Issue in starting Oracle 11g Installation - Display Variable

Hi Experts,

I am getting the below error message when I run ./runinstaller

"Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed"

also, xclock was failed before executing ./runinstaller,

As per the installation guide I set the display variable,

The "Display variable" is working for users root and sidadm. However, for orasid display variable is not working,

any idea,

I have already refered Oracle11g Installation issues and SAP note

and 1431796 - Oracle 11.2.0: Troubleshooting the Software Installation

Additional information :

output of >> ls -la /usr/bin/xdpyinfo

-rwxr-xr-x 1 root root 36944 May 24  2013 /usr/bin/xdpyinfo

Oracle version : 11g

OS: SUSE Linux Enterprise Server 11 (X86_64)

Oracle Media :

51047701    ORACLE:11.2:RDBMS:Oracle RDBMS 11.2.0.4 for Linux X86_64 DVD:LINUX_X86_64:LINUXX86_64:D51047701

51047688    ORACLE:11.2:CLIENT:Oracle CLIENT 11.2.0.4 V1:D51047688

Thanks