[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Powerbook G4 1.33 GHz CPU temperature

On Mon, 2004-09-20 at 23:29, Michael Schmitz wrote:

> A ghost image of whatever is on the screen, displaced by (roughly) 128
> pixels to the left. At the refresh rate used by X, the ghost image
> flickers so that you see it light up with a periodicity of around a cm
> vertical, or approximately 40 pixels (that's rather harder to estimate).
> The individual streaks of ghosting seem to wander down, then jump up
> again.
> Funny enough, it's systematic enough to persist across a suspend to disk
> :-)

Ok, this isn't flicker, more like the PLL locking improperly.. I've seen
this happening randomly on anton's new laptop, usually it goes away if
you force radeonfb to reprogram the display a couple of times.

Have you tried, when it happens, turning the backlight all the way down
to 0, waiting a bit, then back up ? Does this help at all ?

> If you have any ideas about which registers to look at, I'd be happy to
> debug this further. With radeonfb debug messages enabled I've only seen
> LVDS_GEN_CNTL show any variation between initial boot setup and later
> console switches. But that doesn't show a difference between the X vt and
> the console vt ...
> > > Maybe time to be more specific WRT sensor and fan location in the driver.
> >
> > I accept patches :) Would be worth looking more precisely at what Darwin
> > does too
> Yep. At one time in the distant past I had registered for access to Darwin
> source but that's lost in the noise... I'll re-pull and send a patch,
> including the refrigerator support for the thermostat (for pmdisk).
> 	Michael
Benjamin Herrenschmidt <benh@kernel.crashing.org>

Reply to: