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** No longer affects: ubuntu -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to alsa-lib in Ubuntu. https://bugs.launchpad.net/bugs/1895833 Title: unblock restrictions on alsa (max id of card and sample rate for alsa Loopback) Status in ALSA Libraries: New Status in Alsa utilities: New Status in alsa-lib package in Ubuntu: New Status in alsa-utils package in Ubuntu: New Bug description: SRU Justification: [Impact] kernel, alsa-lib, alsa-utils We are using more and more cards recognized as sound peripherals. When the number of loopback and hardware cards exceeds 32, we can no longer use them. Also some new devices are already using 384khz but the limitation is for alsa Loopback. I thinks we must increse CONFIG_SND_MAX_CARDS to 256 and change 192000 sample rate value fixed in aloop.c to 384000 or 768000 to provide an additional margin in alsa Loopback. [Test Case] sudo add-apt-repository -y universe apt-get update && sudo apt-get upgrade -y sudo apt-get install alsa alsa-* shutdown -r now sudo modprobe snd-aloop sudo echo snd-aloop >> /etc/modules sudo adduser $(whoami) audio shutdown -r now sudo apt-get install -y apt-get install alsa alsa-utils libasound2-dev sudo apt-get install -y screen build-essential initramfs-tools fakeroot debconf-utils dpkg-dev debhelper bin86 flex bison pkgconf dkms python3-docutils \ libudev-dev mt-st cpufrequtils libpci-dev libssl-dev libiberty-dev libcap-dev asciidoc default-jdk libncurses-dev \ kernel-package kernel-wedge libnvpair1linux libuutil1linux libzfs2linux libzpool2linux zfs-dkms zfs-zed zfsutils-linux \ crash makedumpfile libncurses5 libncurses5-dev libelf-dev binutils-dev kexec-tools screen mkdir ~/megamod cd ~/megamod git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git cd ubuntu-focal sed -i 's/SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,/SNDRV_PCM_RATE_CONTINUOUS,/g' ./sound/drivers/aloop.c sed -i 's/192000/768000/g' ./sound/drivers/aloop.c grep -rnl './' -e "CONFIG_SND_MAX_CARDS=32" | xargs -i@ sed -i 's/CONFIG_SND_MAX_CARDS=32/CONFIG_SND_MAX_CARDS=256/g' @ search and replace 32 by 256 in and ./debian.master/config/annotations for CONFIG_SND_MAX_CARDS fakeroot debian/rules clean fakeroot debian/rules binary dpkg -i ../linux*5.4.0-*.deb shutdown -r now sudo systemctl disable hv-kvp-daemon.service #################### echo "options snd-aloop \" >> /etc/modprobe.d/alsa-base.conf echo "index=10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45 \" >> /etc/modprobe.d/alsa-base.conf echo "id=lp0,lp1,lp2,lp3,lp4,lp5,lp6,lp7,lp8,lp9,lp10,lp11,lp12,lp13,lp14,lp15,lp16,lp17,lp18,lp19,lp20,lp21,lp22,lp23,lp24,lp25,lp26,lp27,lp28,lp29,lp30,lp31,lp32,lp33,lp34,lp35 \" >> /etc/modprobe.d/alsa-base.conf echo "enable=1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 \" >> /etc/modprobe.d/alsa-base.conf echo "pcm_substreams=2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2" >> /etc/modprobe.d/alsa-base.conf sudo su sudo mkdir /usr/src/alsa cd /usr/src/alsa git clone git://git.alsa-project.org/alsa-lib.git alsa-lib cd /usr/src/alsa/alsa-lib ./gitcompile --with-max-cards=256 make install cp /usr/lib/libasound* /usr/lib/x86_64-linux-gnu/ cd /usr/src/alsa git clone git://git.alsa-project.org/alsa-utils.git alsa-utils cd /usr/src/alsa/alsa-utils ./gitcompile --with-max-cards=256 make install shutdown -r now [Regression Potential] * The regression can be considered as low, because this is because it's functional since 16.04 [Other] * This requires a patch to be included into the kernel, alsa-lib and alsa-utils package. - please see [Test Case] description for more details. * changes can be made independently and have no impact on others [Patch] In /sound/drivers/aloop.c: L555 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, to L555 .rates = SNDRV_PCM_RATE_CONTINUOUS, In /sound/drivers/aloop.c: L557 .rate_max = 192000, to L557 .rate_max = 768000, In /sound/drivers/aloop.c: L557 uinfo->value.integer.max = 192000; to L557 uinfo->value.integer.max = 768000; In /debian.master/config/config.common.ubuntu L9069 CONFIG_SND_MAX_CARDS=32 to L9069 CONFIG_SND_MAX_CARDS=256 and update debian.master/rules.d/hooks.mk For alsa-lib and alsa-util, package can be simply update with ./gitcompile --with-max-cards=256 Thanks everybody To manage notifications about this bug go to: https://bugs.launchpad.net/alsa-lib/+bug/1895833/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
