This bug has been copied from bug #607037 and has been proposed to be backported to 5.5 z-stream (EUS).
in kernel 2.6.18-194.19.1.el5 linux-2.6-acpi-thinkpad-acpi-lock-down-video-output-state-access.patch
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2010-0839.html
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: On certain ThinkPad models, reading video output controls could lead to a hard-crash of X.org. This update restricts access permissions to /proc/acpi/ibm/video in order to prevent the aforementioned crash.
*** Bug 652123 has been marked as a duplicate of this bug. ***
Deleted Technical Notes Contents. Old Contents: On certain ThinkPad models, reading video output controls could lead to a hard-crash of X.org. This update restricts access permissions to /proc/acpi/ibm/video in order to prevent the aforementioned crash.