Scond Monitor Completely Broke KWIN

Using Enigma on a vanilla HP laptop with INTEL video. Everything has worked beautifully since installation – since about a month ago. Today, I hooked up a second monitor for testing. I’ve since disconnected it, but now, KWIN, OPENGL, compositing, QT graphics (whatever it is) is completely broken. Window effects stagger. There’s severe tear out. The system is unusable – as if there were a hemorrhaging memory leak. I’ll have to re-in…

Oh…

As I was writing this, I seem to have solved the problem? Under System Settings:Size & Orientation, I checked “Unify Outputs” as a sort of Hail Mary. It worked??? Now it’s unchecked again, but everything still works. Not sure what’s going here? If I go to Workspace Appearance:Desktop Effects, and play around with Raster verses Native (QT Graphics System), it claims that some 22 Desktop Effects don’t work, but they’re all working.

Seems to be some kind of BUG?

Anyway, here are the specs. I may file a bug report…

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 02)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
05:08.0 Ethernet controller: Intel Corporation PRO/100 VE Network Connection (rev 02)
05:09.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
05:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)
05:09.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a)
05:09.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05)

It might be that if you just plug out the cable the display was still active in the settings. This could explain the problem. Before KDE SC 4.11 this was the normal behavior.
With kscreen and 4.11 it should automatically turn off this monitor as well.

The effects notification on changing from native to raster or vice versa is indeed a bug.

Agreed. I did unplug the monitor without turning off the system. That said, I had turned off the external monitor and it wasn’t registering in settings. Still…

The behavior is odd. After checking 'Unify Outputs", the checkbox reverted to its unchecked state. Probably, as you say, the software was behaving as though there were still two monitors (even though this information wasn’t displayed). Unifying the monitors had the effect of resetting the display settings. Once that was done, it unchecked the ‘Unify Outputs’ option because, as far as the software was concerned, only one monitor was present.