Nouveau - Sep 2012 - [Bug 54587] New: Flickering screen on Geforece 4

https://bugs.freedesktop.org/show_bug.cgi?id=54587

             Bug #: 54587
           Summary: Flickering screen on Geforece 4
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: piip at mail.com
         QAContact: xorg-team at lists.x.org


I have Geforce 4 display adapter. I updated Ubuntu from 10.04 LTS to 12.04.01
LTS. I was using proprietary Nvidia driver with 10.04. Now it is no more
supported with 12.04. Also NV driver is not supported. I try to use Nouveau,
but my screen flickers so badly that it is not usable. I am using the same
resolution and refresh rate as with 10.04. I have to continue using 10.04 until
this bug is fixed. I am not alone with this problem. Read this description:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/575092

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--- Comment #1 from Marcin Slusarz <marcin.slusarz at gmail.com>
2012-09-06 17:45:48 UTC ---
Linked bug report contains kernel logs from ancient version of nouveau. Please
attach complete kernel log (as obtained by dmesg command) from the latest
possible kernel.

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--- Comment #2 from Vesa <piip at mail.com> 2012-09-07 12:02:22 UTC ---
Created attachment 66783
  --> https://bugs.freedesktop.org/attachment.cgi?id=66783
Dmesg outout

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--- Comment #3 from Vesa <piip at mail.com> 2012-09-07 12:03:51 UTC ---
Created attachment 66784
  --> https://bugs.freedesktop.org/attachment.cgi?id=66784
Screen 1

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--- Comment #4 from Vesa <piip at mail.com> 2012-09-07 12:05:23 UTC ---
Created attachment 66785
  --> https://bugs.freedesktop.org/attachment.cgi?id=66785
Screen 2

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--- Comment #5 from Vesa <piip at mail.com> 2012-09-07 13:19:30 UTC ---
This flickering is very strong when I move a window. Some interference can be
seen when I move mouse. Screen is stable when nothing changes in screen.

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--- Comment #6 from Marcin Slusarz <marcin.slusarz at gmail.com>
2012-09-07 19:17:51 UTC ---
Does it work if you boot with video=TV-1:d in kernel command line?

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--- Comment #7 from Vesa <piip at mail.com> 2012-09-08 09:34:48 UTC ---
This kernel option reduced interference.

At 1024x768:
- no interference when the screen changes
- occasionally the screen trembles quickly at 10 seconds interval
- leftmost part of the screen shows in the right side 

At 1920x1080
- moving a window causes snow
- constant quick trembling at 10 seconds interval
- horizontally the screen is ok

In both cases
- bottom of the screen is missing
- vertically the screen seems to be off position about on line down. For
example in menus mouse pointer selects the item below.

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--- Comment #8 from Marcin Slusarz <marcin.slusarz at gmail.com>
2012-09-08 13:25:28 UTC ---
Do you use xorg.conf? If yes, please remove it and recheck.
Periodical flickering might disappear with drm_kms_helper.poll=0 in kernel
command line.

After you do the above, please attach:
- new dmesg
- Xorg.0.log
- vbios (see http://nouveau.freedesktop.org/wiki/DumpingVideoBios - nouveau
wiki is unavailable today, but you can find old copy of this page on
archive.org / google cache)

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--- Comment #9 from Vesa <piip at mail.com> 2012-09-09 05:45:14 UTC ---
Created attachment 66864
  --> https://bugs.freedesktop.org/attachment.cgi?id=66864
New dmesg output

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--- Comment #10 from Vesa <piip at mail.com> 2012-09-09 05:46:12 UTC ---
Created attachment 66865
  --> https://bugs.freedesktop.org/attachment.cgi?id=66865
Xorg log

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--- Comment #11 from Vesa <piip at mail.com> 2012-09-09 05:47:23 UTC ---
Created attachment 66866
  --> https://bugs.freedesktop.org/attachment.cgi?id=66866
VGA ROM

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--- Comment #12 from Vesa <piip at mail.com> 2012-09-09 05:54:03 UTC ---
I had xorg.conf because Ubuntu display settings did not offer the correct
resolution for my monitor (1920x1080). Removing it did not help. Removing
polling worked. See attached photo of the monitor and notice the wrong position
of the screen and difference in mouse pointer and focus.

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--- Comment #13 from Vesa <piip at mail.com> 2012-09-09 05:55:27 UTC ---
Created attachment 66869
  --> https://bugs.freedesktop.org/attachment.cgi?id=66869
Photo of my monitor

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #66865|text/x-log                  |text/plain
          mime type|                            |

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |currojerez at riseup.net,
                   |                            |marcin.slusarz at gmail.com

--- Comment #14 from Marcin Slusarz <marcin.slusarz at gmail.com>
2012-09-09 21:15:01 UTC ---
Quite unlikely, but maybe you can fix it with cvt / xvidtune. 
Other than that I have no idea how to proceed. Let's CC curro.

