Possible EGL bud with Snapshot 20160511

After I dd my zypper dup today, an odd thing heppened after login to the Plasma5 desktop.

  • I can see my panel, but no other widgets
  • The background is the SDDM splash screen
  • I cannot change the background

After poking around, I found that if I disable the compositor, my normal background and widgets appear. I was running OpenGL 3.1 and changed it to 2.0. After a reboot, the issue persisted. I changed to GLX from EGL, and the roblem disappears, whether or not I use OpenGL 2 or 3.1.

Output of lspci

00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:04.0 Signal processing controller: Intel Corporation Broadwell-U Processor Thermal Subsystem (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)

Anyway, I have a work around. Is there more information I would need to open a bug report?

Using EGL as kwin’s compositing backend is (still) not recommended at this point AFAIK.
Not all drivers even support it satisfactorily yet I think.

So switching to GLX is actually not a “workaround”, but what you should do, and actually GLX is the default.

Though, it seems Wayland will require EGL…