On Thu, 12 Jan 2012 19:29:37 +0100
Vincent Vanackere <vincent.vanackere at gmail.com> wrote:
> Hi,
>
> I when trying to run any recent (>= 3.2) kernel on my laptop (a Thinkpad
> L520), I get a black screen at boot and the screen stays black (the rest of
> the system seems fine and e.g. I can log from ssh).
> This is a regression since kernel 3.1 was working fine... I just bisected
> the problem and if I did no mistake the misbehavior was caused by the
> following commit :
>
> ----------------------------------
> 4b645f14021871e06ce96c359bbdf0b48248c26e is the first bad commit
> commit 4b645f14021871e06ce96c359bbdf0b48248c26e
> Author: Jesse Barnes <jbarnes at virtuousgeek.org>
> Date: Wed Oct 12 09:51:31 2011 -0700
>
> drm/i915: add PLL sharing support to handle 3 pipes
>
> Add two new fields to the intel_crtc struct for 3 pipe support: no_pll
> and use_pll_a. The no_pll field is only set on the 3rd pipe to indicate
> that it doesn't have a PLL of its own and so shouldn't try to write the
> main PLL regs. The use_pll_a field controls which PLL pipe 3 will
> share, A or B. The core code will try to share PLLs with whichever pipe
> has the same timings, rejecting the mode set if none is found. This
> means that pipe 3 must always be set after one of the other pipes has
> been configured with real PLL settings.
>
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> Tested-By: Eugeni Dodonov <eugeni.dodonov at intel.com>
> Reviewed-By: Eugeni Dodonov <eugeni.dodonov at intel.com>
> Signed-off-by: Keith Packard <keithp at keithp.com>
>
> -----------------------------------
>
> I'd be happy to provide more information and/or test any patch that would
> help solve this problem,
Thanks for the report... do you also have:
commit 7a4198664d46b87025a64530f1530ab2bea54c19
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date: Tue Nov 15 10:28:53 2011 -0800
drm/i915: don't disable a PCH DPLL that's in use
commit d8e70a254d8f2da141006e496a51502b79115e80
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date: Tue Nov 15 10:28:54 2011 -0800
drm/i915: only set the intel_crtc DPMS mode to on if the mode set succeeded
in your tree? Those are needed to fix some 3 pipe related bugs.
--
Jesse Barnes, Intel Open Source Technology Center
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