I can confirm that I have the exact same problem with the headphones
jack.  After a fresh reboot it continue to work after a suspend-to-ram
/wake-up cycle, but after sleeping/waking the second time it stops
working.  I find it curious that it works at all (after the first cycle)
rather than just either working or not working at all.

My laptop is a Thinkpad X41 (non-tablet version).  To be specific, I'm
using the snd-intel8x0 driver, *not* the snd-hda-intel driver. Currently
running Jaunty.

Through searching I have found this: https://lists.ubuntu.com/archives
/kernel-team/2006-March/000699.html

There is no mention of *why* it needs to be blacklisted. Is it possible
that due to changes in the past 3+ years this blacklisting is no longer
necessary?  At one point I pulled down the alsa source and trying to
grok it for some sort of obvious error, but I couldn't make heads or
tails of it.

My suspicion is that this is a hardware/driver issue. The kernel isn't
issuing any errors or warnings, so maybe after waking up the second time
some module isn't sending the right messages/flipping the right bits
with respect to the hardware?

-- 
speakers are unmuted after resume from suspend while headphones are plugged in
https://bugs.launchpad.net/bugs/101986
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