesn't worry me at the
> moment and no doubt the fixes will come along in due course.
>
> However I'm still stuck with a maximum resolution of 1152x864 and I
> want to go up to my 'normal' resolution of 1600x1200.
>
> How does X determine what resolutions to show in the Gnome Screen
> Resolution applet?  Presumably it does some sort of display detection.
>
> Currently I have my monitor plugged into the VGA (D-Sub) connector as
> I have my old desktop system on the DVI-D input of my monitor
> (that's where I'm typing this).  When I tried swapping over to using
> the DVI-D output of the G45 graphics on my new motherboard it failed
> to start X at all and switching to a console (CTRL-ALT-<number>) gave
> me a "mode not supported" on my monitor.  So it looks as if the
> display detection in the Intel/G45 drivers is a bit wonky!
>
> Is there any way to manually get at the results of the display
> detection - and then put them into the xorg.conf file?  I could then
> use the detection on my old system to get the right values and put
> them into the new system.
>
> --
> Chris Green
>
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> ubuntu-users at lists.ubuntu.com
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>

Hi there

This may help: http://www.linuxquestions.org/questions/linux-hardware-18/force-xorg-to-use-specific-monitor-resolution-disable-ddc-670874/
although it is about a Radeon card, and these things may vary across brands.

X uses ddc to detect what resolution is possible with the monitor (as
it should). Howecer this seems to fail in a lot of cases, and if you
add "option "NoDDC"" to the section about your graphics card it should
not use the detected (wrong) values.

Hope it helps

Neil

-- 
There are three kinds of people: Those who can count, and those who cannot count
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