Last night I was installing the binary version of VirtualBox using equo:
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# equo install app-emulation/virtualbox-bin-1.5.2 app-emulation/virtualbox-modules-1.5.2-r1
A lot of packages were downloaded, including the sources for the 2.5.23 kernel....
I was able to start VirtualBox binary ed. with USB support, until I restarted X

Apparently, the nVIDIA driver version equo installed isn't compatible with the one I was using, look at my dmesg:
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dmesg:
[ 34.208656] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 100.14.19 Wed Sep 12 14:08:38 PDT 2007
[ 61.674245] NVRM: API mismatch: the client has the version 169.07, but
[ 61.674247] NVRM: this kernel module has the version 100.14.19. Please
[ 61.674249] NVRM: make sure that this kernel module and all NVIDIA driver
[ 61.674251] NVRM: components have the same version.
Apparently the 'client' (user space, maybe?) driver was updated but it has API inconsistencies with the one loaded by the kernel... I thought the driver was going to be rebuilded or something like that, but no...
Do I have to build it?
Do I have to recompile my kernel for that driver v. 169.07 to work?
I really would prefer to keep using the 100.14.19 driver. It was stable for me ...and I had X !!!
Here I copy some extra info:
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$ eix nvidia
* media-gfx/nvidia-cg-toolkit
Available versions: 1.5.0 (~)1.5.0023 (~)2.0.0010
Homepage: http://developer.nvidia.com/object/cg_toolkit.html
Description: nvidia's c graphics compiler toolkit
[U] media-video/nvidia-settings
Available versions: 1.0.20070621 (~)169.04 (~)169.07
Installed versions: 1.0.20070302(11:54:23 12/01/08)
Homepage: http://www.nvidia.com/
Description: NVIDIA Linux X11 Settings Utility
[U] x11-drivers/nvidia-drivers
Available versions: (~)1.0.9626-r99[3] (~)1.0.9629-r90[3] (~)1.0.9631-r90[3] (~)1.0.9631-r91[3] (~)1.0.9631-r92[3] (~)1.0.9639-r90[3] (~)1.0.9742-r90[3] (~)1.0.9746-r90[3] (~)1.0.9755-r10[3] 71.86.01 (~)71.86.01-r10[3] 96.43.01 (~)96.43.01-r10[3] 100.14.09 (~)100.14.09-r10[3] (~)100.14.11
(~)100.14.11-r10[3] (~)100.14.11-r11[3] 100.14.19 (~)100.14.19-r11[3] [M](~)100.14.23 [M](~)100.14.23-r10[3] (~)169.04-r10[3] [M](~)169.07 [M](~)169.07[1] (~)169.07-r10[3]
Installed versions: 100.14.19(11:54:26 12/01/08)(acpi gtk kernel_linux -multilib)
169.07-r10[sabayon](03:53:43 27/01/08)(acpi distribution kernel_linux -gtk -multilib)
Homepage: http://www.nvidia.com/
Description: NVIDIA X11 driver and GLX libraries
* x11-themes/nvidia [2]
Available versions: *1.0
Homepage: http://www.kde-look.org/content/show.php?content=12330
Description: A native KWin window decoration for KDE 3.x.
[1] (layman/arcon)
[2] (layman/gentoo-de)
[3] (layman/sabayon)
Found 4 matches.
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$ sudo equo search nvidia
>> @@ Searching...
