NPE at 2d_fillscreen tests at Ubuntu x64

JDK/JRE tested: JDK 1.6.0_19-b02 j4b
OS/architecture: Ubuntu x64
Reproducible: Always
Reproducible on machine: stt-87
Is it a Regression: Not sure

Test result on FCS: Pass on 1.6.0 FCS
Test run log location: http://vice.russia.sun.com//newroot/results/1.6.0_19/b02_j4b/2d/ubuntu-x64-64/1.6.0_19_b02_j4b_ubuntu-x64-64_03/analysis.html
Steps to reproduce:
1.Login to stt-87
2.Install appropriate jdk
cd to /net/stt-13/export/home0/results/1.6.0_19/b02_j4b/2d/ubuntu-x64-64/1.6.0_19_b02_j4b_ubuntu-x64-64_03/ResultsDir/NullDisplayModeTest
run Automated.tlog
NPE is thrown:
java.lang.NullPointerException
at sun.awt.X11GraphicsDevice.setDisplayMode(X11GraphicsDevice.java:356)
at NullDisplayModeTest.main(NullDisplayModeTest.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javasoft.clientsqe.tonga.TTBuilder.main(TTBuilder.java:76)