[Bug 196777] Virtual guest using video device QXL does not reach GDM

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=196777

--- Comment #14 from Gerd Hoffmann (kraxel at redhat.com) ---
> We could possibly decouple the primary surface from the drm framebuffers, so
> the drm framebuffers effectively become shadow framebuffers, and every
> display update becomes a drm framebuffer -> primary surface blit.  Not sure
> whenever that scheme can work properly with xorg though.  Also has a high
> chance to cause xorg performance regressions.

Turns out there is an easy way out: shadow dumb framebuffers only.

https://www.kraxel.org/cgit/linux/log/?h=drm-qxl-atomic

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