Bug#776874: systemd: system auto-resumes when pcspkr module is loaded

[Brain Slug]

Package: systemd
Version: 215-10
Severity: normal

Dear Maintainer,

I'm running Debian Jessie on a Dell M4800 mobile workstation. I recently switched from ALSA to Pulse audio (big mistake!).
Ever since, I was having trouble with suspending my laptop. The system would go to sleep, but after about three secons auto-resume.

After fiddling with this for some time, I noticed that after removing ALSA the pcspkr module was auto-loaded at boot. Removing
the module via rmmod allows the system to resume properly again. Re-inserting the module reproduces the problem, so I am fairly
sure that the pcspkr module is the culprit.

I blacklisted pcspkr in modprobe.d (like it is automatically done when using alsa) and I'm fine. Nonetheless, I thought I'd report this
to save someone else some debugging time, maybe.


Thanks!


-- Package-specific info:

-- System Information:
Debian Release: 8.0
  APT prefers testing
  APT policy: (700, 'testing'), (690, 'unstable'), (680, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  acl             2.2.52-2
ii  adduser         3.113+nmu3
ii  initscripts     2.88dsf-58
ii  libacl1         2.2.52-2
ii  libaudit1       1:2.4-1+b1
ii  libblkid1       2.25.2-4.1
ii  libc6           2.19-13
ii  libcap2         1:2.24-6
ii  libcap2-bin     1:2.24-6
ii  libcryptsetup4  2:1.6.6-4
ii  libgcrypt20     1.6.2-4+b1
ii  libkmod2        18-3
ii  liblzma5        5.1.1alpha+20120614-2+b3
ii  libpam0g        1.1.8-3.1
ii  libselinux1     2.3-2
ii  libsystemd0     215-10
ii  mount           2.25.2-4.1
ii  sysv-rc         2.88dsf-58
ii  udev            215-10
ii  util-linux      2.25.2-4.1

Versions of packages systemd recommends:
ii  dbus            1.8.12-3
ii  libpam-systemd  215-10

Versions of packages systemd suggests:
pn  systemd-ui  <none>

-- Configuration Files:
/etc/systemd/logind.conf changed [not included]

-- no debconf information