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From: Michael Buesch <mb@bu3sch.de>
To: linuxppc-dev@ozlabs.org
Subject: Re: Powerbook shuts down hard when hot, patch found
Date: Sat, 29 Sep 2007 13:22:59 +0200
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On Saturday 29 September 2007 13:06:59 Michael Buesch wrote:
> > This is very strange... Can you try also clearing VGA_DDC_CLK_OUT_EN and
> > VGA_DDC_DATA_OUT_EN and the same time and see if that helps ?
> 
> It still triggers the bug then.

I tried something else.
I removed the write and only added a printk with a register read
to print the contents (DDC REG IS 0x...) . This is the result:

[    0.431304] PCI: Enabling device 0000:00:10.0 (0006 -> 0007)
[    0.626866] radeonfb (0000:00:10.0): Invalid ROM signature 303 should be 0xaa55
[    0.626877] radeonfb: Retrieved PLL infos from Open Firmware
[    0.626887] radeonfb: Reference=27.00 MHz (RefDiv=12) Memory=203.00 Mhz, System=392.00 MHz
[    0.626897] radeonfb: PLL min 12000 max 35000
[    0.627194] DDC REG IS 0x00000303
[    0.763751] i2c-adapter i2c-2: unable to read EDID block.
[    0.983746] i2c-adapter i2c-2: unable to read EDID block.
[    1.203745] i2c-adapter i2c-2: unable to read EDID block.
[    1.280001] DDC REG IS 0x00000000
[    1.620189] ieee1394: Host added: ID:BUS[0-00:1023]  GUID[001124fffed98036]
[    1.670984] radeonfb: Monitor 1 type LCD found
[    1.670992] radeonfb: EDID probed
[    1.670997] radeonfb: Monitor 2 type no found
[    1.671012] radeonfb: Using Firmware dividers 0x0002008e from PPLL 0
[    1.671075] radeonfb: Dynamic Clock Power Management enabled
[    1.712658] Console: switching to colour frame buffer device 160x53
[    1.735555] radeonfb: Backlight initialized (radeonbl0)
[    1.735746] radeonfb (0000:00:10.0): ATI Radeon NP 
[    1.738776] Generic RTC Driver v1.07
[    1.738995] Macintosh non-volatile memory driver v1.1
...

Note that the function is called twice. Is that correct?

-- 
Greetings Michael.