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I recently managed to install Arch Linux onto my Macbook (2,1). It's working fine for me, except for a more or less dramatic problem during the boot process.

In almost 2 out of 3 cases i get the following error message while the system seems to freeze:

fb: conflicting fb hw usage inteldrmfb vs EFI VGA - removing generic driver

Sometimes it boots fine though.

Any idea how to solve this? Thank you in advance.

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UPDATE: As i have tried to disable gfx mode as decribed here i could see the actual error message popping up:

...intel_display_capture_error_state+0x6b/0x2a...

...

Kernel panic - not syncing: Fatal exception in interrupt

Mysteriously though my laptop seems to boot without any problem most of the time and the error reappears not as often as in the beginning.

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This is not an error message. It's logged as kern.info and is just to inform you that the inteldrmfb driver is taking over graphics control from the previously-loaded generic one. You'll find it in dmesg even after normal boots. –  grawity Jul 13 '13 at 15:02
    
This explains why i see the message upon normal boots. But in case my laptop won't boot, this is the last output i see. Setting the flag "nomodeset" is a workaround i found and the system boots every time normally, but obviously X won't start with it. –  Julian Weimer Jul 13 '13 at 16:20
    
I assume you've read the wiki? Also, 2.1 is a very old version of MacBook, so it may be hard to find help with it. –  tjameson Jul 13 '13 at 17:59
    
There is actually a full Wiki page dedicated to the MacBook which also includes a section for mine which i found to be very useful. I am quite happy with the setup so far. –  Julian Weimer Jul 19 '13 at 20:15
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