2 monitors, one in 60Hz

raadaar · 04-28-2005, 08:06 AM

Hi

Im using an almost homemade laptop, with a two monitor configuration on a ATI Radeon Mobility 9700. Im running Suse 9.3 with suse's Fglrx-modules... But the xorg.conf is made by fglrxconfig instead of SAX.

The only problem is that my secondary monitor, an Hansol 920P 19", only shows 60Hz.
It is a "Big Desktop"-configuration, with 1280x1024 on both monitors. The primary monitor is the laptops monitor.

So is there a way to get it to run at 85Hz?

From xorg.conf:

Code:

Section "Monitor"
    Identifier  "Monitor0"
    HorizSync   31.5 - 91.1
    VertRefresh 20 - 60
    Option "DPMS"
...
Section "Monitor"
    Identifier  "Monitor1"
    HorizSync   31.5 - 91.1
    VertRefresh 60 - 85
    Option "DPMS"

Chromezero · 04-28-2005, 02:46 PM

I may be wrong on this one, but I think the answer to your question is "no, you can't run your secondary monitor at 85hz". Your primary monitor has a max vert refresh of 60hz, which would limit the output of your vid card to 60hz. Since you're using the same vid card for both monitors, the signal going to both monitors will be the same and will therefore be limited to 60hz. There may be a way to independently configure them, but I've never seen it. Sorry for the bad news...

bulliver · 04-28-2005, 02:48 PM

Use a discrete value instead of a range, ie:

Code:

Section "Monitor"
    Identifier  "Monitor1"
    HorizSync   31.5 - 91.1
    VertRefresh 85
    Option "DPMS"

Keep in mind that xorg will give up if the monitor is nor capable of 85hz.

@chromezero: you may very well be right here, but I am reasonably sure that the two monitors can be run at different refresh rates, and even different resolutions.

Chromezero · 04-28-2005, 03:14 PM

Now I'm curious about this myself. I would think it would depend on the vid card itself. If the two outputs are just paralleled, then the output to each monitor would be the same. For seperate outputs, would the vid card have to have independent hardware for each output?

raadaar · 04-28-2005, 03:34 PM

I know that the card is able to fix it. I had it working in Slackware 10.1. It's also working under windows...

The only difference now is that i run on suse's driver, found on their ftp. I dont think my configuration is different, but im not sure...

Code:

Section "Monitor"
    Identifier  "Monitor1"
    HorizSync   31.5 - 91.1
    VertRefresh 85
    Option "DPMS"

Didn't make any difference.

If i remember this right, I ran fglrxconfig, started KDE, and was then able to change the Hz to 85 through KDE. But it was a while ago... In slackware...

Thanks for your help

Chromezero · 04-28-2005, 03:48 PM

You might give Sax2 a shot. I'm assuming Sax2 is included with 9.3...

jschiwal · 04-28-2005, 03:52 PM

Perhaps if you included mode lines for 60hz and 85hz.

The 'gft' program might help you there:
gft <horizontal> <vertical> <refresh_rate> -x

Also google for the X-timings how-to. It has a formulas to determine the ram needed for a resolution and color depth, as well as the calculation for the minimun clock rate needed at a resolution and refresh rate.

Reading through the logs could indicate if the server tried a higher rate and it failed or if it never tried 85 hz at all.

raadaar · 04-29-2005, 06:58 AM

I tried Sax2, no success. It only found one monitor, and there was no chans to add one more.

Then I tried to read the xorgs logfiles. But I'm not sure I read the right one...
In /var/log i found:

XFree86.0.log
XFree86.0.log.old
Xorg.0.0.log
Xorg.0.0.log.old
Xorg.0.log
Xorg.0.log.old
Xorg.99.log
Xorg.99.log.old

I dont know if it tried 85Hz and failed. I can put the log-files and xorg.conf on a server if u want to read them?

Thanks so far