gpu-manager systemd unit is not enabled

sudo systemctl status gpu-manager.service
● gpu-manager.service - Detect the available GPUs and deal with any system changes
   Loaded: loaded (/lib/systemd/system/gpu-manager.service; disabled; vendor preset: enabled)
   Active: inactive (dead)

The unit did not run at all during boot on your system, it appears the unit isn't enabled. Do you actually have a /etc/systemd/system/display-manager.service.wants/gpu-manager.service symlink?

It is enabled on my laptop, and ran fine (it didn't do anything of course as I have a single intel card).

Ah, indeed /var/lib/dpkg/info/ubuntu-drivers-common.postinst has no unit enablement code at all. I suspect the conditional code in debian/rules which is supposed to call this stopped working:

        # on architectures where we build gpu-manager, install the systemd unit
        if [ -d debian/tmp/lib/systemd ]; then \
                dh_systemd_enable; \
                dh_install -p ubuntu-drivers-common lib/systemd; \
        fi

indeed the build log shows:

Can't stat debian/nvidia-common: No such file or directory
 at /usr/bin/dh_systemd_enable line 180.
Can't stat debian/fglrx-pxpress: No such file or directory
 at /usr/bin/dh_systemd_enable line 180.

ok, it makes sense now.

I've just rebuilt u-d-c using your latest commits, and it works well now:

:~$ sudo systemctl status gpu-manager.service
● gpu-manager.service - Detect the available GPUs and deal with any system changes
   Loaded: loaded (/lib/systemd/system/gpu-manager.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since lun 2015-04-13 16:03:00 CEST; 1min 25s ago
  Process: 697 ExecStart=/usr/bin/gpu-manager --log /var/log/gpu-manager.log (code=exited, status=0/SUCCESS)
 Main PID: 697 (code=exited, status=0/SUCCESS)

Please make sure that the fix makes it into the 15.04 release. Thanks a lot for your help!

This bug was fixed in the package ubuntu-drivers-common - 1:0.4.5

---------------
ubuntu-drivers-common (1:0.4.5) vivid; urgency=medium

  * Call dh_systemd_enable after installing gpu-manager.service, so that the
    unit actually gets enabled. Also quiesce the confusing error messages
    about nonexisting binary package directories. (LP: #1443364)
 -- Martin Pitt <email address hidden> Mon, 13 Apr 2015 07:01:15 -0500

I'm experiencing this bug after upgrading from kubuntu 14.10 to 15.04 using the update manager.

Using nvidia-346:

Booting with a previous kernel (3.16) works but I'm stuck in intel mode.

Booting with current kernel (3.19) leaves me with the black screen which can be fixed (until restart) by running the suggested:
sudo systemctl stop sddm

sudo systemctl start gpu-manager

sudo systemctl start sddm

Idk if its relevant but

gpu-manager.conf :
start on (starting lightdm
          or starting gdm
          or starting kdm
          or starting xdm
          or starting lxdm)
task
exec gpu-manager --log /var/log/gpu-manager.log

Tried the obvious and added a line "or starting sddm" but didn't work :P

TigerShark, can you please give me the output of

  sudo systemctl status -l gpu-manager.service

directly after a clean boot? Note that /etc/init/gpu-manager.conf is not being used in systemd.

# systemctl status -l gpu-manager.service
● gpu-manager.service - Detect the available GPUs and deal with any system changes
   Loaded: loaded (/lib/systemd/system/gpu-manager.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Thu 2016-09-15 16:34:57 CEST; 3min 4s ago
  Process: 1950 ExecStart=/usr/bin/gpu-manager --log /var/log/gpu-manager.log (code=exited, status=0/SUCCESS)
 Main PID: 1950 (code=exited, status=0/SUCCESS)

Sep 15 16:34:57 *** gpu-manager[1950]: /etc/modprobe.d is not a file
Sep 15 16:34:57 *** gpu-manager[1950]: /etc/modprobe.d is not a file
Sep 15 16:34:57 *** gpu-manager[1950]: Error: can't open /lib/modules/4.4.0-38-generic/updates/dkms
Sep 15 16:34:57 *** gpu-manager[1950]: Error: can't open /lib/modules/4.4.0-38-generic/updates/dkms
Sep 15 16:34:57 *** gpu-manager[1950]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
Sep 15 16:34:57 *** systemd[1]: Started Detect the available GPUs and deal with any system changes.
Sep 15 16:34:57 *** systemd[1]: gpu-manager.service: Start request repeated too quickly.
Sep 15 16:34:57 *** systemd[1]: Failed to start Detect the available GPUs and deal with any system changes.
Sep 15 16:35:02 *** systemd[1]: gpu-manager.service: Start request repeated too quickly.
Sep 15 16:35:02 *** systemd[1]: Failed to start Detect the available GPUs and deal with any system changes.