[Bug 1322] Background noise during conversation

bugzilla-daemon at bugzilla.openmoko.org bugzilla-daemon at bugzilla.openmoko.org
Mon Apr 7 11:31:47 CEST 2008


------- Additional Comments From werner at openmoko.org  2008-04-07 11:31 -------
Following up on the GTA02 phone conference:
The ALSA-related item is "Amp Stat". Muting it kills the GSM download
noise, but the mechanism if independent from

Thus, the "time bomb" only ticks if
Amp_Stat != Muted && download == enabled

where the value of "enabled" is 1 without Holger's patch, and 0 without it.

Since u-boot already sets this GPIO to the correct value, the easiest
solution is if Linux does not change it. In my somewhat dated rootfs, I
found the following places where it does change it:

        [ -n "$GSM_DL" ] && ( echo "1" >$GSM_DL; sleep 1 )                      

So just removing this line should solve the problem. It may also be worth
checking if gsmd or any wrapper or such tries to change "GSM_DL" as well.

Oh, and svn.internal.openmoko.org/trunk/production_testing/gta02-dm2/src/dm2.c
has a few writes to /sys/bus/platform/devices/neo1973-pm-gsm.0/download,
so this probably needs some updating as well.

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