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Having just "upgraded" to KDE5, I'm having some issues getting my old configuration to work. Here are the symptoms:
Primary monitor functions properly.
Secondary monitor has output from X-windows (cursor, etc.), but not from Plasma.
glxgears runs on both monitors.
Applications run properly on the second monitor when forced there by X, but Kwin crashes if I try to adjust any window sizes.
Window decorations on the second monitor appear to match what I have set for Plasma.
Xrandr does not show the second monitor.
The KDE system settings utility only shows a single monitor
A full system update has been conducted.
The primary monitor is running on an older Nvidia card, using the proprietary driver and mesa-libgl (also worked with nvidia-libgl)
The secondary monitor is running on the motherboard's integrated ATI graphics, using the radeon driver.
This dual-monitor configuration was working properly for ~3 years prior to the most recent system update.
Any thoughts?
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