[rhelv6-list] Opinions on multi-head

[Jussi Silvennoinen]

>> > > >  As far as I know, ATI cards can only drive more than two displays if
>> > > >  you're using pure DisplayPort protocol. Using passive DP->DVI 
>> > > >  adapters
>> > > >  you can only drive two monitors.
>> > > 
>> > >  ATI cards (in my case a 5770) are fine driving one monitor via an 
>> > >  active
>> > >  DisplayPort->DVI adapter and two more by DVI directly for a total of
>> > >  three. It's the configuration I am running right now.
>> > 
>> >  I wound up going with the ATI FirePro v4900 for triple head on RHEL6.
>> >  I am using the DVI port, and two DisplayPort to DVI cables to drive
>> >  three monitors.
>> > 
>> >  An interesting note... The AMD binary driver locked up the machine.
>> >  Using the native RHEL driver, all three screens work, and I get
>> >  accelerated X and compiz works great.
>>
>>  Out of curiosity, what kind of performance do you get? In something
>>  rudimentary like glxgears.
>
> Sorry for the delay in answering, I was travelling all week. It's not 
> spectacular, but certainly usable for my purposes. Like I said, I am not a 
> gamer, all I wanted was compiz to work on three heads. I just got:
>
> [tcameron at case ~]$ glxgears
> Running synchronized to the vertical refresh.  The framerate should be
> approximately the same as the monitor refresh rate.
> 298 frames in 5.0 seconds = 59.561 FPS
> 300 frames in 5.0 seconds = 59.903 FPS

Hum, how about 'export vblank_mode=0 ; glxgears'? Gaming aside, 2500fps 
from a Nvidia NVS290 wasn't enough to run compiz on a 3200x1200 dualhead 
smoothly enóugh for my taste. 9000fps from a Quadro 600 did the trick.
Both using Nvidia's proprietary driver.

-- 

   Jussi