The x86 machine with kernel 3.4.4 was fail of sound setup. Also test Front Left get sound on right speaker and Front Right silence on both. The name of hardware is 'K9N Neo'. Does i right the 'Hardware name' not english, that how to hardware? [ 22.210277] ------------[ cut here ]------------ [ 22.210285] WARNING: at kernel/irq/manage.c:1193 __free_irq+0x91/0x190() [ 22.210287] Hardware name: MS-7260 [ 22.210288] Trying to free already-free IRQ 0 [ 22.210290] Modules linked in: snd_mpu401(+) snd_mpu401_uart snd_seq_midi snd_rawmidi snd_seq_midi_event ttm snd_seq snd_timer snd_seq_device drm_kms_helper drm nv_tco gspca_pac207 gspca_main i2c_nforce2 i2c_algo_bit videodev snd mxm_wmi soundcore video snd_page_alloc ppdev wmi ns558 lp gameport k8temp parport_pc parport hid_a4tech usbhid hid usb_storage uas floppy forcedeth sata_nv pata_amd [ 22.210313] Pid: 588, comm: modprobe Tainted: G I 3.4.4 #2 [ 22.210315] Call Trace: [ 22.210320] [<c1032b02>] warn_slowpath_common+0x72/0xa0 [ 22.210323] [<c10adc01>] ? __free_irq+0x91/0x190 [ 22.210326] [<c10adc01>] ? __free_irq+0x91/0x190 [ 22.210329] [<c1032bd3>] warn_slowpath_fmt+0x33/0x40 [ 22.210332] [<c10adc01>] __free_irq+0x91/0x190 [ 22.210335] [<c10ade73>] free_irq+0x43/0xa0 [ 22.210338] [<f82659ed>] snd_mpu401_uart_free+0x1d/0x30 [snd_mpu401_uart] [ 22.210343] [<f826a211>] snd_rawmidi_free+0x71/0x80 [snd_rawmidi] [ 22.210346] [<f826a230>] snd_rawmidi_dev_free+0x10/0x20 [snd_rawmidi] [ 22.210355] [<f81e273d>] snd_device_free+0x5d/0xc0 [snd] [ 22.210358] [<f826597e>] snd_mpu401_uart_new+0x2ee/0x340 [snd_mpu401_uart] [ 22.210362] [<f8281154>] snd_mpu401_create+0x117/0x14f [snd_mpu401] [ 22.210365] [<f8281284>] ? snd_mpu401_probe+0x8c/0x8c [snd_mpu401] [ 22.210368] [<f8281284>] ? snd_mpu401_probe+0x8c/0x8c [snd_mpu401] [ 22.210371] [<f8281429>] snd_mpu401_pnp_probe+0x1a5/0x1ad [snd_mpu401] [ 22.210375] [<f8281284>] ? snd_mpu401_probe+0x8c/0x8c [snd_mpu401] [ 22.210379] [<c1324e59>] pnp_device_probe+0x59/0xd0 [ 22.210383] [<c136a138>] driver_probe_device+0x68/0x1e0 [ 22.210386] [<c1324de1>] ? match_device.isra.1+0x31/0x50 [ 22.210389] [<c136a341>] __driver_attach+0x91/0xa0 [ 22.210391] [<c136a2b0>] ? driver_probe_device+0x1e0/0x1e0 [ 22.210394] [<c1368a42>] bus_for_each_dev+0x42/0x70 [ 22.210396] [<c1369d11>] driver_attach+0x21/0x30 [ 22.210399] [<c136a2b0>] ? driver_probe_device+0x1e0/0x1e0 [ 22.210401] [<c1369977>] bus_add_driver+0x187/0x260 [ 22.210404] [<c1324c40>] ? pnp_device_detach+0x40/0x40 [ 22.210407] [<c136a7d6>] driver_register+0x66/0x110 [ 22.210410] [<c1324bfc>] pnp_register_driver+0x1c/0x20 [ 22.210413] [<f80640b0>] alsa_card_mpu401_init+0xb0/0x1000 [snd_mpu401] [ 22.210417] [<f8064000>] ? 0xf8063fff [ 22.210420] [<c1001114>] do_one_initcall+0x34/0x170 [ 22.210422] [<f8064000>] ? 0xf8063fff [ 22.210426] [<c108a940>] sys_init_module+0x2c0/0x1ae0 [ 22.210432] [<c155e61f>] sysenter_do_call+0x12/0x28 [ 22.210434] ---[ end trace 524a7b1977170492 ]---
The syslog is because of ramdisk broken with modifies of Linux Mint 12. But sound also failed if clean kernel. I was not seen syslog of errors while it.
The uart401 driver mishandles filing to register. I don't think that is related to your other sound problem but its a trivial fix in itself so I'll get it queued up.
The kernel warning is due to the missing initialization of irq field in mpu401_uart driver. This should be fixed by the patch below. However, the original issue, the missing sound, is irrelevant with this warning. It's more about the broken pin-configuration of HD-audio by BIOS.
Created attachment 75931 [details] Fix patch for kernel warning wrt mpu401
A patch referencing this bug report has been merged in Linux v3.6-rc1: commit bc733d495267a23ef8660220d696c6e549ce30b3 Author: Takashi Iwai <tiwai@suse.de> Date: Mon Jul 23 11:35:55 2012 +0200 ALSA: mpu401: Fix missing initialization of irq field