Bug 356263

Summary: Desktop wallpaper doesn't display on KDE login when using OpenGL v3.1 with EGL on Intel cards
Product: [Plasma] kwin Reporter: Xavion <Xavion.0>
Component: eglAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: minor CC: Xavion.0
Priority: NOR    
Version First Reported In: 5.4.3   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: My "SDDM" Desktop
KDE's "Compositor" Settings

Description Xavion 2015-12-04 01:36:30 UTC 
Within KDE's "Compositor" settings, I've got the "rendering backend" set to OpenGL v3.1 and the "OpenGL interface" set to EGL.  When I log out of KDE and log back in again, I notice that my desktop wallpaper doesn't display.  Instead, I still see SDDM's "login progress" screen.  I have tried this several times and the result is always the same.

If I set the "OpenGL interface" (back) to GLX, my desktop wallpaper instantly shows up (again).  Furthermore, it displays as expected after logging out and logging back in to KDE (each time).  I'm using "v1:2.99.917+478+gdf72bc5-3" of Arch Linux's "xf86-video-intel" package.  I will attach a couple of screenshots to illustrate my point shortly.

Reproducible: Always
Comment 1 Xavion 2015-12-04 01:38:16 UTC 
Created attachment 95889 [details]
My "SDDM" Desktop
Comment 2 Xavion 2015-12-04 01:39:00 UTC 
Created attachment 95890 [details]
KDE's "Compositor" Settings
Comment 3 Martin Flöser 2015-12-04 07:03:03 UTC 
With Intel I recommend to use OpenGL2+GLX. EGL doesn't work properly if you don't also enable DRI3.
Comment 4 Thomas Lübking 2015-12-04 08:27:44 UTC 
This rather looks like plasmashell doesn't start?
=> Do you have a "plasmashell" process running when this happens?

intel+DRI2 is bug #338150, but there's no panel and the kwrite window shows nicely on top...
Comment 5 Xavion 2015-12-04 20:52:42 UTC 
@ Martin:
Thanks, enabling DRI3 fixed the problem.  Why don't they just use it as the default?

@ Thomas:
My main panel is set to "auto-hide" mode.  The "plasmashell" process was running.
Comment 6 Thomas Lübking 2015-12-04 20:55:32 UTC 
(In reply to Xavion from comment #5)
> My main panel is set to "auto-hide" mode.
Ah, ok. Just a guess ;-)

*** This bug has been marked as a duplicate of bug 338150 ***