Black Screen on Login

[Aleix Pol]

On Fri, Jan 2, 2015 at 6:14 PM, Lukáš Tinkl <lukas at kde.org> wrote:
> Dne 2.1.2015 v 16:47 Aleix Pol napsal(a):
>
>> On Fri, Jan 2, 2015 at 4:41 PM, David Edmundson
>> <david at davidedmundson.co.uk> wrote:
>>>
>>>
>>>
>>> On Fri, Jan 2, 2015 at 4:30 PM, Aleix Pol <aleixpol at kde.org> wrote:
>>>>
>>>>
>>>> On Fri, Jan 2, 2015 at 4:23 PM, David Edmundson
>>>> <david at davidedmundson.co.uk> wrote:
>>>>>
>>>>> I have a new theory as to what might be wrong.
>>>>>
>>>>> With KScreen's backend being out of process it could be signalling that
>>>>> there's a new screen before plasmashell has processed the X events and
>>>>> be
>>>>> trying to look for the relevant QScreen object before plasmashell has
>>>>> made
>>>>> it.
>>>>>
>>>>> Could someone put in some debug on shellcorona.cpp:851 before it
>>>>> returns
>>>>> a
>>>>> nullptr in ShellCorona::outputToScreen and see if that gets triggered.
>>>>>
>>>>> You may need to use printf() as plasmashell has this somewhat odd
>>>>> --shutup
>>>>> mode that suppresses all qDebug in an effort to make fixing this as
>>>>> difficult as possible.
>>>>
>>>>
>>>> My theory, is that ::load is not being executed though. Otherwise we'd
>>>> be seeing things when this happens, instead of just a black screen.
>>>
>>>
>>>
>>> I'm back to thinking you're right.
>>> load would call addOutput. addOutput would assert if outputToScreen
>>> failed.
>>>
>>> With the exception of being completely 100% wrong, it was a good theory.
>>
>>
>> I appreciate a good theory. <3
>>
>> I just added a warning that will output something if the
>> GetConfigOperation fails.
>>
>> All those of you who can reproduce it, should rebuild and run again.
>> Maybe we'll see the answer there.
>
>
> Can you update to the most recent powerdevil and try to reproduce the black
> screen problem again? My theory is that there lies the problem; plasmashell
> is starting up and requesting the config while kded is (also) waiting for
> plasmashell to show up (because of the notifications it wants to display).
> Eventually the dbus calls time out, plasmashell start but as there is no
> config, you just get a black screen.
>
> After updating powerdevil, I can no longer reproduce this; kscreen is broken
> in a different way (doesn't apply the config) but that's another story
>
I can't reproduce myself, that's why I just added debug information...

Aleix