Bug 28212

Created attachment 35796 [details]
dolphin_screenshot

Created attachment 35797 [details]
dmesg

Using compiz ? If yes, does it affect the results ?

Xavier: This is the kind of corruption I also get. So there are at least three of us having this issue.

My exams are almost over, next week, I'll be free to dig into this problem once for all (hopefuly).

This looks like a typical tiling corruption, the question is, where does it happen?

okias: Can you try to activate the image preview in dolphin ?

If all you get is scrambled thumbnails, then, you have found a good way to reproduce this issue.

Now, let's find what's happening.

In short: I don't have composite enabled and dolphin have previews enabled:
1a) enabled: in icon area (corrupted image)
1b) disable: normal mime icons
2) on right side - image is correct

it's 100% repeatable.

After while some others image (icons in systray, plasma widgets icons) gets damaged.

Okias: OK, we have the exact same behaviour. That's great.

I'll try to work on it this week end, I'll keep you updated ;)

Xavier: To fix this issue, should I try to create a minimum test-case or should I just dig into the source code and see if somewhere a memcpy is happening where it should not (by adding some errorF everywhere near memcpy statements) ?

Heh don't ask me, ask any of the people that actually have a clue like Maarten or others on IRC :)

Did you link this corruption with nouveau_exa_download_from_screen or nouveau_exa_upload_to_screen that you mentioned several times ? The fallback to memcpy-based transfer there ?

You could enable NOUVEAU_FALLBACK in nouveau_local.h , and then add a few ErrorF or NOUVEAU_ERR in strategic places to see if you can link the corruptions with some code path.
But I don't know if that's a good idea and approach to the problem.

No, the fallback is not happening here, sadly. The GART-based transfer always succeed.

So, the problem is elsewhere. I'll drop a line on IRC to see if someone has a clue!

Thanks anyway :)

Created attachment 36964 [details]
dmesg log

Created attachment 36965 [details]
Xorg log

Created attachment 36966 [details]
Messages output

Hi! I'm having the same problem (while surfing the web / running KDE 4.4.5 or everything else) and I tried running with drm.debug=1 nouveau.reg_debug=0x200 in my kernel options.

I've attached the dmesg / Xorg.log and messages output.

[messages contains an old boot before debug was enabled!]

I needed to gzip the messages output due to being 23 MB big...

I hope this helps. If there is anything else needed, just tell me what I should do and I'll give my best.

lspci -v prints this:
01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9600M GS] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Wistron Corp. Device 208c
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at f2000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at f0000000 (64-bit, non-prefetchable) [size=32M]
        I/O ports at 2000 [size=128]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidiafb

With the latest xorg-edgers version (1.8.2 build 01.07) I have similar problems (icons in taskbar, skype icon in tray, opera menus, all get corrupted).

Would it help if I upload additional logs?

lspci: 01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9600M GT] (rev a1)

uname: Linux lhart 2.6.35.3-hartlite01 #1 SMP Sat Aug 21 09:00:29 EEST 2010 i686 GNU/Linux

sounds like this:
http://lists.freedesktop.org/archives/nouveau/2010-August/006206.html

which is not nouveau bug :)
http://lists.freedesktop.org/archives/nouveau/2010-August/006213.html

I guess it was fixed long time ago. I can't reproduce it, because I do not have nvidia laptop.