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thinkpad x60s上Fn+F7无法切换显示器



内核中加入了ibm_acpi,Fn+F4和Fn+F12都有反应了,但是Fn+F7切换显示器却没有任何响应,在终端里面用命令"echo crt_enable > /proc/acpi/ibm/video"或者"echo video_switch > /proc/acpi/ibm/video"也都没反应。
为什么Fn+F4和Fn+F12都能用,而Fn+F7却不能用呢?怎么能够解决这个问题?

机器为thinkpad x60s,显卡是i945

多谢!

gulfstream

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