Martin, thanks for raising this as a bug. Folks, there have been many comments about this issue in the forums, including mine at:
http://ubuntuforums.org/showthread.php?t=1486446 with several workaround suggestions, some of which work for some people, some of the time! On my gear (see 1486446) the noise is a horrible banging and crackling, sometimes for 10-30 seconds after the PC has shutdown. It seems to me as though the gradual decay of the PSU's capacitors causes electrical noise, which is then amplified by the still-on amplifier. Yes I could first turn off the amplifier, but I want to shutdown remotely,whle I am near but not at the machine. Note that this problem NEVER occurs using the same HW under WXP MCE. It seems likely that Windows shut down routines must be doing some sort of turn off at the sound card prior to shut down, and Ubuntu isn't! This has been experienced by me with 9.04 Jaunty, 9.10 Karmic, and now 10.04 Lucid. I think I have tried both 32 and 64 bit in the past, but am now on Lucid 64. Interestingly, my 9.04 Toshiba Satellite A10 laptop has never made those noises on turning off, and shows "shutting down ALSA" late in the shutdown sequence (quiet and splash removed). (I have not moved that to 10.04 yet because of the Intel 855GM bugs.) I look forward to requests for tests to try or diagnostics to perform. Spelling them out 'for the dummy' would be appreciated! I'm not bad, but no guru! -- [IDT 92HD75B3X5] Cracking noise on shutdown https://bugs.launchpad.net/bugs/578566 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
