I think I found the actual issue in the X log:

Driver needs flags 1, incompatible with nested, deleting.
Driver needs flags 0, incompatible with nested, deleting.
Driver needs flags 0, incompatible with nested, deleting.
(II) [XMir] Using Radeon device from Mir.
(II) [KMS] Kernel modesetting enabled.
X: ../../../../include/privates.h:123: dixGetPrivateAddr: Assertion 
`key->initialized' failed.

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https://bugs.launchpad.net/bugs/1219081

Title:
  Black screen when usc is installed

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