determine the amout of video ram

Yohann Desquerre yohann.desquerre at wanadoo.fr
Thu Dec 11 22:01:10 UTC 2003


As you advise me i tried 8bits mode 1152x864 but no sucess. My display
setting block to 1024 x 768 but i am in 85Hz (I saw that with
"gnome-display-properties" under X) by default.

Maybe it would be better in 75hz but i don't know how to change this in
/etc/XF86Config file. 


Le jeu 11/12/2003 à 22:23, Rick Stevens a écrit :
> 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
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
> - VitalStream, Inc.                       http://www.vitalstream.com -
> -                                                                    -
> -      Always remember you're unique, just like everyone else.       -
> ----------------------------------------------------------------------
> 
> 
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