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. Cheers, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
