Bugzilla – Bug 12985
Audible hiss using headphone jack
Last modified: 2009-10-14 09:02:46 UTC
When music is not playing or paused, a loud hiss is heard on the headphone output jack. Tried with 3 different headphones with same result. Using firmware r6749.
Is this more or less than with Boom? Fab4?
It's LOT more than Fab4 and Boom. I have a PB1. Let me check if it's only my unit.
Tried it out on a PB2 unit. No audible hiss.
Ahhhhhh, I forogt about this one. This isn't so invalid after all. The PB1 units had HPLCOM tied to HPRCOM, and if the dac was configured wrong, it would do this (and draw a ton of current). Richard, did you just do something with HPLCOM and HPRCOM configuration? -Caleb
Reset priority before triage.
Yes, to fix the headphone pop on power on. Do we need to make that dependent on the hw revision? When can we retire the PB1's?
Hmm, that's strange. the 'COM' signals should just be disabled all together. You're saying you need them turned on to reduce the pop?
What should the register settings be, and I'll verify they are set correctly for the PB1 boards. The COM are disconnected on PB2 and onwards so should not matter, right?
This only affects PB1 units.
this is an administrative shuffle on priority fields to help make better judgment on the top end of the priority list. P4->P5, P3->P4, and P2->P3.
wontfix because we're going to discontinue pb1 units anyway.