Re: Dual Head on Dell 640 ATI Radeon Mobility 7500

[Alex Deucher <agd5f yahoo com>]

weird.  I think there is a bug in the recent cvs radeon code that seems
to cause clone mode to override other modes on the second head.  I
assume you are using xfree 4.3.0?  if you are using one of the newer -8
or -10 rpms from Mike, they have the newer cvs code. try backing off to
the version that came with rh9 (assuming you are using redhat 9), or
replace your radeon_drv.o with this one:

http://www.botchco.com/alex/radeon/430bugfix/radeon_drv.o

it fixes the dualhead cursor/screen blank bug, but leaves out the new
ddc and clone code.  My new cvs mergedfb code gets rid of the old clone
code (has it's own) and seems to work ok, so there might be a bug in
the clone logic.  My guess is something having to do with the monitor
detection and clone mode enabling.  I suspect clone gets explicitly
enabled when a second monitor is detected, even if a user wants to do
two separate distinct heads.  

Alex

--- Hugh Caley <Hugh_Caley affymetrix com> wrote:
> Now that is strange.  If I set the primary to 1024x768 also, the 
> secondary screen becomes readable.  However, the secondary screen is
> a 
> mirror of the primary screen, unless I'm actually doing something
> with 
> the cursor on the secondary screen, in which case whatever I'm doing 
> smears over the mirror image.  Hard to describe. 
> 
> Hugh
> 
> >does it work with two smaller modes (like 102x768 and 1024x768)?  I
> >think the max frambuffer size on radeon might be 2048x2048, that
> might
> >be where you corruption is coming from.  It might be able to be
> >extented to 4096x4096, but I'm not too familiar with that aspect of
> the
> >hardware.  the ati and radeon drivers are the same.  ati is just a
> >wrapper that calls the appropriate chip driver (mach64, r128 or
> >radeon).
> >
> >Alex
> >
> >
> >--- Hugh Caley <Hugh_Caley affymetrix com> wrote:
> >> I'm having some problems getting dual head and Xinerama working on
> my
> >> 
> >> Dell 640 laptop.
> >> 
> >> The attached XF86Config will give me the two displays (second
> display
> >> is 
> >> a Dell 1024x768 LCD attached to the laptop's VGA port).  The
> primary 
> >> display has some artifacting but basically works.  The secondary
> >
> 
> -- 
> Hugh Caley, Unix Systems Administrator
> Affymetrix Inc., 510-428-8537
> Hugh_Caley affymetrix com
> 
> 
> 
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