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"Sync. out of range" solution for DP17MO monitor and ATI Rage XL

Just in case someone else gets in the same trouble...

Recently I tried to install Debian sarge (testing) and I found out there 
is a trouble with getting XFree86 4.3.0 to work on Sun Blade 150.
This box has Sun DP17MO monitor and on-board ATI Rage XL video card
with 8MB RAM. This combination refused to work nicely in XFree86 4.3.0,
instead the monitor was still displaying a floating "Sync. out of range" 

In Debian woody there was working XFree86 4.1.0 so I was desperate to
get working XFree86 4.3.0 in Debian sarge on the same hardware.
And this is what I did:

- checked carefuly /var/log/XFree86.0.log on woody
- found a line:

(--) ATI(0): Reference clock 315/11 (28.636) MHz.

- checked /var/log/XFree86.0.log on sarge
- found a line:

(--) ATI(0): Reference clock 157.5/11 (14.318) MHz.

- found a page:

- and finally I put in the /etc/X11/XF86Config-4 file
  an extra line in "Device" section:

Section "Device"
        Identifier      "Generic Video Card"
        Driver          "ati"
        Option          "ReferenceClock"        "28.636 MHz"

^^ the line:  ^^
        Option		"ReferenceClock"	"28.636 MHz"
^^ was needed ^^

Now I have fully functioning XFree86 4.3.0 in Debian sarge.
Oh, joy :-)

I hope this may help someone out there...

Wiktor Wandachowicz

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