JDK : JDK 6u11b02_j4b
Platforms[s] : x64-opensolaris-jvm64 GNOME
testbase : /net/vice.russia.sun.com/export/home0/dtf/dtf_ws/suites/6.0/awt

This tests passed on solaris 10 x64

12 testcases

TEST 1/12 6/17 AWT_Modality/Automated/ToBack/ApplicationModalDialog FAIL
TEST 2/12 7/17 AWT_Modality/Automated/ToBack/DocumentModalDialog FAIL
TEST 3/12 8/17 AWT_Modality/Automated/ToBack/ModalDialog FAIL
TEST 4/12 9/17 AWT_Modality/Automated/ToBack/ModelessModalDialog FAIL
TEST 5/12 10/17 AWT_Modality/Automated/ToBack/NonModalDialog FAIL
TEST 6/12 11/17 AWT_Modality/Automated/ToBack/ToolkitModalDialog FAIL
TEST 7/12 12/17 AWT_Modality/Automated/ToFront/ApplicationModalDialog FAIL
TEST 8/12 13/17 AWT_Modality/Automated/ToFront/DocumentModalDialog FAIL
TEST 9/12 14/17 AWT_Modality/Automated/ToFront/ModalDialog FAIL
TEST 10/12 15/17 AWT_Modality/Automated/ToFront/ModelessModalDialog FAIL
TEST 11/12 16/17 AWT_Modality/Automated/ToFront/NonModalDialog FAIL
TEST 12/12 17/17 AWT_Modality/Automated/ToFront/ToolkitModalDialog FAIL

Results:
http://stt-13.russia.sun.com/results/1.6.0_11/b02_j4b/opensolaris/awt/x64-opensol-jvm64/rerun4/stt-robot.SunOS.x86/

Logs:

Testcase Info: Test whether a document modal dialog having a visible Frame constructor still stays on top of the blocked windows even after calling toBack on the dialog
TESTCASE ERR: FAIL: Dialog may be partially hiding the right frame even after calling toBack on dialog
Testcase Status: FAIL
Testcase Info: Test whether a document modal dialog having a visible Dialog constructor still stays on top of the blocked windows even after calling toBack on the dialog
TESTCASE ERR: FAIL: Dialog may be partially hiding the frame even after calling toBack on dialog
Testcase Status: FAIL
Test failed! See the report