Messages in this thread |  | | | From | Maciej Rutecki <> | | Subject | Re: post-rc4 regression (bisected): blank screen on ASUS P5KPL-AM | | Date | Fri, 24 Dec 2010 14:58:06 +0100 |
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Similar (or the same): https://bugzilla.kernel.org/show_bug.cgi?id=25242
On poniedziałek, 20 grudnia 2010 o 15:06:16 Jochen Voss wrote: > Hello, > > My system, when booted with recent kernels, fails to show any output > on the monitor. The problem occurs very early during bootup (I never > see anything after the messages from grub), the monitor indicates that > there is no video signal at all and dmesg shows the following lines: > > [ 1.540465] usbhid: USB HID core driver > [ 2.490014] No connectors reported connected with modes > [ 2.490019] [drm] Cannot find any crtc or sizes - going 1024x768 > [ 2.496064] Console: switching to colour frame buffer device 128x48 > [ 2.497729] fb0: inteldrmfb frame buffer device > > The machine seems fine otherwise: I can log in remotely and logging in > from the console (by typing blindly without visual feedback) also > works. > > The problem is present in the current kernel as of this morning (I see > it with commit 55ec86f848a5f872fd43f5d7206464a0af419110). Bisection > indicates that it is caused by the following commit. > > commit 541cc966915b6756e54c20eebe60ae957afdb537 > Author: Chris Wilson <chris@chris-wilson.co.uk> > Date: Mon Dec 6 11:24:07 2010 +0000 > > drm: Don't try and disable an encoder that was never enabled > > Prevents code that assumes that the encoder is active when > asked to be disabled from dying a horrible death. > > Reported-by: Daniel Vetter <daniel.vetter@ffwll.ch> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> > Signed-off-by: Dave Airlie <airlied@redhat.com> > > I verfied that the problem disappears when booting recent kernels > (i.e. 55ec86f848a5f872fd43f5d7206464a0af419110) with the offending > commit reverted. The screen works again and the dmesg output now > changes to > > [ 1.542515] usbhid: USB HID core driver > [ 1.547569] Console: switching to colour frame buffer device 210x65 > [ 1.551558] fb0: inteldrmfb frame buffer device > > Note that the one second wait which was present in the bad dmesg > has now disappeared. > > System information: > > ASUS P5KPL-AM mainboard (Intel G31 chipset) > Intel Core2 quad core CPU > Ubuntu 10.10 > > Appended files: > > dmesg.bad: dmesg for 55ec86f848a5f872fd43f5d7206464a0af419110 > dmesg.good: dmesg for 55ec86... with > 541cc966915b6756e54c20eebe60ae957afdb537 reverted > lspci: "lspci -v" output (on a good kernel) > > I'd be happy to send further information or to try patches etc. > > I hope this helps, > Jochen
-- Maciej Rutecki http://www.maciek.unixy.pl -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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