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--- Comment #15 from Vesa <piip at mail.com> 2012-09-10 11:36:56 UTC ---
I tried to move screen position with xvidtune but it did not allow. I took
xvidtune -show in my current well working Ubuntu 10.04 setup:

"1920x1080"   148.50   1920 2008 2056 2200   1080 1084 1089 1125
+hsync +vsync

I set exactly like this in Ubuntu 12.04 modeline. Still there is a grey block
above the top of the screen and missing lines at the bottom. The mouse cursor
and focus does not sync. Snow when scrolling window contents and even when the
mouse pointer has a waiting animation on. Horizontally the screen is fine.

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--- Comment #16 from Marcin Slusarz <marcin.slusarz at gmail.com> ---
Please test both resolutions with compositing disabled.

Can you see those problems on VT with both resolutions? (you can force
resolution by appending video=VGA-1:WIDTHxHEIGHT on kernel command line, see
http://nouveau.freedesktop.org/wiki/KernelModeSetting for details)

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--- Comment #17 from Vesa <piip at mail.com> ---
I was not able to get any better results. I do not expect any simple trick to
get this adapter work well. I think you should get Geforce 4 and code/test
yourselves. 

In the meantime, NVidia has recently released a new and final official driver
version 96.43.23 for X.Org xserver versions 1.11 and 1.12. I hope Ubuntu
distribution will soon include it. 
http://www.nvidia.co.uk/object/linux-display-ia32-96.43.23-driver-uk.html

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--- Comment #18 from Vesa <piip at mail.com> ---
I installed directly NVidia 96.43.23 driver and it works well at full
resolution. It conflicts with Nouveau so I have to use
"nouveau.modeset=0" in
kernel boot parameters.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Flickering screen on        |[NV1F] Flickering screen on
                   |Geforece 4                  |Geforece 4

--- Comment #19 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Your logs are from very old versions of nouveau. Does this still happen with a
recent kernel (e.g. 3.13.x)?

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--- Comment #20 from Vesa <piip at mail.com> ---
Created attachment 93641
  --> https://bugs.freedesktop.org/attachment.cgi?id=93641&action=edit
Photo

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--- Comment #21 from Vesa <piip at mail.com> ---
Created attachment 93642
  --> https://bugs.freedesktop.org/attachment.cgi?id=93642&action=edit
Dmesg

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--- Comment #22 from Vesa <piip at mail.com> ---
Created attachment 93643
  --> https://bugs.freedesktop.org/attachment.cgi?id=93643&action=edit
Xorg log

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--- Comment #23 from Vesa <piip at mail.com> ---
I updated to Ubuntu 13.10. Very much flickering. See attached photo and log
files.

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--- Comment #24 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #23)
> I updated to Ubuntu 13.10. Very much flickering. See attached photo and log
> files.
Is using a digital connector an option? I wouldn't be surprised if things
got
better if you did.

Are you manually adding the 1920x1080 modeline? Do lower resolutions work OK?

What happens if you use Marcin's old suggestion of booting with video=TV-1:d
?

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--- Comment #25 from Vesa <piip at mail.com> ---
There is no digital connector available. This is ten years old mother board
with integrated graphic adapter :)

Adding video=TV-1:d removes most of the interference.

At 1920x1080 (monitor native resolution) there are still some odd lines here
and there, moving a mouse increases interference and moving a window makes the
screen very wild. I am not sure where I got this resolution, maybe from
nvidia's driver.

At 1024x768 the screen is stable if mouse is not moved, moving a window causes
interference, a few lines at the top of the screen are missing.

At 800x600 the screen is stable even when moving a mouse, moving a window
causes some odd lines to appear.

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--- Comment #26 from Vesa <piip at mail.com> ---
I noticed that traffic with hard disk causes big interference! Even when
nothing changes in the screen.

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--- Comment #27 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #26)
> I noticed that traffic with hard disk causes big interference! Even when
> nothing changes in the screen.
This makes it really sound like you're having analog isolation issues. Does
your VGA cable have a ferrite core on it? (Here's an image of what I'm
talking
about:
http://image.made-in-china.com/2f1j00cSjErnoMZtkg/VGA-Computer-Monitor-Cable-with-Ferrite-Cores-Hdb15m-Hdb15m.jpg
-- the things on the cable that aren't the connector itself.)

Did you not see these issues with the nvidia binary driver? That'd be very
surprising...

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--- Comment #28 from Vesa <piip at mail.com> ---
Created attachment 93694
  --> https://bugs.freedesktop.org/attachment.cgi?id=93694&action=edit
Photo of lines

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--- Comment #29 from Vesa <piip at mail.com> ---
My VGA cable has ferrites on both ends and connectors are well secured. I have
not seen this problem with Windows, nvidia or vesa (not me) driver. Even now
with Ubuntu 10.04 and nvidia driver the screen is perfect.

