Changes between Initial Version and Version 1 of Ticket #14242, comment 10


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Timestamp:
Oct 31, 2018, 8:56:21 AM (5 years ago)
Author:
ttcoder

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  • Ticket #14242, comment 10

    initial v1  
    1 @tidux Let's go straight for the 'extended' kernel messages; with some luck it will be like a cheat sheet, allowing a fairly quick fix.
     1@tidux Let's go straight for better tracing options; with some luck it will be like a cheat sheet, leading to a fairly quick fix.
    22
    33I've found this page [https://www.kernel.org/doc/html/latest/sound/hd-audio/notes.html]. It mentions a few hints. Here's those that seem most interesting to  me; the first one might not be so easy, if so proceed to the next ones:
    … …  
    1111(those seem to be C++ defines, meaning you need to recompile the linux driver ?)
    1212
    13 Seems it's possible to get a direct, simple, dump of init verbs:
     13Seems it's possible to get pin configs directly from terminal; unfortunately the init_verbs can probably not get retrieved, but pin configs might be interesting anyway:
    1414
    1515{{{
    … …  
    2121}}}
    2222
    23 So  presumably you would retrieve the verbs/payloads describe above by typing this in a terminal/xterm:
     23The document mentions "hwC0D0" in the path, whereas your dmesg output mentions "hdaudioC0D0". So some adapting might be needed. Anyway  presumably you would retrieve the data by typing something like this in a terminal/xterm:
    2424
    2525{{{
    … …  
    2828
    2929
    30 This is the tracing that seems hopeful:
     30This is the tracing that seems most hopeful to me:
    3131
    3232{{{
    … …  
    4040
    4141I likely can decode the output by hand, the "hda-decode-verb" stuff mentionned below might not be necessary.
     42
     43I wonder if it retro-actively includes tracing produced by the hda driver during boot-up though. If it does not, maybe it's possible to trigger a re-init of the driver, by hand, using the "reconfig" trick described in the document, after activating tracing.