Mono sound only

This is a really annoying problem: I only get mono sound with my headphone jack - the builtin laptop speakers are doing fine, though. I had this problem a few days ago, I asked for help in another forum but right after that (after a reboot) it worked again. After I used jack server for a while I noticed that there was mono sound only again, system-wide, and it couldn't be fixed with a reboot. I think I should mention that I had the same problem on ubuntu before (about 5 days ago; installed arch linux afterwards) too.
(i don't know how to use code tags yet, sorry)
[alexander@alexander-p6634 ~]$ LANG=C aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CX20585 Analog [CX20585 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: CX20585 Digital [CX20585 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
[alexander@alexander-p6634 ~]$ dmesg | grep sound
[ 6.822506] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[ 6.822649] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[ 6.822787] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
[alexander@alexander-p6634 ~]$ dmesg | grep snd_
[ 6.576589] snd_hda_intel 0000:00:1b.0: irq 47 for MSI/MSI-X
[alexander@alexander-p6634 ~]$ lsmod | grep snd_
snd_hda_codec_hdmi 29298 1
snd_hda_codec_conexant 36191 1
snd_hda_intel 35816 6
snd_hda_codec 145920 3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep 6364 1 snd_hda_codec
snd_pcm 76860 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 7330 2 snd_pcm,snd_hda_intel
snd_timer 18687 1 snd_pcm
snd 58893 18 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_hda_codec,snd_hda_intel
Maybe it will be gone when I'll do some reboots, there are often problems without any cause (that makes sense, at least; today my laptop died for 3 hours, i couldn't turn it on anymore, and when i took it to a repair service, when i explained it to the guy he tried pressing the power button and it just worked again)

It went away for a while and came back right now, I don't know how to reproduce it, I don't know the cause. This is really bothersome.
The built-in speakers work normally, by the way.

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