Am 31.01.2013 16:39, schrieb Yuri K. Shatroff: > Hello gentoo-users, > > I've got a Samsung laptop with Intel HDA sound card (Realtek ALC269VB ) > Yesterday I updated software (it was about a month old; I did a > eix-sync and emerge -Du @world) and somehow sound disappeared: the > kernel module (snd-hda-intel) still loads and the devices get detected > (the aforementioned Realtek codec and HDMI codecs). alsa-mixer also > seems to function. At least, it shows the sound card and allows to > change volume levels. (in /sys there are also entries for sound/card0) > But in KDE, the Kmix complains of the device not working, mpg123 says > cannot find card 0, etc. > Before the update, everything worked, the kernel version was 3.7.0. I > even installed kernels 3.7.4, 3.6.11, with many combinations of > HDA-related options and module parameters, all in vain, now I > installed 3.7.4 with ultra-verbose DEBUG enabled for ALSA and that's > what I'm getting: > > === BEGIN /var/log/messages === > snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X > ALSA sound/pci/hda/hda_intel.c:3150 chipset global capabilities = 0x4401 > ALSA.... (many similar messages) > input: HDA Intel MID Mic as > /devices/pci0000:00/0000:00:1b.0/sound/card0/input8 > input: HDA Intel MID Headphone as > /devices/pci0000:00/0000:00:1b.0/sound/card0/input9 > BUG: unable to handle kernel NULL pointer dereference at 0000000000000005 > IP: [<ffffffff811dd420>] strcmp+0x10/0x30 > PGD 119028067 PUD 119029067 PMD 0 > Oops: 0000 [#1] PREEMPT SMP > ...(registers dump)... > Call Trace: > [<ffffffffa00473d6>] card_id_ok.part.5+0x46/0x80 [snd] > [<ffffffffa00475fb>] snd_card_set_id_no_lock+0xeb/0x150 [snd] > [<ffffffffa0047725>] snd_card_register+0xc5/0x290 [snd] > [<ffffffffa0138a29>] azx_probe_continue+0xa4/0x159 [snd_hda_intel] > [<ffffffffa0138e81>] azx_probe+0xd9/0x116 [snd_hda_intel] > [<ffffffff811fb319>] pci_device_probe+0x79/0xb0 > [<ffffffff8126aa4a>] ? driver_sysfs_add+0x7a/0xb0 > [<ffffffff8126abdc>] really_probe+0x5c/0x210 > [<ffffffff8126ae9d>] driver_probe_device+0x1d/0x20 > [<ffffffff8126af3b>] __driver_attach+0x9b/0xa0 > [<ffffffff8126aea0>] ? driver_probe_device+0x20/0x20 > [<ffffffff8126922e>] bus_for_each_dev+0x4e/0x80 > [<ffffffff8126a859>] driver_attach+0x19/0x20 > [<ffffffff8126a410>] bus_add_driver+0x180/0x270 > [<ffffffffa010c000>] ? 0xffffffffa010bfff > [<ffffffff8126b455>] driver_register+0x75/0x150 > [<ffffffffa010c000>] ? 0xffffffffa010bfff > [<ffffffff811fa3b3>] __pci_register_driver+0x43/0x50 > [<ffffffffa010c01e>] azx_driver_init+0x1e/0x1000 [snd_hda_intel] > [<ffffffff810001fa>] do_one_initcall+0x3a/0x160 > [<ffffffff81088bf9>] sys_init_module+0xb9/0x220 > [<ffffffff813bf392>] system_call_fastpath+0x16/0x1b > ... > ---[ end trace d00fdb0cd6665b52 ]--- > === END /var/log/messages === > > As one can see, the line > > BUG: unable to handle kernel NULL pointer dereference > indicates a bug, doesn't it?
congratulation, you found a kernel bug. > > If it is a bug, what should I do? depends. Gentoo sources? Go to bugs.gentoo.org. Vanilla sources? lkml
