[GLLUG] dual head question

[Marr]

On Saturday 31 May 2003 07:43am, Mark Szidik/mlc wrote:

> <FONT face="Default Sans Serif, Verdana, Arial, Helvetica, sans-serif"
> size=2><DIV>I have a Radeon 7000/VE that came with my new Dell PC.&nbsp;

Yuk! HTML mail....

Converted version (without XF86Config file details):

---------------
I have a Radeon 7000/VE that came with my new Dell PC.  It is dual head 
capable, so I thought I'd put that feature to work right away.  Well, I am 
close.  When I start X (running RH's bluecurve temporarily) both displays 
come up and look as I would expect them.  Monitor0 works perfectly When I try 
to move my mouse to monitor1 the screen goes blank and the monitor goes into 
powersaver mode.  So I know that the signal to the display drops, but why?  I 
suspect Xinerama, but when I remove it the same thing mappens.  Any ideas?
 
Thanks, 
-Mark
---------------

Hi Mark,

I've recently been working with dual-head on my Shuttle SN41G2 (small form 
factor) PC, which comes with the nForce2 chipset. It supports dual-head 
natively (2 VGA connectors on mobo). Therefore, I'm pretty familiar with the 
XF86Config file changes needed.

Having said that, I don't see anything obviously amiss in your configuration.

My first guess would be to (temporarily) disable DPMS on the monitors, but it 
looks like you've already thought of that.

My next guess would be to start disabling things in the "Module" section like 
GLX, DRI, DBE, etc since I've read of problems with some of those things 
(can't remember which or any details) with multi-head, especially with 
accelerated multi-head.

Also, check into the options for the 'radeon' XF86 driver. A year or so ago, I 
had to add this line to the "Device" section for an old Hercules PCI card, 
using the 'tseng' XF86 driver, in a 3-headed configuration. Without this 
line, it just wouldn't work!

    Option "noaccel"      # when problems with accelerator

Also, looking back at a similar email thread from a year ago, I see that Mike 
Rambo had problems with a Radeon 7000 (PCI) in a dual-head setup. His 
(private) email to me after he got a passable working setup indicated that he 
"can't get color depth beyond 15 bit". It sounded as if the 'radeon' driver 
was rather immature at that time. His problem was distinctly different than 
yours, but maybe he can shed some light on this.

HTH some....

Bill Marr