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SubjectRe: Linux 2.6.3-rc3
Benjamin Herrenschmidt <> writes:

> On Sun, 2004-02-15 at 20:17, Peter Osterlund wrote:
> > Linus Torvalds <> writes:
> >
> > > Benjamin Herrenschmidt:
> > > o New radeonfb
> > > o Fix a link conflict between radeonfb and the radeon DRI
> > > o Fix incorrect kfree in radeonfb
> >
> > It doesn't seem to work on my x86 laptop. The screen goes black when
> > the framebuffer is enabled early in the boot sequence. The machine
> > boots normally anyway and I can log in from the network or log in
> > blindly at the console. I can then start the X server which appears to
> > work correctly, but switching back to a console still gives me a black
> > screen. Running "setfont" doesn't fix it. Here is what dmesg reports
> > when running 2.6.3-rc3:
> Did it ever work ? (I need to know if it's a regression or some problem
> that was already there in the first place). (Hrm... looking at the end
> of your mail, it indeed seem to be a regression with this version)

Yes, the old 2.6 radeon driver works, but has the transient screen
corruption problem that you fixed in 2.4 a while ago:

> Do you have some backlight control via the BIOS ? Can you dbl check it's
> not a problem with the backlight not beeing enabled ? (If you have
> working BIOS-driven backlight, try turning in all the way down, then
> back up).

Backlight is enabled. It is possible to change the backlight intensity
using Fn-F8 and Fn-F9, but it is not possible to completely turn off
backlight from the BIOS/keyboard. Changing the intensity works both
from within X and from the black console, but doesn't cure the

> I sounds like a problem with LVDS_GEN_CNTL register. This is very
> "touchy", the old radeonfb was wrong, but the new may not be fully right
> neither, basing myself on what XFree does, which is dodgy at least...
> I didn't fully figure out the proper sequence for powering up/down the
> LCD panel on the LVDS output. (Well, the code I have now works on all
> pmac laptop panels at least...)
> Also, what exact model of laptop are you using ?

It's a "Clevo 5600P" sold as a "Best 5650". More details at:

Peter Osterlund -
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