determine the amout of video ram

[Rick Stevens]

Mark Lane wrote:
> On Thu, 2003-12-11 at 13:56, Yohann Desquerre wrote:
> 
>>Le jeu 11/12/2003 à 21:06, Mark Lane a écrit :
>>
>>>On Thu, 2003-12-11 at 13:04, Yohann Desquerre wrote:
>>>
>>>>Hi all,
>>>>
>>>>I had a i845GL video chipset ....and when i was MS i saw that there is
>>>>64Mo on it.
>>>
>>>Actually it shares system memory. You can set the amount in bios.
>>
>>I can't give 64Mo in the bios...Limit to 8Mo
> 
> 
> Then windows is out to lunch and you only have 8MBs

Yup.

>>>>Under FC1(Or other linux distro), i can't have 1152x864 as under MS.
>>>>
>>>>
>>>>So i wonder how many videoram the system use !!!
>>>
>>>This will have nothing to do with your videoram amount. It has to do
>>>with the mode lines for your video card and monitor. Do you have the
>>>correct monitor settings?
>>
>>yes i think !!!
>>
> 
> 
> I don't think so. This problem has nothing to do with the amount of
> video memory. Either the video driver doesn't support that resolution or
> your monitor settings are wrong.

Don't forget the color depth.  If you go to 8- or 16-bit color rather
than the 24-bit color, you cut your memory requirements by 33-66%.  You
can then get the 1152x864 size, but not as many colors.  Here is the
video RAM needed for an 1152x864 display:

	24-bit:	24MB
	16-bit:	15MB
	8-bit:	7.5MB

If all you can give is 8MB, you're limited to an 8-bit 1152x864 display
(256 colors).  The formula is:

     video RAM needed (in MB) = (width x height x number-of-bits)/1048576
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
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-      Always remember you're unique, just like everyone else.       -
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