Applied the patch to 2.6.34 from kernel.org and it works.
However as with err_most+=50 I still get the wrong resolution on external monitor when booting with VGA Cable connected.
2.6.32, which didn't have the KMS bug, booted with correct resolution on external monitor. So maybe someone can check, what changed from 2.6.32 to 2.6.33.
Applied the patch to 2.6.34 from kernel.org and it works.
However as with err_most+=50 I still get the wrong resolution on external monitor when booting with VGA Cable connected.
2.6.32, which didn't have the KMS bug, booted with correct resolution on external monitor. So maybe someone can check, what changed from 2.6.32 to 2.6.33.