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Old 04-19-05, 11:33 AM   #1
silentplummet
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Default VT switching, garbled console, etc. FIXED!!

Well it seems I fixed the problem that's been plaguing me for half a year now; I can now restart X, switch to vts, and no garbled console at all.

I toggled the following options in my BIOS (Abit A7N, GF5900FX, NVAGP)

AGP Spread Spectrum: OFF (was 50%)
AGP Rate: 4x (was 8x)
AGP Fast Writes: OFF (was ON)

And this seems to have fixed whatever it is. You Doom3 nuts aren't gonna like the fix (hesitate to call it a "solution"); I don't even care about the reduced performance, but if you are suffering from this bug, try these steps to remedy it! I'm going to go test console framebuffer mode now.

I still have weird graphical corruption on the second monitor in the left orientation, but it's liveable now that I can kill X without restarting my computer.
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Old 04-19-05, 04:06 PM   #2
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Default Re: VT switching, garbled console, etc. FIXED!!

Nope, framebuffer console still borked. I couldn't even quit X before it locked up on me. This is quite sad.
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Old 04-20-05, 04:00 AM   #3
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Lightbulb Re: VT switching, garbled console, etc. FIXED!!

Forum member Sothoth posted the following solution for this problem:
Quote:
Originally Posted by Sothoth
The solution was to add a line:

Option "IgnoreDisplayDevices" "TV"

into the corresponding Section "Device", as I read in this forum.

Thanks a lot for all!

P.S.: Why it solves the problem?
It seems that once the proprietary nvidia module is loaded, TV-out support is enabled, which makes for some seriously crazy refresh rates for the VT in some setups with some cards. If you ignore the TV devices (read: ultra-low refresh rates), the problem goes away.

For posterity, my buddy just had the same problem you are. He's got a NV6200, and his VTs were severely mangled after the nvidia module would load (but not before). I have almost exactly the same setup on my own system as he does (nearly identical kernel, exact same mobo) except I have an FX5900, and I have never experienced the same issue. I have no idea what caused his to freak out and not mine, but it was consistent. In any case, this fixed it for him and I hope this does it for you too.

-AT

P.S. - Cheers Sothoth, and any other contributors!
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Old 04-20-05, 05:01 AM   #4
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Default Re: VT switching, garbled console, etc. FIXED!!

I have had this problem with all nvidia cards with tv-out enabled (twinview). Without boot parameter vga=xxx the consoles are however fine. (It would be nice to use graphical boot theme etc.)

Last edited by someonex; 04-21-05 at 12:52 AM.
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Old 04-22-05, 12:54 AM   #5
silentplummet
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Default Re: VT switching, garbled console, etc. FIXED!!

I've had the IgnoreDisplayDevices line in my xorg.conf for months. Unfortunately I didn't notice any effect on the problem using that.
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Old 04-22-05, 10:00 AM   #6
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Default Re: VT switching, garbled console, etc. FIXED!!

Are you people using VESA as the framebuffer?, that rivafb tends to do that even as a module. I've not seen this issue when compiling my own kernel but have seen it when testing Ubuntu. Slackware and SuSE I've never seen the issue.
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Old 04-22-05, 01:16 PM   #7
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Default Re: VT switching, garbled console, etc. FIXED!!

specifically vesafb-tng
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Old 04-22-05, 05:26 PM   #8
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Default Re: VT switching, garbled console, etc. FIXED!!

Hi,

>AGP Spread Spectrum: OFF (was 50%)

what do you expect? Spred Spectrum means 'smeared' signals, no wonder, you had probs... for best compatibilty and performance, it is wise to deactivate every form of 'spread spectrum' in the bios.
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