Hi Xorg-folks, I want to report a bug.
I'm using Gentoo Linux (CPU: PowerPC G4) and updated my xorg-server to
the version 1.5.3-r6 and now my X11 performance for OpenGL
(Mesa 7.3-r1) is bad and has wrong colours (eg. glxgears).
I did a little investigation of this problem and saw this:
xorg-server-1.5.3-r6 has a library called libglx.so. This library uses
drmOpenOnce(NULL, "pci:0001:01:08.0", ...)
to get the graphics card.
lspci reports
0001:01:08.0 VGA compatible controller:
ATI Technologies Inc Radeon RV250 If [Radeon 9000] (rev 01)
So the PCI Bus ID seems to be correct.
libdrm-2.4.5 has the function drmOpenOnce(). This function goes down to
drmOpen(NULL, "pci:0001:01:08.0") and
drmOpenByBusid("pci:0001:01:08.0").
Now drmGetBusid(fd) is called and returns "pci:0000:01:08.0". Which is
wrong, because it differs from the original PCI Bus ID. So my graphics
card will not be used with hardware accelerated OpenGL.
drmGetBusid() calls the kernel module drm via IOCTL
DRM_IOCTL_GET_UNIQUE. (see file drm_ioc32.c). So is it a bug in the
kernel? Who is the right person to report this?
Thanks for any suggestions
Johannes
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