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Created attachment 1058798 [details]
Screenshot showing an example of the rendering issue.

I installed the nightly version of rhel-7.2 to test something, and it was almost unusable because large areas of the screen were black, and the display was very flickery (sometimes displaying background images on top of foreground windows). 

I'm testing this in a vm, but I am able to reproduce this with both VNC and Spice, and I am also able to reproduce with both the "QXL" driver and the "VGA" driver. 

My colleague Pavel Grunt (CCed) verified that it also happened on his machine and said that the behavior started when upgrading from xorg-x11-server-Xorg-1.17.2-3.el7.x86_64 to xorg-x11-server-Xorg-1.17.2-4.el7.x86_64. But he also suggested that the issue does not occur when using xfce with the new X server.

Created attachment 1058995 [details]
screencast of the problem

old images are showing up

As Jonathon mentioned downgrading to 
 xorg-x11-server-common-1.17.2-3.el7.x86_64.rpm
 xorg-x11-server-Xorg-1.17.2-3.el7.x86_64.rpm
avoids the problem

chatted with ajax about this and we debugged it.  Patch needs to unconditionally disable GLX_MESA_copy_sub_buffer

s/disable/enable/ above

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHEA-2015-2198.html