Arch Linux

helskor

Member

From: Berlin/Germany

Registered: 2012-09-03

Posts: 5

[SOLVED] Problems with systemd service for disabling the discrete GPU

Hey,

I tried to poweroff the discrete GPU of my MacBook 10,1 at startup. I created this systemd service:

# /etc/systemd/system/disablegpu.service

[Unit]
Description=DisableGPU
Requires=sys-kernel-debug.mount
After=sys-kernel-debug.mount

[Service]
Type=oneshot
ExecStart=/bin/sh -c "echo OFF > /sys/kernel/debug/vgaswitcheroo/switch"

[Install]
WantedBy=multi-user.target

and enabled it with "systemctl enable disablegpu.service". I get this error after startup:

disablegpu.service - DisableGPU
   Loaded: loaded (/etc/systemd/system/disablegpu.service; enabled)
   Active: failed (Result: exit-code) since Mi 2014-05-07 13:31:14 CEST; 11min ago
  Process: 280 ExecStart=/bin/sh -c echo OFF > /sys/kernel/debug/vgaswitcheroo/switch (code=exited, status=1/FAILURE)
 Main PID: 280 (code=exited, status=1/FAILURE)

Mai 07 13:31:14 macbook sh[280]: /bin/sh: /sys/kernel/debug/vgaswitcheroo/switch: file or directory not found
Mai 07 13:31:14 macbook systemd[1]: disablegpu.service: main process exited, code=exited, status=1/FAILURE
Mai 07 13:31:16 macbook systemd[1]: Failed to start DisableGPU.
Mai 07 13:31:16 macbook systemd[1]: Unit disablegpu.service entered failed state.

When I try to start it afterwards with "systemctl start disablegpu.service", it works.

Any ideas?

Thanks,

Felix

EDIT:

Enabled early KMS start and now it works.

Last edited by helskor (2014-05-08 06:40:56)