From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 109332] xf86-video-amdgpu - commit 0d60233d introduced
stuttering with mouse cursor operations
Date: Mon, 14 Jan 2019 13:33:45 +0000
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Date: Mon, 14 Jan 2019 13:33:44 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=3D109332
--- Comment #2 from Nicholas Kazlauskas ---
In this case it's not actually the mouse operations themselves causing the
stuttering but the framebuffer change. This is a known limitation with the
async plane updates API in DRM and not something we can really fix in DC un=
til
there's a better API for async updates.
The page-flip IOCTL advertises itself as non-blocking but in reality it's n=
ot -
if there's any commit work touching the plane it's going to be blocked until
that finishes and that'll be any non asynchronous cursor update, gamma upda=
te,
property update, or anything else that occurs. This is what the stuttering
comes from.
So while it's a valid use of the cursor UAPI to double buffer cursors it's =
not
something I'd really recommend doing for an atomic driver with how DRM is
currently setup. Maybe this can be a configurable option in the meantime? I=
'm
not sure how much work that would be to add and maintain, though.
--=20
You are receiving this mail because:
You are the assignee for the bug.=
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Date: Mon, 14 Jan 2019 13:33:44 +0000
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X-Bugzilla-URL: http://bugs.freedesktop.org/
Auto-Submitted: auto-generated
Commen=
t # 2
on bug 10933=
2
from Nicholas Kazlauskas<=
/a>
In this case it's not actually the mouse operations themselves=
causing the
stuttering but the framebuffer change. This is a known limitation with the
async plane updates API in DRM and not something we can really fix in DC un=
til
there's a better API for async updates.
The page-flip IOCTL advertises itself as non-blocking but in reality it's n=
ot -
if there's any commit work touching the plane it's going to be blocked until
that finishes and that'll be any non asynchronous cursor update, gamma upda=
te,
property update, or anything else that occurs. This is what the stuttering
comes from.
So while it's a valid use of the cursor UAPI to double buffer cursors it's =
not
something I'd really recommend doing for an atomic driver with how DRM is
currently setup. Maybe this can be a configurable option in the meantime? I=
'm
not sure how much work that would be to add and maintain, though.
You are receiving this mail because:
- You are the assignee for the bug.
=
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