Re: need help with xorg.conf
On Fri, 12 Mar 2010 23:09:27 -0500 (EST), Tony Nelson wrote:
> On 10-03-12 13:11:14, Stephen Powell wrote:
>> On Fri, 12 Mar 2010 10:58:08 -0500 (EST), Paul E Condon wrote:
>>> ...
>>> (--) SAVAGE(0): probed videoram: 32768k
>>
>> Plenty of video RAM to do true color mode even at 1366x768
>> resolution.
>>
>> 1366x768x24/1024 = 24588k; 1366x768x32/1024 = 32784k.
>> Hmm. If we have to use 32 bits of RAM per pixel, we may not have
>> enough. We'll see about that later.
>> ...
>
> You did the math wrong. Use bytes, not bits. Also allow for 3
> buffers.
>
> (1366*768*3*3)/1024 = 9220K
> (1366*768*4*3)/1024 = 12294K
I did indeed do the math incorrectly! What a schoolboy mistake!
I neglected to convert from bits to bytes. But I don't understand
your version either. The correct math, by the way I have traditionally
done it, is
1366*768*3/1024 = 3073.5k
1366*768*4/1024 = 4098k
This is based on a formula obtained from "Upgrading and Repairing
PCs", Sixth Edition, by Scott Mueller, page 443. (This book is
quite dated, having been copyrighted in 1996.)
Where did you get the stuff about three buffers? Does this have
something to do with 3D graphics acceleration?
--
.''`. Stephen Powell <zlinuxman@wowway.com>
: :' :
`. `'`
`-
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