strace shows:
open("/var/lib/NetworkManager/timestamps", O_RDONLY) = 20
fstat(20, {st_mode=S_IFREG|0644, st_size=1646, ...}) = 0
read(20, "\n[timestamps]\n3c32aa58-a2ed-44e7"..., 4096) = 1646
read(20, "", 4096) = 0
close(20) = 0
open("/var/lib/NetworkManager/timestamps.EB5H7V", O_RDWR|O_CREAT|O_EXCL, 0666)
= 20
fcntl(20, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
fstat(20, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f04b964c000
lseek(20, 0, SEEK_CUR) = 0
write(20, "\n[timestamps]\n3c32aa58-a2ed-44e7"..., 1646) = 1646
fstatfs(20, {f_type="EXT2_SUPER_MAGIC", f_bsize=4096, f_blocks=7874279,
f_bfree=5238919, f_bavail=4838919, f_files=2003120, f_ffree=1658729,
f_fsid={-1107732364, 115902444}, f_namelen=255, f_frsize=4096}) = 0
lstat("/var/lib/NetworkManager/timestamps", {st_mode=S_IFREG|0644,
st_size=1646, ...}) = 0
fsync(20) = 0
close(20) = 0
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https://bugs.launchpad.net/bugs/913856
Title:
NetworkManager periodically writes to the disk causing wakeups
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