Stephen Davies wrote:
>
>On Mon, 11 Jun 2001, Karl Lessard wrote:
>
>>Are you using the HALlib? It takes care of a lot of synchronisation
>>issues after the dac initialisation in those 2 files. About the options,
>>I've never seen that in our driver. What it supposed to do?
>>
>
>Hi,
>
>I'm not using the hallib. And I apologise - I did eventually find where
>the sync polarity for the first head is set (in the vgahw stuff).
>
>My problem turned out to be nothing to do with sync polarity. I already
>said that dot clocks <16MHz lock my box. It also turns out that the
>clocking isn't stable below around 20MHz (18MHz and I get a picture, but
>very flickery).
>
>My current workaround is to make my mode 1440x576 - that way I can use a
>27MHz dot clock. Downside is that the pixels are very non-square so most
>X output is squashed up due to assumptions that the pixels are square.
>
>Do you know how low a G200 dotclock can go? I've also got one of those in
>another machine and could use it.
>
>Thanks,
>Steve
>
>
>
>
>>Karl
>>
>>
>>
>>Stephen Davies wrote:
>>
>>>Hi,
>>>
>>>Does the mga driver support the -HSync -VSync options?
>>>
>>>If I compare mga_dac3026.c and mga_dacG.c, I see the former does some
>>>stuff to the RAMDAC to set sync polarity, but I don't see any of that in
>>>the latter.
>>>
>>>I'm trying to output PAL-rate interlaced video. But my TV won't
>>>sync. Don't have a scope, but I'm pretty sure my modeline is right.
>>>
>>>Incidentally, I notice that attempts to set the dot clock on CRTC1 lower
>>>than 16MHz locks my machine.
>>>
>>>Thanks and regards,
>>>Steve
>>>(Sorry: not yet subscribed to the list)
>>>
>>>
>>>
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>>>
>>
>>
>>
>
>
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>
Hi ,
The minimum dot clock for the G200 is about 7Mhz.
Luugi
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