Bug 96699

Summary:	Missing framebuffer copy for flicker-free startup
Product:	xorg	Reporter:	Daniel Drake <dan>
Component:	Driver/AMDgpu	Assignee:	xf86-video-ati maintainers <xorg-driver-ati>
Status:	RESOLVED INVALID	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Daniel Drake 2016-06-27 21:41:31 UTC

A standard setup for a linux distro is for plymouth to launch X and gdm. Currently when booting there is a flicker at the time when X launches.

There is a carefully done handoff there between the two, where plymouth drops the drm master and them gdm takes it, etc. But for flicker-free boot this does rely on the X driver starting up with the same framebuffer contents as what was seen before.

For example, https://github.com/endlessm/xf86-video-armsoc/commit/7f15fa47b6c35b154cbb39bb6145025b51af401c

It would be great if this could be implemented in amdgpu.

Comment 1 Alex Deucher 2016-06-27 22:00:50 UTC

This has been implemented in amdgpu since it was created.  See drmmode_copy_fb() in src/drmmode_display.c.

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