I attached a new photo. It shows horizontal lines when nothing changes in the
screen contents and the hard disk is idle.

I am an embedded software programmer. I think this might have something to do
with graphic adapter bus timings. Once I had an AD converter board which had
periodical errors in DMA transfers when wait states were not set correctly.
This graphic adapter shares memory with mother board and I guess it picks other
memory bus traffic. This might not be shown if graphic adapter has an internal
memory. Do you yourself have a geforce 4?

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--- Comment #30 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #29)
> Do you yourself have a geforce 4?
I have a NV18 (GeForce4 MX 400) PCI card which shows no such issues at
1920x1200 over VGA with nouveau. Your description of the problem reads like an
analog issue, which is why I went for the "do your cables suck" option
:) But
if the same hw doesn't show the issue with other software, clearly nouveau
is
at fault.

However... who knows why. Certainly bus timings are an option. Perhaps the IGP
is configured a little differently than the other stuff. Unfortunately the
current code to handle all that for pre-nv50 is basically a sequence of
semi-random writes to semi-random places. Take a look at
drivers/gpu/drm/nouveau/dispnv04/ to see what I mean.

Chances are that in order to get any movement on this issue, you will need to
make a mmiotrace of the nvidia driver setting the resolution. See
https://wiki.ubuntu.com/X/MMIOTracing for how to do that. With trace in hand,
one could then try to match it up with what dispnv04 does. Good times...

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--- Comment #31 from Vesa <piip at mail.com> ---
Created attachment 93765
  --> https://bugs.freedesktop.org/attachment.cgi?id=93765&action=edit
Mmiotrace

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--- Comment #32 from Vesa <piip at mail.com> ---
I tried to get mmiotrace log file. I had to manually stop generating it after
it was 400 megs long. It seems to be almost full of consecutive memory writes.
I copied some lines from it to an attachment. Hopefully these lines are useful.

Maybe nvidia people are now willing to help...

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NV1F] Flickering screen on |[NV1F] Flickering screen on
                   |Geforece 4                  |Geforce 4

--- Comment #33 from Ilia Mirkin <imirkin at alum.mit.edu> ---
On the off chance that this hardware still lives, can you try the patch in
https://bugs.freedesktop.org/attachment.cgi?id=119726

That should divide the clock on NV1F by 1000. There are other differences from
xf86-video-nv in the arb calculation logic, but let's start small :)

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--- Comment #34 from Patrick McMunn <doctorwhoguy at gmail.com> ---
I wonder if this bug may either be related to, or may actually be the same as,
bug 61537. I also have this same issue with a PC using an nVidia GeForce 4 MX
IGP, and I know that the monitor attached to it has a bad EDID. I suspect Vesa
may also have a monitor with a bad EDID; that would explain why his
monitor's
resolution was not correctly detected by Xorg (see comment #12).

I applied the above patch to Linux 4.4.11 sources, recompiled my kernel, and
rebooted. The problem is not completely fixed, but it is noticeably improved.
Whereas before the whole screen would intermittently jump, now there are simply
random flashes of horizontal lines on random places on the screen. I generally
run this box as a light-duty server, so I mainly ssh into it from my desktop,
and I didn't boot into a GUI for testing. I just booted it and observed the
text console.

I wouldn't consider this patch a fix, but it is perhaps a mitigation. In any
case, since I suspect that this may actually be the same as bug 61537, it would
probably be wise to discuss with other devs, per Martin Peres' comment,
before
submitting any changes to the tree.

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--- Comment #35 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Patrick McMunn from comment #34)
> I wonder if this bug may either be related to, or may actually be the same
> as, bug 61537. I also have this same issue with a PC using an nVidia
GeForce
> 4 MX IGP, and I know that the monitor attached to it has a bad EDID. I
> suspect Vesa may also have a monitor with a bad EDID; that would explain
why
> his monitor's resolution was not correctly detected by Xorg (see
comment
> #12).
> 
> I applied the above patch to Linux 4.4.11 sources, recompiled my kernel,
and
> rebooted. The problem is not completely fixed, but it is noticeably
> improved. Whereas before the whole screen would intermittently jump, now
> there are simply random flashes of horizontal lines on random places on the
> screen. I generally run this box as a light-duty server, so I mainly ssh
> into it from my desktop, and I didn't boot into a GUI for testing. I
just
> booted it and observed the text console.
> 
> I wouldn't consider this patch a fix, but it is perhaps a mitigation.
In any
> case, since I suspect that this may actually be the same as bug 61537, it
> would probably be wise to discuss with other devs, per Martin Peres'
> comment, before submitting any changes to the tree.
Thanks for testing. The other bug you reference is on very different hardware
(G80+) which has an *entirely* different display unit. The patch I wrote was
based on a few observations of the old xf86-video-nv code compared to nouveau.
There were other differences, but those seemed like the biggest ones.

Sounds like some of the other ones still matter though if you're still
seeing
flickering.

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #36 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

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