* http://events.linuxfoundation.org/sites/events/files/slides/brezillon-drm-kms.pdf

==== Direct Rendering Infrastructure @ http://dri.sf.net ====

[[Debian]] : http://dri.freedesktop.org/wiki/Download http://www.nixnuts.net/files/README.txt

==== S3TC / Compressed textures : ====

http://homepage.hispeed.ch/rscheidegger/dri_experimental/s3tc_index.html

http://www.digit-life.com/articles/reviews3tcfxt1/

wget http://homepage.hispeed.ch/rscheidegger/dri_experimental/libtxc_dxtn050819.tar.gz

  ed2k://|file|libtxc_dxtn050819.tar.gz|9950|c71a8a8cb775ea9cb774193ad90d557b|

cat << EOF >> /etc/apt/sources.list
  #{ [[3D]] : sudo apt-get install libtxc-dxtn
   deb http://emeitner.f2o.org/debian/ ./
   deb-src http://emeitner.f2o.org/debian/ ./
  #} http://rzr.online.fr/q/DRI
EOF


=== Compile DRI @ http://dri.freedesktop.org/wiki/Download===

  mkdir -p /usr/local/src/tmp/dri
  cd /usr/local/src/tmp/dri
  cvs -z3 -d:pserver:anonymous@dri.freedesktop.org:/cvs/dri login && \
  cvs -z3 -d:pserver:anonymous@dri.freedesktop.org:/cvs/dri co drm
  cd drm && ./autogen.sh

=== Errors / DRI on [[AmiloA]]'s [[Radeon]] [[IGP 320M]] with [[Kernel]] 2.6===

Supports DRI but conflicts on [[IRQ]]s see [[DSDT]].

dri module works along [[xorg]] 6.8.1 on [[Radeon]] [[IGP 320M]] ... (at last =========)=========

But, on my [[AmiloA]] there are still [[IRQ]] problems.

When I start [[XWindow]] with dri, there's a system freeze (I didn't try to reach my computer via [[SSH]], though).

I order to manage to start X, I need to unactivate some modules that use [[IRQ]] #11.

For information, here is my default IRQ after system start :

  cat /proc/interrupts
           [[CPU]]0
  0:   11814031          XT-PIC  timer
  1:      37033          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  5:          2          XT-PIC  ohci1394
  9:          0          XT-PIC  acpi
  10:          0          XT-PIC  ohci_hcd
  11:      84447          XT-PIC  ohci_hcd, yenta, yenta, eth0, ALI 5451
  12:     281295          XT-PIC  i8042
  14:     110926          XT-PIC  ide0
  15:     123694          XT-PIC  ide1


[[IRQ]] #11 is quite crowded ======

But I managed to start X without freeze after a reboot without sound modules being "modprobed" :

           CPU0
  0:   11814031          XT-PIC  timer
  1:      37033          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  5:          2          XT-PIC  ohci1394
  9:          0          XT-PIC  acpi
  10:          0          XT-PIC  ohci_hcd
  11:      84447          XT-PIC  ohci_hcd, yenta, yenta, eth0
  12:     281295          XT-PIC  i8042
  14:     110926          XT-PIC  ide0
  15:     123694          XT-PIC  ide1


This way, X starts with dri activated, and it works ======

But when X starts, I get the following kernel message : Disactivating irq #11, and then eth0 no longer works. No enemy-territory playing on the net for me yet ======

As [[IRQ]] #11 gets disactivated, I believe that one or two of the usb ports no longer work (I didn't check), and that [[PCMCIA]] doesn't work neither (I don't have PCMCIA cards).
And no sound, since I disactivated it myself...

But [[3D]] acceleration works ======

Some times later, I have managed to get also sound, booting with the "acpi_irq_balance" kernel option, which puts the ALI [[M5451]] module at IRQ #10 :

           CPU0
  0:   11814031          XT-PIC  timer
  1:      37033          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  5:          2          XT-PIC  ohci1394
  9:          0          XT-PIC  acpi
  10:          0          XT-PIC  ohci_hcd, ALI 5451
  11:      84447          XT-PIC  ohci_hcd, yenta, yenta, eth0
  12:     281295          XT-PIC  i8042
  14:     110926          XT-PIC  ide0
  15:     123694          XT-PIC  ide1


I tried to recompile the radeon kernel module without IRQ sharing, but 3D applications segfault.

I don't know X enough to be able to find how to solve the irq problem.

I believe that DRI doesn't really need an [[IRQ]] in most cases, because after the "Disactivation irq #11" [[Kernel]] message, 3D acceleration still works ======

=== Mistakes : libGL error: failed to open DRM: Operation not permitted===


  glxinfo
  # name of display: :0.0
  # libGL error: failed to open DRM: Operation not permitted
  # libGL error: reverting to (slow) indirect rendering
  # display: :0  screen: 0
  # direct rendering: No

http://www.sh.nu/lgfaq/#drmperms

  Section "DRI"
      Mode     0666
  EndSection

-----------------------------------------------------------------------------

  $ glxinfo
  name of display: :0.0
  libGL warning: 3D driver returned no fbconfigs.
  libGL error: InitDriver failed
  libGL error: reverting to (slow) indirect rendering
  display: :0  screen: 0
  direct rendering: No

  * http://bugs.debian.org/318319



=== error : radeon_dri.so  ===

@tag: [[radeon_dri]]

<html>
LIBGL_DEBUG=debug glxinfo
name of display: :0.0
libGL error: dlopen /usr/lib/dri/radeon_dri.so failed (/usr/lib/dri/radeon_dri.so: cannot open shared object file: No such file or directory)
libGL error: unable to load driver: radeon_dri.so
display: :0  screen: 0
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)
...
</html>

  aptitude install libgl1-mesa-dri

worked for me on debian

  * http://ubuntuforums.org/showthread.php?p=4153672#post4153672


===== MORE =====

@TaG: [[XWindow]] [[drm]] [[xserver-xfree86]] [[OpenGL]] [[3D]] [[xorg]] [[Stereo]] [[TvOut]] [[IGP]] [[GLX]]


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