[Bug 90220] Black screen with KMS on powerpc iBook

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90220

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
This line in dmesg indicates a problem with the dot clock:

[drm:drm_calc_timestamping_constants] *ERROR* crtc 14: Can't calculate
constants, dotclock = 0!

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