[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-Id: <201012241458.07058.maciej.rutecki@gmail.com>
Date: Fri, 24 Dec 2010 14:58:06 +0100
From: Maciej Rutecki <maciej.rutecki@...il.com>
To: Jochen Voss <voss@...huhn.de>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Chris Wilson <chris@...is-wilson.co.uk>,
Dave Airlie <airlied@...hat.com>
Subject: Re: post-rc4 regression (bisected): blank screen on ASUS P5KPL-AM
Similar (or the same):
https://bugzilla.kernel.org/show_bug.cgi?id=25242
On poniedziaĆek, 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@...is-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@...ll.ch>
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Signed-off-by: Dave Airlie <airlied@...hat.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@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists