Bug#679312: xserver-xorg-video-radeon: Rotation fails due to "Acceleration init failed", but DRI works nevertheless

terayamashuji terayamashuji at googlemail.com
Thu Jun 28 11:11:57 PDT 2012

2012/6/28 Michel Dänzer <daenzer at debian.org>

> On Mit, 2012-06-27 at 22:24 +0200, Johannes Baiter wrote:
> 'a' at the prompt after writing the report, but it was included by the
> package bug script anyway.

The log that was auto-attached was actually the log without rotation, not
that it mattered greatly :-)

> > OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x209)
> llvmpipe is software rendering, not hardware acceleration.
> Ah, that explains a lot! Somehow my brain was hard-wired into associating
lack of acceleration with the MESA software driver, I haven't been using
the open source radeon driver for a long time :-)

> > DRM Information from dmesg:
> > ---------------------------
> > [    0.000000] No AGP bridge found
> > [    0.000000] No AGP bridge found
> > [    0.463471] Linux agpgart interface v0.103
> Looks like something is preventing the radeon kernel driver from
> loading / initializing. Is it built into the kernel or as a module? If
> the latter, what happens if you try to run 'sudo modprobe radeon' from
> console (ideally before X starts)?

That did the trick! Turns out the radeon module was not loaded at
boot-time, probably it was not in the initrd. Loading the module and
starting X.org with rotation enabled works now, as does XRandR.
Sorry for opening a silly "bug" like this, but maybe this could be
considered a real-world use-case for more explicit error messages ;-)

Thank you!
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