On 5/31/16 3:56 PM, Pietro wrote:
Hi,
Here are the answers:
- tracing to make sure you are actually on a CHT device
The device should be CHT (The processor is an Atom X3-Z8300). Can it be that the processor is an X3 series, but the platform is BT and not a CHT? I know many manifacturers simply upgraded their notebooks series from BT to CHT by changing the CPU and mantaining all the other components the same (For example the Audio codec).
How can I trace this?
you see a lot of references to cherrytrail-cr and 22A8, the right ID.
- pastebin dmesg somewhere
Here is it: http://pastebin.com/FnpAD1kg
You have lots of errors or warnings in there. Not sure why, i have
machines that don't behave as badly.
I am not sure why using the CHT firmware leads to an error, somehow you
probably have a combination of issues. I would really start there, if
the regular firmware doesn't work for you something is very wrong.
- sudo cat /sys/bus/acpi/devices/10EC5651:01/status
Here are the results:
/sys/bus/acpi/devices/10EC5651:00/status
Returns 15
this matches what the machine driver expects so that's good.
/sys/bus/acpi/devices/10EC5651:01/status
Returns 0
- enabling DSP loopbacks to see if the DSP consumes data at the right rate. look at the UCM file and change cset "name='pcm1_out mix 0 pcm0_in Switch' off" to on if you record and loopback on USB output this should play at the right speed.
I've changed the value in the HiFi file, but no changes.
How can i enable DSP loopbacks? I'm not an alsa developer so I need some help here :)
you need to record to enable the loopback while you play...
Please let me know if you need other informations.
can you extract the DSDT and pastebin it as well?
On Tuesday 31 May 2016 15:27:45 Pierre-Louis Bossart wrote:
the changes look ok
But I still have the same problem: Audio plays slowly.
It seems the DSP is clocked at 19.2, but the system is still clocked for
25, and these changes doesn't seem to have effects...
no, CHT doesn't have a 25 MHz clock at all so that's just not physically
possible.
Can you try:
- tracing to make sure you are actually on a CHT device
- pastebin dmesg somewhere
- sudo cat /sys/bus/acpi/devices/10EC5651:01/status
- enabling DSP loopbacks to see if the DSP consumes data at the right
rate. look at the UCM file and change
cset "name='pcm1_out mix 0 pcm0_in Switch' off" to on
if you record and loopback on USB output this should play at the right
speed.
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