Black Screen on Login

[Bhushan Shah]

Okay people, I reported this bug on bugzilla

https://bugs.kde.org/show_bug.cgi?id=342431

On Sat, Jan 3, 2015 at 3:47 AM, Aleix Pol <aleixpol at kde.org> wrote:
> 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
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-- 
Bhushan Shah

http://bhush9.github.io
IRC Nick : bshah on Freenode