Norbert Gerhards wrote:
Hi,
I recently switched from an old CRT monitor to
an IBM TFT, running 1024x768 @ 60 Hz.
My machine is a Sun Ultra Enterprise 2 with a
Sun SBus card TG+, found by debian as 'cgsix'.
Although I entered [EMAIL PROTECTED] in Open BootPROM,
the horizontal frequency is obviously not 60 Hz,
but higher, which results in a very 'unsteady'
screen.
Where and how can I force the 60 Hz to the cgsix
driver?
Thanks in advance,
Norbert
Hi Norbert,
Unfortunately Sun doesn't support [EMAIL PROTECTED] the
TGX+ (Bt467 RAMDAC). It is supported on the regular TGX
(Bt 458 RAMDAC) though. The supported frequencies for
1024x768 on the TGX+ are 66hz and 77hz.
If I remember correctly, the resolution/refresh rate can be set
either in the OBP or by grounding the proper sense pins on the
video connector, and I believe the OBP setting has priority but
I might be mistaken.
The stability issues that you're seeing might also be related to
the composite sync (R/G/B/S) coming from the framebuffer if
the monitor you're trying to use is expecting separate
horizontal/vertical sync (R/G/B/H/V).
More info can be found here:
http://mediacast.sun.com/users/Barton808/media/Sbus_cgsix_graphics_cards800-5114-10.pdf
-Brian
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