topic Re: backing-store in Operating System - Tru64 Unix

backing-store

Kim_9 — Mon, 11 Jul 2005 22:25:23 GMT

Hi,
How can I set backing-store to YES?
I use tru64 unix 5.1a.

Thanks.

Re: backing-store

Michael Schulte zur Sur — Tue, 12 Jul 2005 00:21:18 GMT

Hi,

can you explain what you need it for?
There are some references to that concerning graphics or programming.

greetings,

Michael

Re: backing-store

Kim_9 — Tue, 12 Jul 2005 21:27:07 GMT

I need to set always for my applications.
Thanks

Re: backing-store

Han Pilmeyer — Wed, 13 Jul 2005 04:44:13 GMT

Assuming you need it for X11, it is typically enabled by default. Which X server are you using?

If you run the xdpyinfo command, it will display whether backing store is enabled, e.g.:

# xdpyinfo | grep -i backing
options: backing-store YES, save-unders YES

Re: backing-store

Rick Retterer — Wed, 13 Jul 2005 07:12:37 GMT

** Note, there are some limitations to backingstore and saveunders... I believe that they aren't always guaranteed.***

BackingStore is enabled by default on certain graphics cards. You can only disable BackingStore and SaveUnders based on the command-line switches that are passed into the startup of the Xserver.

(see Manpages for Xdec)

On Tru64 Unix v5.1b, to explicitly turn off bs and su, you would want to edit the file /var/X11/Xserver.conf.

Down at the bottom of the file you will find a "stanza" that begins with:

! you specify command line arguments here
args <
-pn
>
!

and change it to look like this:

! you specify command line arguments here
args <
-pn -su -bs
>
!

Then restart Xdec using /sbin/init.d/xlogin.

However, if your graphics card has SU and BS disabled by default, you may be able to change it (enable it) by changing the color depth from 24 bits to 8 bits per pixel.

This is how it is done on a Radeon Graphics Card:

! you specify command line arguments here
args <
! Start Graphics Radeon required svr args.
-depth0 8
! End Graphics ATI Radeon Server args.
-pn
>
! CONFIGURED FOR DEVICE RADEON

Save the Xserver.conf file and then restart Xwindows using

/sbin/init.d/xlogin stop
-{wait for server to run-down}
-then-
/sbin/init.d/xlogin start

Login and check it again using "/usr/bin/X11/xdpyinfo"

I hope this helps you.

Rick Retterer
HP Services