I have some strange idea in the past when I'm debugging tpb's code.
After I detect a mute state, I immediately toggle the mute property
the PCM in ALSA, then unmute the hardware.
Now I can detect mute again. Therefore once the button is pressed, the
mute property is toggled.
But it seems tricky.
As far as I know,
Thinkpad T400 and T500 wihch I met are in the same status with the
volume control.
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Sincerely,
Yang Zhe
--
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May I ask a simple question?
What's the difference between ec and nvram?
By echo 0x30 0x** > ecdump, I discover something...
In the driver thinkpad_acpi.c, file /proc/acpi/ibm/volume is handled
in lines 5652~5737, function volume_read(), volume_write(), and it's
read through acpi_ec_read(). But i
ne after some time, whether the
mute bit changed, if it was changed, mute the alsa sound.
In fact, tpb provide some functions, but the code of tpb is somehow bad...
--
Sincerely,
Yang Zhe
--
Crystal Reports - New Fre
Thank you for your responce.
Now let's focus on the mute key..
If I plugged a headphone, the mute key won't mute the sound in
headphone, then the mute key is lack of functional..
So that I think it's better to send a keycode, or emulate a keycode
against the mute bit.
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ven or odd)
now echo mute > volume, the byte comes 0xc1. and the sounds are not muted.
I think that there is something wrong with the handle of the volume
key, but i have a sketch on the code and can't figure it
