On Saturday 29 September 2007 23:51:55 Benjamin Herrenschmidt wrote: > > On Sat, 2007-09-29 at 13:22 +0200, Michael Buesch wrote: > > 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? > > Yes. That's expected, with different registers though. > > I don't quite get what's going on. I'll have to figure that out with ATI > if they bother helping...
This all smells to me like a silicon bug, so I'd start searching in the silicon erratas. But I'm not sure, of course. It's also strange that it depends on temperature. (That's why I first expected the PMU would cause this). Thanks for your help. -- Greetings Michael. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
