[Bug 17902] [830M missing dvo driver] need support for DVO-LVDS via na2501

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=17902

--- Comment #75 from thor at math.tu-berlin.de 2012-05-29 12:13:12 PDT ---
Well, I do have a documentation from National Semiconductors, but there is
nothing that would define frequencies or bandwidths - only the sync pulses can
be set, and intput to syncs. So I played writing values into all other
registers with i2cset, but with little success - not any change, actually,
except for the mentioned register. Ok, and you could block off the screen as
well by disabling the sync pulses (not much of a surprise, I guess).

However, leaving all that aside - I'm no longer able to talk to the chip, upon
rebooting i2cdetect gave me all blanks on bus #6. I really wonder what is going
on. Could it be that there is some additional "gating" going on that blocks off
access to this chip unless another register is set? Is that typical?

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