[coreboot] mute button on X200

Sat Aug 22 18:37:40 CET 2015

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Please disregard this thread. from the #coreboot IRC channel:

<francis7> lynxis, hi
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<lynxis> 0x30 does volumecontrol. I've also written that down in
http://www.coreboot.org/EC:lenovo/x201
<francis7> oh
<lynxis> try to play with that using ectool -w <> -z <>
<francis7> Yes, to see if that changes volume.
<lynxis> you can try to read the disassemlbed acpi code. take a look
on the dsdt. acpi asm is very easy to read.
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<francis7> lynxis, confirmed
<francis7> lynxis, I have this running:
<francis7> sudo watch -n .1 ./ectool -i
<francis7> When I mute (factory bios), 0x30 changes from 0x03 to 0x43
<francis7> When unmuting, it changes back to 0x03
<lynxis> on x201: it's 0x40 or 0x00
<francis7> The same also happens in coreboot.
<francis7> However, on coreboot, no actual muting occurs.
<lynxis> x201: the speaker got muted.
<francis7> ok, wtf
<francis7> I tested it on another X200 with coreboot
<francis7> mute works
<francis7> wtf
<lynxis> francis7: can you send me a dump of the acpi with OEM bios?
<francis7> lynxis, "acpidump > acpidump.log" ?
<lynxis> acpidump -b dump_dir
<francis7> -b outputs nothing
<lynxis> it should dump everything into a directory
<lynxis> sudo acpidump -b .
<francis7> ok now it works
<lynxis> francis7: 0x84 should be the fan speed
<francis7> seems I already have your GPG key
<francis7> (public one)
<lynxis> 0xA0DF8604  fp: 390D CF78 8BF9 AA50 4F8F  F1E2 C29E 9DA6 A0DF
8604
<francis7> yep
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<francis7> lynxis, weird though
<francis7> the mute didn't seem to work earlier.
<francis7> maybe I was only testing it on headphones
<francis7> even in factory bios, the mute only mutes the internal
speakers built into the laptop
<francis7> external speakers/headphones are not muted via that button
<francis7> I apologize for wasting your time....

On 22/08/15 18:40, Francis Rowe wrote:
> 
> 
> On 22/08/15 18:13, Alexander Couzens wrote:
> 
>>> Would it help if I include logs here? If so, which logs?
>> ectool will also show some timers, which are counting upwards in 
>> the dump. Last time I've looked at the ECDT (x201) it doesn't 
>> contain any additional information. There are multiple ways to 
>> provide the information saved in the ECDT. Coreboot is using the 
>> DSDT for that.
> 
>> Let's say you know which byte is changing in the EC ram, what
>> would you do than?
> 
>> Best, lynxis
> 
>> PS: http://www.coreboot.org/EC:lenovo/x201
> 
> 
> Here is the diff (from factory BIOS):
> 
> user at user-ThinkPad-X200:~/Desktop$ diff -u ectool.log
> ectool.mute.log --- ectool.log	2015-08-22 16:14:32.602441403 +0100 
> +++ ectool.mute.log	2015-08-22 16:14:38.780364169 +0100 @@ -2,13
> +2,13 @@
> 
> 00: a6 05 a0 00 fe 96 00 00 1f 02 47 00 00 00 80 00 10: 00 00 ff ff
> f4 3c 87 09 5b ff 83 04 ff ff 2d 00 -20: 00 00 00 00 00 00 00 60 00
> 00 00 00 00 00 00 80 -30: 07 00 02 00 30 04 00 00 00 00 20 10 00 50
> 00 00 +20: 00 00 00 00 00 00 00 df 00 00 00 00 00 00 00 80 +30: 47
> 00 02 00 30 04 00 00 00 00 20 10 00 50 00 00 40: 00 00 00 00 00 00
> 14 04 40 01 00 00 00 00 00 00 50: 00 c0 02 19 df 07 08 16 0e 0a 31
> 04 04 d0 07 48 60: 0d d8 0e cc 10 00 00 00 00 00 00 00 00 00 00 00 
> 70: 00 00 00 00 00 12 30 80 27 32 80 2c 80 80 80 80 -80: 00 00 00
> 06 ce 0e 03 00 00 00 00 00 00 00 6c 00 +80: 00 00 00 06 e3 0e 03 00
> 00 00 00 00 00 00 6c 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 
> 0x27 changes. 0x30 changes. 0x84 changes.
> 
> Here is the diff from coreboot (on another X200, though, so
> probably different EC version):
> 
> user at user-ThinkPad-X200:~/Desktop$ diff -u ectool.log
> ectool.mute.log --- ectool.log	2015-08-22 17:31:27.684144336 +0100 
> +++ ectool.mute.log	2015-08-22 17:31:34.775508137 +0100 @@ -2,17
> +2,17 @@
> 
> 00: a6 04 a0 11 fe 96 00 00 1f 02 43 00 00 00 80 00 10: 00 00 ff ff
> f4 3c 80 01 01 ff ff ff ff ff 00 00 -20: 00 00 00 00 00 00 00 2b 00
> 00 00 00 00 00 00 80 -30: 03 00 00 00 30 04 00 00 00 00 70 10 00 00
> 00 00 +20: 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 80 +30: 43
> 00 00 00 30 04 00 00 00 00 70 10 00 00 00 00 40: 00 00 00 00 00 00
> 14 04 42 01 00 00 00 00 00 00 50: 00 40 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 70: 00 00 00 00 00 12 30 80 30 2f 80 33 80 80 80 80 -80: 00 00 00
> 00 6c 0e 00 00 00 00 00 00 00 00 00 00 +80: 00 00 00 00 6a 0e 00 00
> 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -c0: 33 38 80 80 80 80
> 80 80 00 41 1a 00 00 00 00 00 +c0: 33 37 80 80 80 80 80 80 00 41 0d
> 00 00 00 00 00 d0: 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> e0: 00 00 00 00 00 00 00 00 10 60 b9 06 04 2e 55 03 f0: 37 58 48 54
> 32 34 57 57 13 74 62 b4 13 74 61 9c
> 
> 0x27 changes. 0x30 changes. 0x84 changes.
> 
> Also on this dump, 0xc1 and 0xca change.
> 
> I'm not currently sure what to make of this.
> 

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