Just wanted to let you guys know that if you disable the sound
notifications (system settings -> application and system notifications)
the CPU consumption seems to go away. Running an strace on knotify4
reveals the following. Note that this is strace is done on Arch Linux
and not on Ubuntu.
stat("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=9030, ...}) = 0
open("/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10100) = 0
close(24) = 0
open("/dev/snd/controlC0", O_RDWR|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_PVERSION or USBDEVFS_CONTROL or USBDEVFS_CONTROL32,
0x7fff04d1046c) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10450) = 0
close(24) = 0
open("/etc/group", O_RDONLY|O_CLOEXEC) = 24
fstat(24, {st_mode=S_IFREG|0644, st_size=642, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f8dad020000
read(24, "root:x:0:root\nbin:x:1:root,bin,d"..., 4096) = 642
close(24) = 0
munmap(0x7f8dad020000, 4096) = 0
open("/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d102a0) = 0
close(24) = 0
semget(0x56a4d5, 1, IPC_CREAT|0660) = 100335616
semctl(100335616, 0, IPC_STAT, 0x7fff04d10690) = 0
semctl(100335616, 0, IPC_SET, 0x7fff04d10690) = 0
semop(100335616, {{0, 0, 0}, {0, 1, SEM_UNDO}}, 2) = 0
shmget(0x56a4d5, 488, IPC_CREAT|0660) = 622592
shmat(622592, 0, 0) = ?
mlock(0x7f8dad020000, 488) = 0
shmctl(622592, IPC_STAT, 0x7fff04d10680) = 0
open("/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10180) = 0
close(24) = 0
open("/dev/snd/controlC0", O_RDWR|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_PVERSION or USBDEVFS_CONTROL or USBDEVFS_CONTROL32,
0x7fff04d1033c) = 0
ioctl(24, SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE, 0x7fff04d1035c) = 0
open("/dev/snd/pcmC0D0p", O_RDWR|O_APPEND|O_NONBLOCK|O_CLOEXEC) = -1 EINVAL
(Invalid argument)
close(24) = 0
shmdt(0) = -1 EINVAL (Invalid argument)
shmdt(0x7f8dad020000) = 0
shmctl(622592, IPC_STAT, 0x7fff04d10690) = 0
semctl(100335616, 0, IPC_RMID, 0) = 0
read(8, 0x1a2dfe4, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=8, events=POLLIN}, {fd=10, events=POLLIN},
{fd=12, events=POLLIN}, {fd=5, events=POLLIN}], 5, 0) = 0 (Timeout)
read(8, 0x1a2dfe4, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
stat("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=9030, ...}) = 0
open("/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10290) = 0
close(24) = 0
stat("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=9030, ...}) = 0
open("/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10100) = 0
close(24) = 0
open("/dev/snd/controlC0", O_RDWR|O_CLOEXEC) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
ioctl(24, SNDRV_CTL_IOCTL_PVERSION or USBDEVFS_CONTROL or USBDEVFS_CONTROL32,
0x7fff04d1046c) = 0
ioctl(24, SNDRV_CTL_IOCTL_CARD_INFO or UI_DEV_CREATE, 0x7fff04d10450) = 0
close(24) = 0
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https://bugs.launchpad.net/bugs/768714
Title:
kded4 and knotify4 eats 100% cpu
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