I didn't open the bug, and anyway I've found in my dmesg that there is an entry systemd related (but I've never switched to systemd), and further some acpi errors.
5.629507] ACPI Warning: 0x0000000000000b00-0x0000000000000b07 SystemIO conflicts with Region \_SB_.PCI0.SBRG.ASOC.SMRG 1 (20130117/utaddress-251)
[ 5.629513] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 5.629519] checking generic (d0000000 180000) vs hw (d0000000 10000000)
[ 5.629521] fb: conflicting fb hw usage radeondrmfb vs VESA VGA - removing generic driver
[ 4.966416] systemd-udevd: starting version 202
I did not paste the whole dmesg because I think everything but this is OK