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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20121020/0d20a10d/attachment.pgp>
