Kubuntu and Ubuntu are the same in terms of kernel/drm/kms stuff.
If you get a black screen after the boot splash you are not affected by this bug.
In addition this bug is about a dual-link DVI issue and has nothing to do with dual-head setups (remember, dual-link DVI is for digital signals higher than WUXGA [1920 × 1200]).
So you'll have to see if there is another bug available that looks like yours or just file a new one.
Kubuntu and Ubuntu are the same in terms of kernel/drm/kms stuff.
If you get a black screen after the boot splash you are not affected by this bug.
In addition this bug is about a dual-link DVI issue and has nothing to do with dual-head setups (remember, dual-link DVI is for digital signals higher than WUXGA [1920 × 1200]).
So you'll have to see if there is another bug available that looks like yours or just file a new one.