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authorMatthew Garrett <mjg@redhat.com>2010-03-02 09:51:48 -0500
committerMatthew Garrett <mjg@redhat.com>2010-03-02 09:51:48 -0500
commita58db59a263d4232710af816f3857254b5823633 (patch)
tree977120471e3d34412d2c810c48d0fe2b9547ffc7 /Documentation
parent881a6c25a8453388e3190de94a5e105439a9f806 (diff)
parent88cc83772a3c7756b9f2b4ba835545ad90a08409 (diff)
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Merge branch 'for-upstream/platform-x86_tpacpi' of git://repo.or.cz/linux-2.6/linux-acpi-2.6/ibm-acpi-2.6 into x86-platform
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 75afa12..39c0a09 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -650,6 +650,10 @@ LCD, CRT or DVI (if available). The following commands are available:
echo expand_toggle > /proc/acpi/ibm/video
echo video_switch > /proc/acpi/ibm/video
+NOTE: Access to this feature is restricted to processes owning the
+CAP_SYS_ADMIN capability for safety reasons, as it can interact badly
+enough with some versions of X.org to crash it.
+
Each video output device can be enabled or disabled individually.
Reading /proc/acpi/ibm/video shows the status of each device.