First of all, thanks for a response far faster than I expected.
On Wednesday 03 October 2007, Jamie Zawinski wrote:
> 1) If a GL saver is consuming 100% CPU, then that means that OpenGL
> is running on the CPU and not on the GPU, in other words, it's not
> using your graphics hardware at all. So you should try and figure out
> why that would be.
>
Hmm. glxinfo(1) and glewinfo(1) seem to suggest OpenGL is set up ok:
$ glxinfo
name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: NVIDIA Corporation
server glx version string: 1.4
server glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
GLX_EXT_texture_from_pixmap, GLX_ARB_multisample, GLX_NV_float_buffer,
GLX_ARB_fbconfig_float, GLX_EXT_framebuffer_sRGB
[snipped]
$ glewinfo
---------------------------
GLEW Extension Info
---------------------------
GLEW version 1.4.0
Reporting capabilities of display :0.0, visual 0x2b
Running on a GeForce 8500 GT/PCI/SSE2 from NVIDIA Corporation
OpenGL version 2.1.1 NVIDIA 100.14.11 is supported
[snipped]
glewinfo further says I have almost all the GL_NV features. Do you know of any
other diagnostic tools I should use? Otherwise, if it's running on the CPU, I
suspect it is still a xscreensaver-gl problem.
> 2) There's no way for xscreensaver to realize that it's not on the
> selected console. So even though it might be sensible for
> xscreensaver on deselected consoles to go into "black" mode, there's
> no way to implement that. The X server simply does not provide that
> information.
Perhaps not through the X server, but it seems to me after some search that
there is a way. The free desktop's ConsoleKit includes a function for finding
the active console
(http://cgit.freedesktop.org/ConsoleKit/tree/src/ck-sysdeps-linux.c,
ck_get_active_console_num is the last function in the file as I write this),
and obviously there's a way to get a mapping of screens to VTs -- this
mapping is shown to me in the "switch user" submenu of my K menu.
Thanks again,
Shai.
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