memory test went fine. All pass. Trying to run bumblebee ends with the following message in the syslog: Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.445420] bbswitch: version 0.8 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.445434] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.445446] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.P0P1.PEGP Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.445468] ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.445844] ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.446213] bbswitch: detected a nVidia _DSM function Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.446326] pci 0000:01:00.0: enabling device (0000 -> 0003) Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.446479] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on Jun 9 23:07:02 sayantan-Vostro-3300 bumblebeed[28797]: /usr/sbin/bumblebeed 3.2.1 started Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.451481] bbswitch: disabling discrete graphics Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.467150] ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.474302] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=none,decodes=io+mem:owns=none Jun 9 23:07:02 sayantan-Vostro-3300 acpid: input device has been disconnected, fd 8 Jun 9 23:07:02 sayantan-Vostro-3300 acpid: input device has been disconnected, fd 9 Jun 9 23:07:02 sayantan-Vostro-3300 acpid: input device has been disconnected, fd 10 Jun 9 23:07:02 sayantan-Vostro-3300 acpid: input device has been disconnected, fd 11 Jun 9 23:07:02 sayantan-Vostro-3300 acpid: input device has been disconnected, fd 16 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579399] ------------[ cut here ]------------ Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579417] WARNING: CPU: 0 PID: 4 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579421] sysfs group ffffffff81cab9c0 not found for kobject 'acpi_video0' Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579424] Modules linked in: bbswitch(OF) pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) ctr ccm bnep rfcomm bluetooth binfmt_misc snd_hda_codec_hdmi snd_hda_codec_idt arc4 brcmsmac cordic brcmutil b43 mac80211 uvcvideo cfg80211 ssb videobuf2_vmalloc videobuf2_memops dell_wmi sparse_keymap videobuf2_core mxm_wmi intel_powerclamp videodev snd_hda_intel snd_hda_codec snd_hwdep coretemp i915 snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi kvm_intel snd_seq snd_seq_device kvm drm_kms_helper drm snd_timer dell_laptop joydev dcdbas i2c_algo_bit serio_raw lpc_ich bcma snd mei_me intel_ips soundcore mei wmi video mac_hid parport_pc ppdev lp parport psmouse ahci r8169 libahci mii Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579537] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: GF O 3.13.0-29-generic #53-Ubuntu Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579541] Hardware name: Dell Inc. Vostro 3300/07JC8T, BIOS A10 10/25/2010 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579551] Workqueue: kacpi_hotplug acpi_hotplug_work_fn Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579555] 0000000000000009 ffff880240175ac8 ffffffff8171a214 ffff880240175b10 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579564] ffff880240175b00 ffffffff810676bd 0000000000000000 ffffffff81cab9c0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579571] ffff88023c04b4a8 ffff88023fd58098 ffff8802402afc08 ffff880240175b60 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579579] Call Trace: Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579592] [] dump_stack+0x45/0x56 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579599] [] warn_slowpath_common+0x7d/0xa0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579604] [] warn_slowpath_fmt+0x4c/0x50 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579610] [] ? sysfs_get_dirent_ns+0x4e/0x70 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579614] [] sysfs_remove_group+0xc6/0xd0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579623] [] dpm_sysfs_remove+0x43/0x50 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579629] [] device_del+0x45/0x1c0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579633] [] device_unregister+0x1e/0x60 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579640] [] backlight_device_unregister+0x98/0xa0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579651] [] acpi_video_bus_remove+0xd8/0x1d9 [video] Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579659] [] acpi_device_remove+0x80/0x9f Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579666] [] __device_release_driver+0x7f/0xf0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579671] [] device_release_driver+0x23/0x30 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579677] [] acpi_bus_device_detach+0x57/0x5b Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579682] [] acpi_bus_trim+0x3f/0x74 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579689] [] acpiphp_bus_trim+0x2c/0x30 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579694] [] disable_slot+0xaa/0xd0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579699] [] acpiphp_check_bridge+0x118/0x120 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579704] [] hotplug_event+0x117/0x260 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579710] [] hotplug_event_work+0x2a/0x70 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579714] [] acpi_hotplug_work_fn+0x1c/0x27 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579721] [] process_one_work+0x182/0x450 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579726] [] worker_thread+0x121/0x410 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579731] [] ? rescuer_thread+0x3e0/0x3e0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579737] [] kthread+0xd2/0xf0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579742] [] ? kthread_create_on_node+0x1d0/0x1d0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579749] [] ret_from_fork+0x7c/0xb0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579754] [] ? kthread_create_on_node+0x1d0/0x1d0 Jun 9 23:07:02 sayantan-Vostro-3300 kernel: [ 1795.579757] ---[ end trace 8a072e397aed6c64 ]---