I've got a laptop with an ATI Mobility 7500 display chipset running
Windows XP Professional.  This chipset lists a TON of strange
resolutions on the Display | Settings tab that I will never use and
scales them all to the display panel's native resolution (1400x1050). 
I want to restrict the available choices to just 800x600, 1024x768 and
1400x1050 -- the only resolutions I will actually use.  Registry hacks
are OK.

Hi there!

After some research, I have found that it is possible to do this but
only within the Windows Registry.
If you are not comfortable editing the registry then please ask
somebody else to do it for you, this information is used at your own
risk.

When you are ready, open the registry by going to Start > Run then
type "regedit" and press Enter.

The first thing we must do is back up the registry.
To do this, go to the File menu and select Export.
Make sure the radio button titled "All" is selected and then save the
file.
To undo any changes or mistakes, all you have to do is double click on
this file or select Import from the file menu within Regedit.

We will be using the following guide to help us:
http://www.rage3d.com/radeon/reg/index5.shtml

Go to the Edit menu, then select Find.
Type in "DALNonStandardModesBCD" and press Enter.
You can navigate straight to HKEY_LOCAL_MACHINE\Software\ATI
Technologies\Driver and look for the numbered folders with the DAL key
in if you wish.
When you find the key, double click on it and you should see something
that looks like this: http://www.rage3d.com/radeon/reg/index51.gif

The web page that we are referring to contains the quote:
"The data is formatted as follows

HH HH VV VV CC CC RR RR 

where
* HH HH represents horizontal resolution
* VV VV represents vertical resolution
* CC CC represents color depth
* RR RR represents refresh rate

for example, to enable 1920x1080@70Hz: DALNonStandardModesBCD 19 20 10
80 00 00 00 70. The value of 00 00 indicates a wild card. In this case
CC CC = 00 00 represents all color depths."

So, we want the following for 800x600, 1024x768 and
1400x1050:

08 00 06 00 00 00 00 00
10 24 07 68 00 00 00 00
14 00 10 50 00 00 00 00

Delete all of the other but make sure that you are currently using one
of these resolutions!

After doing this, close Regedit and restart the computer for the
changes to have an effect.


I hope this helps!
Kind regards,
errol-ga.


Related Google searches:

"radeon resolution registry"
://www.google.co.uk/search?q=radeon+resolution+registry

This got me very close.  The settings were in a different place and I
had to remove some ...LargeScreen... settings while blocking standard
resolutions.  The particular key you mentioned is for *adding*
non-standard modes.  But, I did get there, so thank you!  FYI, here's
the changes I actually wound up making:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{60FBF527-7EDF-4CEE-AF20-C093BCAD3C73}\0000]
"DALNonStandardModesBCD1"=hex:14,00,10,50,00,00,00,60
"DALRestrictedModesBCD1"=hex:11,52,08,64,00,00,00,00,12,80,09,60,00,00,00,00,\
  12,80,10,24,00,00,00,00,16,00,12,00,00,00,00,00,17,92,13,44,00,00,00,00,18,\
  00,14,40,00,00,00,00,19,20,10,80,00,00,00,00,19,20,12,00,00,00,00,00,19,20,\
  14,40,00,00,00,00,20,48,15,36,00,00,00,00
"DALLargeDesktopModesBCD"=hex:

Hi mr_zorg!

I'm a fellow researcher on the site.  I don't have any direct way of
getting in touch with you, other than hoping you'll read this message
after being alerted to it.

I just finished researching your question concerning tracking number
verifications.  I just realized you had expired the question an hour
ago, and so I have no way of answering your question now.  Are you
still in need of this information?  If so, you can open the question
again and put it to my attention in the subject line.  E.g., "For
jbf777-ga."

Thanks,

jbf777-ga
GA Researcher

Sorry about that, jbf777-ga.  I was beginning to think it wasn't
possible.  If you've got a concrete answer that meets my original
criteria, yes, by all means I'd still like the info.  See repost
under: http://answers.google.com/answers/main?cmd=threadview&id=207899

Mr_zorg -

No problem at all... glad you saw the message!  I'll be posting
something probably tonight or tomorrow.

jbf777