Have been running dual displays for nearly 20 years now. Hard to give up that habbit
Purchasedd a pair of excellent crossover branded IPS displays (2560x1600 pixels) with only dual-link dvi inputs (1/3 the price Dell/HP/apple sell them direct ebay from South Korea). No scalar asic, but outstanding display quality and helpful to me (double vision < 1 meter distance due to injury). Key term in finding the best was "perfect pixel" and carefully reading each vendor's definition Happy to recommend vendor to anyone interested in similar. Vendor very helpful and LCD's arrived within 5 days of placing order.
Formerly ran a single ATI (before that, a decade of nvidia...) 7750 radeon which drove two older LCDs (hdmi & displayport) with ati-drivers, "single" desktop. under kde, roll around the cube effect, both windows roll, and could drag programs between screens.
New install (due to mandatory 2x dual link dvi) I snagged good deal on pair of 7850 radeons. Each has only one dual link dvi. Performance is impressive
Desktop broken into two separate screens. thus, no dragging windows from one side to the other. Re-configed KDE to put another toolbar, etc on second monitor. Each acts independently.
Now, question for the hardcore video card/opengl/ati-drivers guru When I tried going back to xinerama (versus the failed "amdcccle -- one big desktop", option now missing), KDE 3d effects dissappear. No cube, etc. scoured the web for answers, and found similar folks with libglu and glxinfo problems (and "unknown" 3d accelerator in kinfocenter in the OpenGL listing. all other info points correctly to the AMD/ATI HD 7800 series for rendering and opengl/ES version). Items like glxgears work perfectly, and quite fast with the new card(s), as do the few 3d games I've tried (all single screen).
Verified and performed all the "eselect opengl set ati" , kernel, opencl, bzimage, etc with no luck.
Would like to return to full 3d "one big desktop" as seen with single video card. Tried enabling crossover (didn't work? Didn't help?).
I'm guessing $100+ for an active displayport to dual link DVI connector might do the trick, but that's yet more $$ I'd prefer not to spend since I already have a ton of hardware.
I also did
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equo install --empty kde-meta
just to be sure. Running out of tests and ideas.
Anyone else seen such behavior? Or am I asking too much to enjoy what worked with a single card last week If not, I'll get used to it of course...