[NTLUG:Discuss] Grub Video Config Help

[David Stanaway]

Robert Pearson wrote:
> On 4/1/06, Stephen Davidson <gorky at freenet.carleton.ca> wrote:
>> Greetings.
>>
>> I am having an issue with GRUB, Linux booting, and LCD Monitors.  During
>> the boot (after the countdown finishes), the LCD monitor is flashing
>> "input not supported" at me, until XDM starts.  I was wondering how to
>> change the video mode during booting to something the LCD supports.
>> This would be especially useful for when the system fails to start
>> runlevel 5 and X, especially when something happens and it goes to
>> Single User mode.
>>
>> I was unable to find anything either in the info pages, man pages, or on
>> Google on how to do this.
I don't think it is an X problem, it sounds like X works fine, but its 
the console frambuffer which causes a problem.

What type of graphics card are you using?  You may like to append a 
kernel arg that changes the text mode for your console.

Do you see the grub boot menu or not?
When exactly is it that you loose the screen res?

1) BIOS init
2) Grub
3) Kernel boot
4) init scripts - eg: loading modules, or auto detecting hardware?



> 
> What Linux are you running? I assume you are running Xorg for X.
> 
> On SuSE 9.3 I get these symptoms when the "X" config file is correct
> but the YaST config for the monitor has the wrong frequencies. This
> has happened both with XFree86 and Xorg.
> If you have the manual for your monitor it should have a table of
> these frequencies. Use the frequencies for the recommended for
> the resolution you are using.
> 
> (1) Get the system up and running
> (2) Go direct to step (4) if you have the manual and frequencies
> (3) Open the xorg.conf file and find where the monitor frequencies are
>    (a) On my SuSE 10.0 system the xorg.conf file is in /etc/X11.
>    (b) The monitor part looks like---
> Section "Monitor"
>   DisplaySize  340 270
>   HorizSync    30-78
>   Identifier   "Monitor[0]"
>   ModelName    "MRT_MVPII L7CH_TA"
>   Option       "DPMS"
>   VendorName   "GVT"
>   VertRefresh  43-75
>   UseModes     "Modes[0]"
> EndSection
> 
> Only
> "HorizSync    30-78"
> "VertRefresh  43-75"
> are of real interest.
> 
> (4) Open YaST / Hardware / Graphics Card and Monitor and check that
> the Horizontal and Vertical frequencies are the same or within the range
> of the xorg.conf ones.
> 
> Be aware YaST (using input from SaX) will write a new xorg.conf file
> after you make your changes. Sometimes you have to repeat the
> process until SaX and YaST agree. These means the monitor will work
> during "non-X" processes but not after "X" starts. Just the reverse of
> what you have now.
> 
> Robert...
> 
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