Xorg and multiple graphics cards

[Alex Deucher]

On 4/16/09, martin f krafft <madduck at madduck.net> wrote:
> also sprach Alex Deucher <alexdeucher at gmail.com> [2009.04.16.1559 +0200]:
>
> > >  1. it displays some Radeon identification string on both heads
>  > >    connected to the primary card, while the head on the secondary
>  > >    card stays black
>  > >  2. the identification string changes into the sequence
>  > >    "♀♀#♀#♀#♀#♀#♀", which stays there forever, but the screens
>  > >    eventually go black
>  > >  3. the log (attached) informs me of a segfault with this backtrace:
>  > >
>  > >       Backtrace:
>  > >       0: /usr/bin/X(xf86SigHandler+0x6a) [0x47898a]
>  > >       1: /lib/libc.so.6 [0x7f8e894b1190]
>  > >       2: /usr/bin/X(RRCrtcSetRotations+0) [0x525c90]
>  > >       3: /usr/bin/X(xf86RandR12SetRotations+0x77) [0x4b90a7]
>  > >       4: /usr/bin/X(xf86CrtcScreenInit+0xad) [0x4b45ad]
>  > >       5: /usr/lib/xorg/modules/drivers//radeon_drv.so(RADEONScreenInit+0x1bd8) [0x7f8e8701ef38]
>  > >       6: /usr/bin/X(AddScreen+0x249) [0x436209]
>  > >       7: /usr/bin/X(InitOutput+0x277) [0x46ab27]
>  > >       8: /usr/bin/X(main+0x2c6) [0x4369f6]
>  > >       9: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f8e8949d5a6]
>  > >       10: /usr/bin/X [0x435e99]
>  > >
>  > >       Fatal server error:
>  > >       Caught signal 11.  Server aborting
>  >
>  > Does it work any better with xserver 1.5 or newer?  IIRC, there was a
>  > bug where RRCrtcSetRotations() dereferenced pScrn->pScreen before it
>  > was set.  I don't remember off hand when it was fixed however.
>
>
> I now tried:
>
>   (II) Module radeon: vendor="X.Org Foundation"
>         compiled for 1.6.0, module version = 6.12.2
>         Module class: X.Org Video Driver
>         ABI class: X.Org Video Driver, version 5.0
>
>  and I get the exact same behaviour described under (1) and (2),
>  although (1) passes a lot quicker, and the backtrace is slightly
>  different:
>
>   Backtrace:
>   0: /usr/bin/X(xorg_backtrace+0x26) [0x4ef046]
>   1: /usr/bin/X(xf86SigHandler+0x39) [0x484219]
>   2: /lib/libc.so.6 [0x7fed7f3da190]
>   3: /usr/bin/X(dixLookupPrivate+0xa) [0x433b7a]
>   4: /usr/lib/xorg/modules//libxaa.so [0x7fed7c9615e2]
>   5: /usr/lib/xorg/modules/drivers//radeon_drv.so [0x7fed7d22a2c1]
>   6: /usr/bin/X(xf86CrtcSetModeTransform+0x129) [0x4ac0a9]
>   7: /usr/bin/X(xf86SetDesiredModes+0x2a9) [0x4ac939]
>   8: /usr/lib/xorg/modules/drivers//radeon_drv.so [0x7fed7d20ab1f]
>   9: /usr/bin/X(AddScreen+0x1c6) [0x432846]
>   10: /usr/bin/X(InitOutput+0x241) [0x46d111]
>   11: /usr/bin/X(main+0x20e) [0x432f5e]
>   12: /lib/libc.so.6(__libc_start_main+0xe6) [0x7fed7f3c65a6]
>   13: /usr/bin/X [0x432599]
>
>  Thanks again for your time!
>

Can you get a full backtrace with gdb?
http://wiki.x.org/wiki/Development/Documentation/ServerDebugging

Thanks,

Alex