>> #1 Sabayon Linux Official Repository
>> @@ Package: media-video/nvidia-settings-1.0.20070621 branch: 3.5
>> Category: media-video
>> Name: nvidia-settings
>> Available: version: 1.0.20070621 ~ tag: NoTag ~ revision: 1
>> Installed: version: 1.0.20070302 ~ tag: NoTag ~ revision: 9999
>> Slot: 0
>> Size: 0.7MB
>> Download: packages/amd64/3.5/nvidia-settings-1.0.20070621.tbz2
>> Checksum: 13f063824d801ddcd3313b6449105cc8
>> ## Dependencies:
>> ## >=x11-libs/gtk+-2
>> ## x11-libs/libXt
>> ## x11-drivers/nvidia-drivers
>> ## x11-base/xorg-server
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA Linux X11 Settings Utility
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 ~x86-fbsd -*
>> Created: 2007-09-19 16:55:08
>> License: GPL-2
>> @@ Package: x11-drivers/nvidia-drivers-100.14.19#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 100.14.19 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 9.9MB
>> Download: packages/amd64/3.5/nvidia-drivers-100.14.19#2.6.23-sabayon-r1~1.tbz2
>> Checksum: 5570deefb252b0f6aeb36425190cd770
>> ## Dependencies:
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## x11-base/xorg-server
>> ## media-libs/mesa
>> ## sys-power/acpid
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~x86-fbsd amd64 x86 -*
>> Created: 2007-12-10 14:41:08
>> License: NVIDIA
>> @@ Package: x11-drivers/nvidia-drivers-169.07-r10#2.6.23-sabayon-r1 branch: 3.5
>> @@ Package: x11-drivers/nvidia-drivers-169.07-r10#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 13.4MB
>> Download: packages/amd64/3.5/nvidia-drivers-169.07-r10#2.6.23-sabayon-r1~1.tbz2
>> Checksum: 8d5addd92256620380c9eacb16d4bfeb
>> ## Dependencies:
>> ## app-admin/eselect-opengl
>> ## media-libs/mesa
>> ## x11-base/xorg-server
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## sys-power/acpid
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 -*
>> Created: 2007-12-21 08:03:04
>> License: NVIDIA
>> @@ Package: x11-drivers/nvidia-drivers-100.14.23-r10#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 100.14.23-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 0
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 11.7MB
>> Download: packages/amd64/3.5/nvidia-drivers-100.14.23-r10#2.6.23-sabayon-r1~0.tbz2
>> Checksum: efabd66298b227a837e610afd1d20697
>> ## Dependencies:
>> ## app-admin/eselect-opengl
>> ## media-libs/mesa
>> ## x11-base/xorg-server
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## sys-power/acpid
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 -*
>> Created: 2007-12-21 08:12:15
>> License: NVIDIA
>> @@ Package: x11-drivers/nvidia-drivers-100.14.19-r11#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 100.14.19-r11 ~ tag: 2.6.23-sabayon-r1 ~ revision: 0
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 11.8MB
>> Download: packages/amd64/3.5/nvidia-drivers-100.14.19-r11#2.6.23-sabayon-r1~0.tbz2
>> Checksum: 1960a80570d6440eb0089615b691e7eb
>> ## Dependencies:
>> ## app-admin/eselect-opengl
>> ## media-libs/mesa
>> ## x11-base/xorg-server
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## sys-power/acpid
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 -*
>> Created: 2007-12-21 15:21:05
>> License: NVIDIA
>> @@ Package: x11-drivers/nvidia-drivers-71.86.01-r10#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 71.86.01-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 5.8MB
>> Download: packages/amd64/3.5/nvidia-drivers-71.86.01-r10#2.6.23-sabayon-r1~1.tbz2
>> Checksum: f8bd4ce19983c18bff929769e1e083d4
>> ## Dependencies:
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## app-admin/eselect-opengl
>> ## x11-base/xorg-server
>> ## media-libs/mesa
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 ~x86-fbsd -*
>> Created: 2007-12-21 15:11:59
>> License: NVIDIA
>> @@ Package: x11-drivers/nvidia-drivers-96.43.01-r10#2.6.23-sabayon-r1 branch: 3.5
>> Category: x11-drivers
>> Name: nvidia-drivers
>> Available: version: 96.43.01-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Installed: version: 169.07-r10 ~ tag: 2.6.23-sabayon-r1 ~ revision: 1
>> Slot: 2.6.23-sabayon-r1
>> Size: 7.3MB
>> Download: packages/amd64/3.5/nvidia-drivers-96.43.01-r10#2.6.23-sabayon-r1~1.tbz2
>> Checksum: 991c80c9a0cdac7d16a67504d77f4920
>> ## Dependencies:
>> ## =sys-kernel/linux-sabayon-2.6.23-r1
>> ## app-admin/eselect-opengl
>> ## x11-base/xorg-server
>> ## media-libs/mesa
>> ## virtual/modutils
>> ## Conflicts:
>> ## app-emulation/emul-linux-x86-nvidia
>> ## x11-drivers/nvidia-legacy-drivers
>> Homepage: http://www.nvidia.com/
>> Description: NVIDIA X11 driver and GLX libraries
>> Compiled with: -Os -march=x86-64 -pipe
>> Keywords: ~amd64 ~x86 ~x86-fbsd -*
>> Created: 2007-12-21 15:13:31
>> License: NVIDIA
>> Keyword: nvidia
>> Found: 7 entries