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Old 06-13-2015, 08:49 PM   #1
eantoranz
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kde (debian testing): screen goes dark when kde starts


Hi!

I've been having problems since this afternoon with kde. It all started when my session stopped working after I had left my computer with my kde session working to go to launch. Just so you know, I use xscreensaver (start with with a desktop file in .kde/Autostart/. I moved it out of there to make sure it wasn't the cause. The problem is still there). When I came back the session was not responding at all (dark screen and stuff.... a lot of latency, etc) so, after a lot of trying to start/restart kdm unsuccessfully on a VT, I just gave up and restarted the computer. Boot goes normally but when I start the kde session I start to see the splash screen and then it goes absolutely dark. A lot of processes start if I check on a VT. Can even start amarok by using the play button so it's obvious kde is actually there but I just can't see a single thing. Also, I tried using the brightness buttons but they provided no visible change. As a test I just created a 'guest' account to make sure it works and it's good (even brightness buttons work correctly). That's how I'm writing this thread.

What could be the cause of this behavior?
 
Old 06-13-2015, 09:24 PM   #2
eantoranz
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I was testing how to get kde to start 'by hand' to see what could be broken. I was able to go into an almost full normal session (with some glitches, for example, no window decorations nor other things) by starting X manually with '-listen tcp' option, then starting konsole from another VT (exporting DISPLAY) and then calling plasma-desktop from konsole. I'll try starting kde now from kdm to see if the behavior is still there. Wait for the update.
 
Old 06-13-2015, 09:30 PM   #3
eantoranz
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Same thing. Screen went black when starting to show splash screen. Is there a place where the 'current brightness' is set when kde is started? Maybe some global values related to screen brightness are broken in the configuration?
 
Old 06-13-2015, 09:58 PM   #4
eantoranz
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Ok... was able to start my session 'manually'. I started X manually (with -listen tcp) option enabled from a VT, then on another VT I exported DISPLAY and ran startkde (and it's my full blown session, nothing missing). This is where I am at the moment. But something tells me that if I try with KDM, it's going to fail as well. Wait for the update.
 
Old 06-13-2015, 11:04 PM   #5
eantoranz
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I must have done something different that time because from kdm it's always going to a black screen and then I tried again going with the manual recipe and I got the same result.

What I'm noticing is that when I run manually I get to see the brightness bar when the splash is showing up right before the screen goes dark and then, bam, black screen. I'm sure it's some configuration problem. I just don't know where or what to look at. I searched for 'bright' in all of .kde and the only file I found with something related (powermanagementprofilesrc) is exactly the same between my normal user and my current guest account.

I found this article and it looks interesting. It says that krunner can set whatever brightness it pleases to but then I checked krunner configuration file and found nothing special:

Code:
[EdgePositions]
Offset=0.5

[General]
PastQueries=,gkrellm

[Interface]
Size=420,500

[PlasmaRunnerManager]
LaunchCounts=1 shell_gkrellm
I see some small differences between this file and the guest's. I see no relation but I'll adjust the file and see if it makes any difference.

Anyone wants to jump on board with some idea?
 
Old 06-13-2015, 11:05 PM   #6
eantoranz
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The article: http://askubuntu.com/questions/15016...tment-interval
 
Old 06-13-2015, 11:35 PM   #7
eantoranz
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Ok.... I compressed in a tarball the .kde directory and removed it. Started the session and I'm back on track so it's definitely something on kde configuration. I won't spend more time on it for now... I'll just set up my desktop to how it was until someone comes up with an idea to try.
 
  


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