** Description changed:

  Binary package hint: xorg
  
  Thought it was
  https://bugs.launchpad.net/gentoo/+source/mesa/+bug/277709 , but no joy.
  
  To reproduce I start a failsafe console session, run kwin (kwin has
  compositing enabled, with opengl backend - no crash with xrender
  backend).
  
  Xorg backtrace (from startx over ssh):
  
  (EE) intel(0): tried to update DSPARB with both planes enabled!
  (EE) intel(0): underrun on pipe B!
  (EE) intel(0): underrun on pipe B!
  (EE) intel(0): underrun on pipe B!
  
  Backtrace:
  0: /usr/bin/X11/X(xf86SigHandler+0x79) [0x80c2ff9]
  1: [0xb8045400]
  2: /usr/lib/dri/i915_dri.so(intelCopyTexImage2D+0x14a) [0xaf67e83a]
  3: /usr/lib/dri/i915_dri.so(_mesa_CopyTexImage2D+0x1d4) [0xaf718334]
  4: /usr/lib/xorg/modules/extensions//libglx.so [0xb7b351ca]
  5: /usr/lib/xorg/modules/extensions//libglx.so [0xb7b5e36f]
  6: /usr/lib/xorg/modules/extensions//libglx.so [0xb7b62c0a]
  7: /usr/bin/X11/X(Dispatch+0x34f) [0x808c88f]
  8: /usr/bin/X11/X(main+0x47d) [0x8071d1d]
  9: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7c44685]
  10: /usr/bin/X11/X [0x8071101]
  Saw signal 11.  Server aborting.
  xinit:  connection to X server lost.
  
  waiting for X server to shut down
  
  gdb backtrace attached.
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation 82852/82855 GM/GME/PM/GMV 
Processor to I/O Controller [8086:3580] (rev 02)
+       Subsystem: Matsushita Electric Industrial Co., Ltd. Device [10f7:8338]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation 82852/855GM 
Integrated Graphics Device [8086:3582] (rev 02)
+       Subsystem: Matsushita Electric Industrial Co., Ltd. Device [10f7:8338]

-- 
Xorg crashed with SIGSEGV in _swrast_copy_teximage2d [i855GM]
https://bugs.launchpad.net/bugs/287485
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