[Bug 22576] [KMS] mesa demo spectex broken on rv280

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=22576

--- Comment #7 from Alex Deucher <agd5f at yahoo.com> 2010-04-20 07:11:41 PDT ---
(In reply to comment #6)

> P.S.: bisecting kernel right now, hopefully will have bisect result today. But
> i'll also re-test with current 2.6.34-rc5 kernel (UMS mode) just in case.
> Can it be some wrong-initialized register on-card? I mean KMS code write bunch
> of regs, but at least one of them stuck/not responded to write, and UMS "fix"
> just unlock this reg ? Just possible scenario, i can be completely wrong here
> ...

It's probably a register that KMS is not setting.  I suspect there is some
state that's not getting emitted under KMS that is under UMS.  When you run
UMS, it sets the reg to the appropriate value, then things work under KMS.

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