078277e4d9
This is a modified version of a patch we've been carry-ing in Fedora and RHEL for years now. This patch automatically adds secondary GPUs to the master as output sink / offload source making e.g. the use of slave-outputs just work, with requiring the user to manually run "xrandr --setprovideroutputsource" before he can hookup an external monitor to his hybrid graphics laptop. There is one problem with this patch, which is why it was not upstreamed before. What to do when a secondary GPU gets detected really is a policy decission (e.g. one may want to autobind PCI GPUs but not USB ones) and as such should be under control of the Desktop Environment. Unconditionally adding autobinding support to the xserver will result in races between the DE dealing with the hotplug of a secondary GPU and the server itself dealing with it. However we've waited for years for any Desktop Environments to actually start doing some sort of autoconfiguration of secondary GPUs and there is still not a single DE dealing with this, so I believe that it is time to upstream this now. To avoid potential future problems if any DEs get support for doing secondary GPU configuration themselves, the new autobind functionality is made optional. Since no DEs currently support doing this themselves it is enabled by default. When DEs grow support for doing this themselves they can disable the servers autobinding through the servers cmdline or a xorg.conf snippet. Signed-off-by: Dave Airlie <airlied@gmail.com> [hdegoede@redhat.com: Make configurable, fix with nvidia, submit upstream] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> --- Changes in v2: -Make the default enabled instead of installing a xorg.conf snippet which enables it unconditionally Changes in v3: -Handle GPUScreen autoconfig in randr/rrprovider.c, looking at rrScrPriv->provider, rather then in hw/xfree86/modes/xf86Crtc.c looking at xf86CrtcConfig->provider. This fixes the autoconfig not working with the nvidia binary driver
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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https://gitlab.freedesktop.org/xorg/xserver
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