No hybrid GPU and this error appears: Failed to spawn hybrid-gfx main process: unable to execute: No such file or directory

[frankster]

I have an nVidia 9800GT GPU and a Core 2 Duo CPU. Still, I get errors during startup:

32.281097] init: Failed to spawn hybrid-gfx main process: unable to execute: No such file or director

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-drivers-common 1:0.2.91.6
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
Date: Fri Sep 5 18:31:30 2014
InstallationDate: Installed on 2012-03-26 (892 days ago)
InstallationMedia: Mythbuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: ubuntu-drivers-common
UpgradeStatus: Upgraded to trusty on 2014-07-20 (47 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[exit_jones (furiajusta)]

also a Dell Studio XPS 9100 (with an Intel i7-930 quadcore) and an Nvidia GeForce 9800 GT, upgraded today from 12.04 --> 14.04

at the end of dmesg from startup:
[ 17.577900] init: Failed to spawn hybrid-gfx main process: unable to execute: No such file or directory
[ 17.769747] init: gdm main process (1182) killed by TERM signal

here's some info on the video card:
root@desktop-of-my-boss:/var/log# lspci -knns 03:00.0
03:00.0 VGA compatible controller [0300]: NVIDIA Corporation G92 [GeForce 9800 GT] [10de:0605] (rev a2)
 Subsystem: XFX Pine Group Inc. Device [1682:2372]
 Kernel driver in use: nvidia

[Lothar Fausthenze (fausthenze)]

I am also affected after upgrading from 12.04.5 to 14.04.1.

My system's facts sheet is as follows:

 - Lenovo T410i
 - Linux ubuntu 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
 - NVIDIA Corporation GT218M [NVS 3100M] (rev a2) (prog-if 00 [VGA controller])

Error log in /var/log/syslog contains at least the following messages:

init: Failed to spawn hybrid-gfx main process: unable to execute: No such file or directory
init: nvidia-prime main process (…) terminated with status 127
init: lightdm main process terminated with status 1
init: plymouth-ready (startup) main process (…) terminated with status 1
init: failsafe-x main process (…) terminated with status 127

The greeter won't show up, lightdm fails to start automatically and manually (via sudo service lightdm start) respectively.

[rewound (rewound)]

Whilst attempting to debug bug #781977 $dmesg was found to contain...
"init: Failed to spawn hybrid-gfx main process: unable to execute: No such file or directory" ie bug #1366165
HP Compaq nx6325 running Ubuntu 14.04.1 LTS (trusty), Kernel is 3.13.0-44-generic
From $sudo lshw...

           *-display
                description: VGA compatible controller
                product: RS482M [Mobility Radeon Xpress 200]
                vendor: Advanced Micro Devices, Inc. [AMD/ATI]
                physical id: 5
                bus info: pci@0000:01:05.0
                version: 00
                width: 32 bits
                clock: 66MHz
                capabilities: pm vga_controller bus_master cap_list rom
                configuration: driver=radeon latency=64 mingnt=8
                resources: irq:17 memory:c0000000-c7ffffff ioport:6000(size=256) memory:d4300000-d430ffff memory:d4320000-d433ffff

from line: configuration: driver=radeon...

$ modinfo radeon (output reduced to save space)
filename: /lib/modules/3.13.0-44-generic/kernel/drivers/gpu/drm/radeon/radeon.ko
license: GPL and additional rights
description: ATI Radeon
author: Gareth Hughes, Keith Whitwell, others.
depends: drm,drm_kms_helper,ttm,i2c-algo-bit
intree: Y
vermagic: 3.13.0-44-generic SMP mod_unload modversions 686

Is it looking for a file or a directory and what is the name of the missing item? What are ramifications when not found?
Otherwise Xubuntu/Peppermint/Trusty on this laptop runs nicely apart from bug #781977 when a suspend works only once.

[Brad Parker (cbparker)]

I have the same problem on my work PC. Any time my monitor is put to sleep for inactivity, the video signal never returns within X. After the inactivity, I turn the monitor back on after it has shut off due to no signal, and moving the mouse/typing keys will not bring the signal back, monitor just says no signal. If I press ctrl+alt+f1 then I get a console and the monitor comes back to life. I have to restart lightdm (killing all my programs) to get back into X. dmesg only shows the following:

[4219918.274807] init: tty1 main process ended, respawning
[4219923.733629] init: Failed to spawn hybrid-gfx main process: unable to execute: No such file or directory
[4219924.646159] nvidia 0000:01:00.0: irq 49 for MSI/MSI-X

[Brad Parker (cbparker)]

Forgot to mention, my system is an older i7-870 (no integrated graphics) with a GeForce GTX 650 Ti using nvidia 331.113 driver. Ubuntu 14.04 and 3.13.0-43-lowlatency kernel.