This JCK test hangs since b16:
api/java_awt/GraphicsDevice/indexTGF.html#SetDisplayMode

With deadlock:
Found one Java-level deadlock:
=============================
"AWT-EventQueue-0":
  waiting for ownable synchronizer 0x00000000db65c370, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "AWT-XAWT"
"AWT-XAWT":
  waiting to lock monitor 0x00000000015c8570 (object 0x00000000db6882a8, a sun.awt.X11GraphicsDevice),
  which is held by "AWT-EventQueue-0"

or

Found one Java-level deadlock:
=============================
"AWT-XAWT":
  waiting to lock monitor 0x000000000220e748 (object 0x00000000eb480c38, a sun.a
wt.X11GraphicsDevice),
  which is held by "main"
"main":
  waiting for ownable synchronizer 0x00000000eb455c08, (a java.util.concurrent.l
ocks.ReentrantLock$NonfairSync),
  which is held by "AWT-XAWT"

Dump file attached.