Panic when starting X with Intel KMS

[Gustau Pérez i Querol]

    Hi,

    I'm having panics or hard freezes when starting X with an Intel 
video card. The machine is able to start old X+twm without problems but 
when I try gnome3 (in normal or fallback mode, doesn't matter) the 
machine panics or hard freezes.

    This doesn't happen when running X with vesa. With vesa the gnome is 
able to start in debug mode. Also, an old i386 with an nvidia card is 
able to run that gnome3 with composition so I'd say it has to do with 
the intel card.

    These are the specs of the machine:

      FreeBSD 10.0-CURRENT #4 r+3dc57aa: Wed Jul 17 15:13:07 CEST 2013
      root at portgus:/usr/obj/usr/src/sys/CUSTOM amd64
      FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
      RAM: 8GB
      Video Card: Intel chipid=0x00468086

    The debugging knobs in the kernel config are there. I can also 
confirm that I can break to the debugger with CTRL+ALT+ESC before 
starting X. The world was build without debug symbols.

    Because the machine runs with an Intel card, I had to use my $work 
dockstation to obtain a serial port and do the debug via serial port.

   When starting X, either the machine freezes hard (and so no 
CTRL+ALT+ESC) or the machine panics. It has never executed X without 
panics or freezes.

    I was able to obtain a core dump, the results are at:

         https://dl.dropboxusercontent.com/u/2094962/core.txt.4

    I was unable to dive further because the dump only shows the kernel 
side of things. The bt only seems to show the kernel side an the user 
side of things seems  to be corrupt. Any other info I can provide, let 
me know. I can easy do the debug via serial port.

    Gus

-- 
    Salut i força,

    Gustau

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O O O Gustau Pérez i Querol
O O O Unitat de Gestió dels departaments
O O O Matemàtica Aplicada IV i Enginyeria Telemàtica

       Universitat Politècnica de Catalunya
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