Mike,

Many thanks for providing a very clear explanation,

    Regards    Steve

----- Original Message ----- 
From: "Mike Gorchak" <community-noreply@qnx.com>
To: "photon-graphics" <post68207@community.qnx.com>
Sent: Wednesday, September 22, 2010 11:41 AM
Subject: Re: Multi head photon system


>> I would like to have 3 different applications, each calling Photon 
>> drawing
>> functions for display on both my on-board (i830) graphics and each of the 
>> 2
>> outputs on a Matrox dual-head card.
>
>> My existing system uses only the on-board graphics  and my Photon startup 
>> file
>>  consists of a simple call to io-display, Photon and io-graphics.
>
> You have to run io-display two times, one for the each physical video 
> adapter. For example:
>
> io-display -dvid=0x8086,did=0xXXXX -c/etc/system/config/display.conf.i830
> io-display -dvid=0x102b,did=0xXXXX -c/etc/system/config/display.conf.matrox
>
> And preliminary content of the each configuration file
>
> display.conf.i830:
> ############################################
> device {
> photon {
> driver {
> drivername=i830
> modeopts=
> }
> }
> drivername=i830
> modeopts=
> vid=0x8086
> did=0xXXXX
> deviceindex=0x0
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=0
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> }
>
> display.conf.matrox:
> ############################################
> device {
> photon {
> driver {
> drivername=matrox
> modeopts=
> }
> }
> drivername=matrox
> modeopts=
> vid=0x102b
> did=0xXXXX
> deviceindex=0x0
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=1280
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=2560
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> }
>
> Please take a look on the "drivername" parameter, you have to specify 
> correct driver name in both config files. And then take a look on the 
> xoffset and yoffset parameters, you have to specify your displays layout 
> manually, in my example they are placed horizontally, one after each 
> other. First display belongs to the i830, and the rest two belong to 
> matrox driver.
>
>> How do I modify this file for multi-head Photon use and how do I 'point' 
>> each
>> of my applications at the correct display?
>
> The easiest way is to run each window at specific coordinates. For 
> example, you have three displays, all placed horizontally and each display 
> is set to 1280x1024 video mode (like in the configuration files above):
>
> display 0: 0-1279
> display 1: 1280-2559
> display 2: 2560-3839
>
> So, if you want to place your window at display 1, just set window origin 
> coordinates in range of 1280-2559 on x-axis.
>
>
>
>
> _______________________________________________
>
> Photon microGUI
> http://community.qnx.com/sf/go/post68207
>
> 

My photon startup script now consists of

io-graphics -dxxxxxxxxxx (i830)
io-graphics-dyyyyyyyyyyy (matrox)
/usr/photon/bin/Photon &
/usr/photon/bin/io-graphics

Should there also be 2 io-graphics?

Running each of these lines from the command prompt works without errors. 
There is no evidence of any video from the matrox card whereas the monitor 
connected to the on-board graphics shows a grey background when io-graphics 
is run. The h/w itself works OK since I can change the Bios setting to 'init 
pci display first'. One matrox output then shows the qnx boot-up info. I am 
just wondering if anything else is needed to 'spread' Photon over the 3 
displays? Alternatively, perhaps I am being mis-led by the lack of signal on 
the monitor and it is just a case of getting an application to write to this 
area,

    Thanks for your help,   Steve



----- Original Message ----- 
From: "Mike Gorchak" <community-noreply@qnx.com>
To: "photon-graphics" <post68207@community.qnx.com>
Sent: Wednesday, September 22, 2010 11:41 AM
Subject: Re: Multi head photon system


>> I would like to have 3 different applications, each calling Photon 
>> drawing
>> functions for display on both my on-board (i830) graphics and each of the 
>> 2
>> outputs on a Matrox dual-head card.
>
>> My existing system uses only the on-board graphics  and my Photon startup 
>> file
>>  consists of a simple call to io-display, Photon and io-graphics.
>
> You have to run io-display two times, one for the each physical video 
> adapter. For example:
>
> io-display -dvid=0x8086,did=0xXXXX -c/etc/system/config/display.conf.i830
> io-display -dvid=0x102b,did=0xXXXX -c/etc/system/config/display.conf.matrox
>
> And preliminary content of the each configuration file
>
> display.conf.i830:
> ############################################
> device {
> photon {
> driver {
> drivername=i830
> modeopts=
> }
> }
> drivername=i830
> modeopts=
> vid=0x8086
> did=0xXXXX
> deviceindex=0x0
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=0
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> }
>
> display.conf.matrox:
> ############################################
> device {
> photon {
> driver {
> drivername=matrox
> modeopts=
> }
> }
> drivername=matrox
> modeopts=
> vid=0x102b
> did=0xXXXX
> deviceindex=0x0
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=1280
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> display {
> xres=1280
> yres=1024
> refresh=60
> pixel_format=rgb565
> photon {
> enabled=1
> xoffset=2560
> yoffset=0
> cursor=hardware
> input_group=1
> }
> }
> }
>
> Please take a look on the "drivername" parameter, you have to specify 
> correct driver name in both config files. And then take a look on the 
> xoffset and yoffset parameters, you have to specify your displays layout 
> manually, in my example they are placed horizontally, one after each 
> other. First display belongs to the i830, and the rest two belong to 
> matrox driver.
>
>> How do I modify this file for multi-head Photon use and how do I 'point' 
>> each
>> of my applications at the correct display?
>
> The easiest way is to run each window at specific coordinates. For 
> example, you have three displays, all placed horizontally and each display 
> is set to 1280x1024 video mode (like in the configuration files above):
>
> display 0: 0-1279
> display 1: 1280-2559
> display 2:...