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Description of problem:
It became blank screen after upgrade gdm packages in 20100701 tree on two laptops - T400 and T200. Everything was working fine after downgraded to,

gdm-2.30.2-8.el6.x86_64.rpm
gdm-plugin-fingerprint-2.30.2-8.el6.x86_64.rpm
gdm-user-switch-applet-2.30.2-8.el6.x86_64.rpm

Version-Release number of selected component (if applicable):
gdm-2.30.4-4.el6.x86_64.rpm
gdm-plugin-fingerprint-2.30.4-4.el6.x86_64
gdm-user-switch-applet-2.30.4-4.el6.x86_64

How reproducible:
always

Just curious, looks like this might be related to selinux-policy byg #609577?

Cai, do you see any AVC denials in audit.log, dmesg, or /v/l/messages? What happens if you set the system into SELinux permissive mode?

The new gdm doesn't work for me either, but I don't have any denials in logs. Permissive mode doesn't help. gdm-binary is stuck in an endless loop:

open("/etc/passwd", O_RDONLY|O_CLOEXEC) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=2071, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb77bf000
read(4, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 2071
close(4)                                = 0
munmap(0xb77bf000, 4096)

This behavior is similar to what's described in bug 610498.

*** This bug has been marked as a duplicate of bug 610498 ***