Can bot use Fn+F7 to switch LCD/CRT on Thinkpad X60s
I have use ibm_acpi module in my kernel(2.6.18), and I can use Fn+F4 to suspend to RAM and Fn+F12 to suspend to disk. But the system do not respond to Fn+F7, so I can not switch the LCD and external CRT. Moreover, when I run "echo video_switch > /proc/acpi/ibm/video" in the terminal, no any respond. How to solve this matter?
My laptop is Thinkpad X60s with Intel 945GM graphics chipsets.