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I'm having an issue with what I think is KDE4. I'm running a dual-screen setup. Both screens are functional before KDE loads, at shutdown, and while running Windows, but while KDE is running only 1 screen is functional at a time. Normally, the screen connected to the HDMI-port on my graphics card is non-functional. It still exists, I can take screenshots of it, I can move windows there, but it doesn't get signal from my graphics card. It started after both a full system upgrade and installing Steam and reinstalling lib32-mesa-dri (already on the system for Skype). I can find the logs if you're interested.
The screens are connected through the HDMI (normally black) and DVI (normally working) ports of a Radeon HD 7950, and I use open-source drivers.
Things I've tried:
* System settings in KDE. If I disable the HDMI-connected screen and then restore previous configuration, the active screen switches. The screen that used to be black now works, and the screen that used to work is now black. After a reboot they switch back to the usual configuration. I cannot "apply" this configuration, so for KDE it is the same as the "normal" one.
* Removing and reinstalling Steam. No dice.
* Removing and reinstalling KDE. After removing and rebooting, the screens are in duplicate mode, as expected. On reinstalling KDE4, the issue returns.
* Removing and reinstalling the open-source Radeon drivers. Issue persists even when removed and rebooted.
The only thing I can think of that I haven't tried is messing with KDE config files, but I don't know anything about those and I'd rather not screw it up more. I'm probably missing something really simple, so I'm hoping you can point me in the right direction. Googling and searching this forum did not return anything useful.
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