[Intel-gfx] Screen unusable for console until X starts (945GM)

[Rolf Eike Beer]

Am Samstag 20 Oktober 2012, 14:18:10 schrieb Daniel Vetter:
> On Sat, Oct 20, 2012 at 2:14 PM, Rolf Eike Beer <eike-kernel at sf-tec.de> 
wrote:
> > Am Samstag 20 Oktober 2012, 13:57:37 schrieb Daniel Vetter:
> >> On Sat, Oct 20, 2012 at 8:30 AM, Rolf Eike Beer <eike-kernel at sf-tec.de>
> > 
> > wrote:
> >> > I have an older Laptop with this card in it:
> >> > 
> >> > [    0.813208] agpgart-intel 0000:00:00.0: Intel 945GM Chipset
> >> > [    0.813284] agpgart-intel 0000:00:00.0: detected gtt size: 262144K
> >> > total, 262144K mappable
> >> > [    0.814188] agpgart-intel 0000:00:00.0: detected 8192K stolen memory
> >> > [    0.814377] agpgart-intel 0000:00:00.0: AGP aperture is 256M @
> >> > 0xc0000000
> >> > 
> >> > I observe the following strange behavior: if I start up the system
> >> > (grub2,
> >> > openSUSE 12.1) I see the splash screen appearing shortly. In most cases
> >> > it
> >> > will then disappear and the screen will become just black. This is not
> >> > the
> >> > delay "X is loading but has not put anything on the screen", but it is
> >> > much
> >> > earlier. I'm asked for a crypt password during bootup, which in most
> >> > cases
> >> > now happens totally in the dark, i.e. no console messages at all, no
> >> > prompt. Booting just to runlevel 3 leaves me with a black screen but a
> >> > functional system.
> >> > 
> >> > The strange thing is: sometimes (like 10%) things are just working,
> >> > i.e. I
> >> > have console output. I've tested with 3.1.10 as well as 3.6.2 and both
> >> > have
> >> > the problem. I've run a number of 2.6 kernels before on this system,
> >> > but I
> >> > do not recall when the problem occured or which is one that definitely
> >> > worked.
> >> > 
> >> > Starting X will always get the screen back into working state, i.e. the
> >> > system is normally usable after startup, but it is just annoying to see
> >> > nothing during startup.
> >> > 
> >> > Any hints, patches, whatever?
> >> 
> >> Please attach drm.debug=0xe to your kernel cmdline, boot 3.6 and
> >> attach complete dmesg (up to the point where X makes something appear
> >> on the screen).
> > 
> > Attached. Since I did not mention it earlier: from the moment on X is
> > started consoles also work fine.
> 
> Another case where something sets the backlight brightness to zero
> when we take over, and the X restores it to something sane again. If
> the backlight keys on your machine work, you should be able to
> brighten things up even before X starts.
> 
> Adding Jani since he's recently looked at an eerily similar bug.

I can switch the screen brightness during startup, but that only makes the 
black screen a dark grey screen, I still see no text.

Eike
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