https://bugs.freedesktop.org/show_bug.cgi?id=63709
Priority: medium
Bug ID: 63709
Assignee: dri-devel@lists.freedesktop.org
Summary: Desktop Effects on 3D desktop environments are
jerky/stutter.
Severity: critical
Classification: Unclassified
OS: Linux (All)
Reporter: equites.v...@gmail.com
Hardware: x86-64 (AMD64)
Status: NEW
Version: unspecified
Component: DRM/Radeon
Product: DRI
Hardware: Gigabyte GA-880GM-d2h, Radeon HD4250 512 shared VRAM, 4GB RAM total,
Phenom x4 965BE (3.4Ghz quad). Everything at stock clock speed and voltages.
BIOS flashed to latest stable version FF from Gigabyte.
user@user-GA-880GM-D2H:~$ glxinfo | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RS880
OpenGL version string: 3.0 Mesa 9.1.1
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
user@user-GA-880GM-D2H:~$ glxinfo | grep render
direct rendering: Yes
OpenGL renderer string: Gallium 0.4 on AMD RS880
GL_NV_conditional_render, GL_AMD_conservative_depth,
------------------------------------------------------------
In a default KDE install on Ubuntu: Default settings are Use OpenGL 2 shaders
enabled and VSync enabled. In Desktop effects such as translucent background
when dragging windows and Minimize Animation, dragging a window results in
stuttering movement in the former (the screen does not shift. but the window
stutters as if it stops for a second and catches up but it's fast so it looks
like a stutter [missing frames?]) and in Minimize animation the window stutters
also as the animation takes place. Disabling VSync and OpenGL 2 shaders
options, there is still stuttering animation. This seems to be OpenGL specific
as XRender compositing provides a smooth experience.
In a Gnome Shell 3.8 install: In previous versions of Gnome Shell, there were
jerky animations also. In 3.8, which is what is installed on my computer right
now in Ubuntu 13.04, the animations are not ALWAYS noticeably jerky, but
sometimes they do jerk when happening, it's noticeable in the animation when
switching to a new window from the overview and the window slides in front of
the desktop. It does not always jerk but often enough. In glxgears I get 58/59
fps normally, and with glxgears window maximized, it still gives the same frame
rate. But when switching between three or four windows, there's a jerk in the
animation and it shows up in glxgears as a drop in the fps and it goes down to
50-51 fps and is unable to keep up with the refresh rate. Also, in glxgears, I
have noticed that the gears move smoothly but after maximizing them, they run
smoothly for some seconds, and then I notice a jerk/stutter in the gears once,
and then it runs smoothly again. In Gnome Shell, you will probably not notice
the jerks when you first use it, but it's definitely there and is an annoyance
for someone who uses it a long time. And the stuttering animations are
definitely very noticeable on KDE in a default install with desktop effects.
This is all with no custom Xorg conf. With swbuffersWait 0 in Xorg conf, the
stuttering is even more noticeable as ever in Gnome, it seems to me.
This seems to be a driver bug (correct me if I'm wrong, I'm a relative newbie
to Linux.), so I'm posting this report here. But this is a major problem that
needs to be fixed soon. What user wants to use Linux when the major desktops
run with jerky effects.
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