[Bugs] #4296 sugar UNSP: SugarExt volume control set volume to 0

[Sugar Labs Bugs]

#4296: SugarExt volume control set volume to 0
------------------------------------------+---------------------------------
    Reporter:  dsd                        |          Owner:  erikos     
        Type:  defect                     |         Status:  closed     
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |     Resolution:  notsugar   
    Keywords:                             |   Distribution:  Unspecified
Status_field:  Unconfirmed                |  
------------------------------------------+---------------------------------
Changes (by dsd):

  * status:  new => closed
  * resolution:  => notsugar


Comment:

 In the end this was a kernel bug.

 SugarExt sets its values on a linear scale, and alsamixer reads them on a
 logarithmic scale (dB). And because the kernel had almost 1000dBs of range
 (oops), setting 80% on a linear scale was actually to 0 on the logarithmic
 scale. The problem could even be seen in amixer vs alsamixer (taking sugar
 out of the equation).

 Having shuffled mixers around in the latest XO-4 kernel, things are now
 working.

-- 
Ticket URL: <http://bugs.sugarlabs.org/ticket/4296#comment:1>
Sugar Labs <http://sugarlabs.org/>
Sugar Labs bug tracking system