https://bugs.freedesktop.org/show_bug.cgi?id=49603
Bug #: 49603 Summary: [regression] Fullscreen video no longer smooth with GPU in low power mode Classification: Unclassified Product: Mesa Version: 8.0 Platform: Other OS/Version: All Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/r600 AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: sa@whiz.se
With Mesa 8.0 I can watch fullscreen videos using Totem (and other players that uses an OpenGL sink) with my GPU set to "low" power mode without problems. With 8.0.1 (and later) this is no longer possible. Every so often I get stalls and what looks like dropped frames. It's a blink and you'll miss it kind of thing, but over a longer period of time (such as watching a movie) it's quite noticeable and annoying.
Setting the card to "mid" or higher works around this, but as it's a passive card I would prefer to keep it running in low as much as possible.
Bisecting for this bug turns up the below commit, I have confirmed it by reverting this change.
(I'm not sure if adding the patch author to the cc list is considered good practice or not?)
System environment: -- system architecture: 32-bit -- Linux distribution: Debian unstable -- GPU: REDWOOD -- Model: XFX Radeon HD 5670 1GB -- Display connector: DVI -- xf86-video-ati: 6.14.4 -- xserver: 1.12.1 -- mesa: 8.0.2 -- drm: 2.4.33 -- kernel: 3.3.4
106ea10d1b246aba1a0f4e171fd7d21268f3960f is the first bad commit commit 106ea10d1b246aba1a0f4e171fd7d21268f3960f Author: Simon Farnsworth simon.farnsworth@onelan.co.uk Date: Tue Feb 14 12:06:20 2012 +0000
r600g: Use a fake reloc to sleep for fences
r300g is able to sleep until a fence completes rather than busywait because it creates a special buffer object and relocation that stays busy until the CS containing the fence is finished.
Copy the idea into r600g, and use it to sleep if the user asked for an infinite wait, falling back to busywaiting if the user provided a timeout.
Signed-off-by: Simon Farnsworth simon.farnsworth@onelan.co.uk Signed-off-by: Alex Deucher alexander.deucher@amd.com (cherry picked from commit 8cd03b933cf868ff867e2db4a0937005a02fd0e4)
Conflicts:
src/gallium/drivers/r600/r600_pipe.c
:040000 040000 390170e370f86ee323dce284906ed21693ed9d09 cccea412e6be4f3619422196231e02b375ab4772 M src