From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Georg C. F. Greve" Date: Mon, 27 Dec 2004 12:05:46 +0000 Subject: USB Headset: no sound / keyboard freeze, occasional kbd freeze or crash when unplugging Message-Id: MIME-Version: 1 Content-Type: multipart/mixed; boundary="20041227130547+0100-79623338-72224397-25818085" List-Id: To: linux-usb-devel@lists.sourceforge.net, alsa-devel@lists.sourceforge.net --20041227130547+0100-79623338-72224397-25818085 Hi all, sorry for the crossposting, but I am not sure whether this problem is USB or ALSA related, since the ALSA code *seems* to work just perfectly fine, but no sound ever comes out of the Headset, so it *may* be a transport layer problem. Got myself a Logitech USB Headset recently and tried to get it to work on my workplace machine & laptop. Both machines showed the same effects (running Kernel 2.6.9 initially and 2.6.10 now): Sound seems to work, ALSA claims everything is fine but no sound is ever audible. [*] Strangely, when first plugging it into the workplace machine, I could get it to work: the snd-usb-audio module of ALSA was missing, so I recompiled the kernel with that module and -- being too lazy -- did not reboot, but simply installed the new kernel on disk in place of the old one (which was still running) and loaded the module. Things worked perfectly then, as far as I could tell -- crystal clear sound, good recording. Only after rebooting into the kernel that had been recompiled along with the module did things stop working. When unplugging/replugging the headset trying to get it to work, I experienced strange phenomena: the keyboard would stop working, and once it didn't work when I booted the machine with the headset plugged in. In one case, I got a kernel crash reported to syslog. Unfortunately, I could not reproduce this with a debugging enabled kernel, so there is not much information, but what I had was filed as https://bugtrack.alsa-project.org/alsa-bug/view.php?id=745 and http://bugzilla.kernel.org/show_bug.cgi?id=3954 since I am not sure where the problem actually lies. If you need more info, please let me know. Regards, Georg [*] Yes, the mixer does work and are not muted/set to zero. -- Georg C. F. Greve Free Software Foundation Europe (http://fsfeurope.org) GNU Business Network (http://mailman.gnubiz.org) Brave GNU World (http://brave-gnu-world.org) --20041227130547+0100-79623338-72224397-25818085 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.3.92 (GNU/Linux) iD8DBQBBz/qbbvivwoZXSsoRAm0aAJ4us1C/x2Q59LEkMAXEnJ9G7BKiyACgs8xz UYsegtxfHlp8czQekhZL/Hw= =gVD0 -----END PGP SIGNATURE----- --20041227130547+0100-79623338-72224397-25818085--