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ThinkPad X220 volume level unsupported

Regarding the ThinkPad X220.

cat /proc/acpi/ibm/volume reports: level unsupported.

Other events such as thinklight and video report: level supported, but still tpb will not show any onscreen display (OSD).  I know that xosd is working on my system from a test program I ran.

[root@myhost ~]# cat /proc/acpi/ibm/volume
level:		unsupported
mute:		off

[root@myhost ~]# cat /proc/acpi/ibm/light
status:		off
commands:	on, off

[root@myhost ~]# cat /proc/acpi/ibm/video
status:		supported
lcd:		disabled
crt:		disabled
dvi:		disabled
auto:		disabled
commands:	lcd_enable, lcd_disable
commands:	crt_enable, crt_disable
commands:	dvi_enable, dvi_disable
commands:	auto_enable, auto_disable
commands:	video_switch, expand_toggle

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