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I'm using Fedora 10, nvidia legacy drivers, twinview dual monitor setup. My left monitor keeps blinking to black. My right monitor is behaving 100% perfectly. This just started today (or at least today's the first time I ever noticed it. Sometimes it'll go minutes without blinking and something it'll blink three times in 3 seconds. I swapped out the VGA cable and it's still happening. I also dusted out my computer today, so it's not dust on the graphics card.
How can I figure out if it's happening because of the drivers? Or some kernel upgrade or something like that. Of course, I still have to try another monitor in its place to see if it's the monitor.
To be clear, the power isn't going off, the screen just turns black and my right monitor somewhat blinks as if Linux is saying - switch to just using this monitor. Then it goes back to displaying what it should be.
I deleted my xorg.conf and rebooted. Fedora 10, like Ubuntu 8.x will automatically generate a new xorg.conf for you. Unfortunately, it only generated a one-monitor xorg. So far it appears to be working sans flickers. So, thankfully (money-wise), it's just a software issue. I will post my old/new xorgs in case someone can offer up a suggestion. Also, I will try nvidia's generate an xorg.conf feature to try and bring back twinview.
the only thing i can think of would be add a few lines to the old xorg.conf
# and with two screen sections these go here
VendorName "NVIDIA Corporation"
BoardName "GeForce FX 5500"
Option "AddARGBGLXVisuals" "True"
Option "UseEvents" "False"
Option "RenderAccel" "True"
Option "AllowGLXWithComposite" "True"
Option "NVAGP" "3"
OK, before switching to your options I tried glxgears again; mysteriously, glxgears is now reporting in the 1400 fps range.
However, with your options, my situation isn't any better.
I did notice something I forgot to mention. Previously, both my monitors would be at the same resolution. Right now my right-most monitor (the one that doesn't flicker) is at 800x640 or something huge like that. They don't match up anymore. I wonder if that's a clue as to what's going wrong?
Also, if I leave it flickering for too long, it dumps me back to GDM - I guess basically the graphics driver is crashing.