this tool is useful to get Intel register value.

Steps:

1. download intel-gpu-tools:
e.g. the release under http://xorg.freedesktop.org/archive/individual/app/ or the latest code at git://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.
Install it by standard procedure: autogen.sh, configure, make, and make install.

2. run the tool to get the output:
$ tools/intel_reg_dumper > intel_reg_dumper.txt

3. Report bug with intel_reg_dumper.txt attached.