Bug#908005: nvidia-driver: When initializing vulkan, driver opens default XDisplay

Luca Boccassi bluca at debian.org
Fri Sep 7 11:27:36 BST 2018

Control: reassign -1 bumblebee
Control: forcemerge 892646 -1

On Wed, 2018-09-05 at 06:52 +0200, Felix Dörre wrote:
> Package: nvidia-driver
> Version: 390.77-1
> Severity: important
> Dear Maintainer,
> I have an Nvidia-Optimus setup and use bumblebee to activate the
> Nvidia GPU on demand.
> When I use libvulkan.so.1 to run a Vulkan application the ICD from
> Nvidia (installed in /usr/share/vulkan/icd.d/nvidia_icd.json,
> /usr/lib/x86_64-linux-gnu/nvidia/libGL.so.1) opens a connection to
> the
> default X Display (as specified by the DISPLAY environment variable).
> When using bumblebee to activate the Nvidia GPU, the driver must
> connect to Display :8, where bumblebee runs the secondary
> X Server. However I want to run my application with the DISPLAY
> environment variable set to :0 (as I want it displayed on :0).
> I generally would expect the Vulkan-Nvidia driver not to require an
> X-connection when doing headless rendering and for 'normal' rendering
> use the X-connection/display that is indicated by the surface-
> creation functions, and not choose one by itself on startup.
> If that is hard to achieve, I would at least expext the Nvidia-Driver 
> to have some override environment variable (like e.g. NV_DISPLAY)
> that, when set, is passed by the Nvidia-Driver to XOpenDisplay, that
> "normal" applications would ignore.

Hi, Vulkan is not supported on Optimus, see #892646.

Kind regards,
Luca Boccassi
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