On Mon, Mar 18, 2013 at 9:59 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Mon, Mar 18, 2013 at 8:35 PM, St?phane Marchesin
> <stephane.marchesin at gmail.com> wrote:
>>
>>> For starters I guess we need:
>>> - drm.debug=0xe dmesg from just before that commit
>>> - same for latest 3.9-rc kernels, presuming it's not broken there
>>>
>>> Latest upstream has a minor chance to work better I think since we've
>>> improved the pfit handling in the setup and teardown sequence a bit.
>>>
>>> Generally lvds has been hit&miss on way too many machines
>>> unfortunately with things randomly breaking and getting fixed again
>>> (e.g. one of Chris' machines works again with the new code ...). And
>>> the commit above doesn't really change much in the code itself but it
>>> does change the order (and timing) of the different enable/disable
>>> codepaths.
>>
>> So I did look at the thing a bit, and it triggers the workaround
>> if (INTEL_INFO(dev)->gen < 4 && !intel_check_plane_mapping(crtc)) {
>> which seems to be part of the problem (but not the whole problem as
>> removing that gets me a corrupted display, looks like the second pipe
>> stays enabled then).
>
> Well, that particular piece of lore took a few trials to get right.
> Can you please attach a drm.debug=0xe dmesg of the entire boot on
> latest kernels?
Also, anything in particular standing out in intel_reg_dump output on
working/broken kernels?
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
