DVI output not visible on LCD with DVI, VGA output works - summary

Martin Langhoff martin.langhoff at gmail.com
Wed Jan 17 12:29:51 PST 2007

On 1/18/07, Martin Langhoff <martin.langhoff at gmail.com> wrote:
> the _work_ monitor (the one that usually worked) doesn't come up. So
> I've captured the registers, diff'd them against the known-good set,
> and found that re-setting TMDS_PLL_CNTL and TMDS_TRANSMITTER_CNTL made
> it work again.

So the executive summary seems to be: the radeon driver v6.2 does not
set TMDS_PLL_CNTL and TMDS_TRANSMITTER_CNTL when it starts without the
ext monitor attached. It also forgets to set them with _some_ ext
monitors, even though it does see the ext monitor attached.

In terms of comparing the EDID/DDC info from my work and home
monitors, I can't convince the get-edid/parse-edid utils to look at
anything but the 1st monitor (ie: laptop lcd). How can I get the
edid/ddc data?



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