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Old 12-05-08, 08:37 PM   #1
jason.houston
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Default 180.11 Image Banding -- Running in 16-bit color?

After testing the 180.11 drives on Ubuntu 8.10 with latest patches, I see image banding in 24-bit color images and in the current version of the Second Life viewer. For example, the attached 24-bit color test image has obvious vertical banding when viewed with the 180.11 driver. 177.82 displays all images and applications normally. Is it possible the 180.11 driver isn't actually displaying 24-bit color on my laptop panel, although it does report 24-bit color?

180.11 doesn't seem to cause me any instability problems and it appears to be quite fast, especially with Compiz, but the banding issue keeps me from using it daily.

I have attached the nvidia-bug-report results as well.
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Old 12-05-08, 11:50 PM   #2
bearoso
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

You're definitely not getting 24-bit color. Very few laptops can actually do 24-bit color because nearly all use TN panels. What you're probably experiencing is a gamma change that modifies the profile of the bands to make them more noticeable to your eye.

Something I can suggest that might help would be to open nvidia-settings and in the "X Server Color Correction" section, hit "Reset Hardware Defaults". If that doesn't change anything, you can try to tweak the settings, or maybe wait for a nvidia developer to say something about the new driver reading gamma from monitor EDID differently.
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Old 12-06-08, 02:12 AM   #3
jason.houston
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

Yeah, I had tried resetting to hardware defaults and tweaking the gamma in color correction, it didn't seem to help. It seems like it would be a tweak of some kind to take care of the problem but I haven't found it yet if so.
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Old 12-15-08, 04:49 PM   #4
mini
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

I can confirm this issue - my whole desktop is completely different since I installed the 180 series drivers on my Ubuntu Jaunty - banding everywhere. And I'm 100% sure I didn't see this before with the 177 drivers.

Edit: log attached
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File Type: log nvidia-bug-report.log (122.4 KB, 151 views)
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Old 12-16-08, 03:21 PM   #5
jason.houston
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

Yeah, I have the same problem with the recently released 180.16 beta too.
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Old 12-18-08, 07:29 AM   #6
mini
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

Eh, ok, now the problem disappeared, and I don't know why. I didn't upgrade my system. This is too strange. I now have a smooth 24bit (as far as i can tell) display again.

Maybe the problem disappeared after a suspend, actually. Anyone on a laptop that can confirm that?
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Old 12-18-08, 01:11 PM   #7
davelaser
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

I get this problem also, serious colour banding with the entire 180.x series up to and including 180.16.

I'm fairly certain it isn't an issue with the monitor because it used to work fine with the older 177.x series. Colour correction is set to hardware defaults as well.

Sam
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Old 12-18-08, 06:38 PM   #8
jason.houston
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

mini, believe it or not, a suspend/resume fixed the problem for me as well. I wonder if this is related to the video card? I have a Dell Inspiron 9400 with the GeForce Go 7800.
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Old 12-19-08, 07:55 AM   #9
scalpel4k
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

same here, although I realized I only have the above mentioned issues when running compiz. Starting a session with kde4-kwin colours are fine.
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Old 12-19-08, 09:48 AM   #10
jason.houston
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

Another interesting thing...if I suspend/resume to fix the color, afterward if I switch between Compiz and Metacity then the color banding is back. So the suspend "fix" is only temporary for me.
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Old 12-21-08, 05:14 PM   #11
oyvind
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

Seeing the same problem here, starting with 180.16 on an GeForce 6600 Go. For instance gradient backgrounds makes my desktop look like an old Nintendo game. It all feels very 16-bit, even though everything else indicates 24 bit depth. It's not a monitor problem, because this laptop also has a built-in Intel graphics card (switchable at boot time), and when using that the graphics are all fine and a lot smoother.
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Old 12-27-08, 07:02 PM   #12
polpodan
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Default Re: 180.11 Image Banding -- Running in 16-bit color?

I do have this problem with 180.18 driver using Arch Linux and a GeForce 7600. The suspend "fix" works, but after some time, the display switch to 16 bit even if it's still indicate 24 bits.
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