Nouveau - Jun 2015 - [Bug 90932] New: gm105 font glitches with kernel 4.1rc

https://bugs.freedesktop.org/show_bug.cgi?id=90932

            Bug ID: 90932
           Summary: gm105 font glitches with kernel 4.1rc
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: marcus.moeller at gmx.ch
        QA Contact: xorg-team at lists.x.org

Created attachment 116429
  --> https://bugs.freedesktop.org/attachment.cgi?id=116429&action=edit
font glitches with gm105

I have tried Kernel 4.1 with gm105 (NVidia K620 graphics card) and noticed some
font glitches. Some characters are not displayed at all. Sometimes those chars
appear while hovering them with the mouse, sometimes not. I have attached a
screenshot of Firefox. Please note that the word Firefox is sometimes displayed
as 'Fire  x'

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poma <pomidorabelisima at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #116429|text/plain                  |image/png
          mime type|                            |

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I'm not aware of a GM105. Do you perhaps mean GM107? Avoid using
xf86-video-nouveau with that, just use the modesetting ddx directly. nouveau
ddx has an incorrect integration with glamor (and no EXA support for maxwell).

I also believe that there were generic level issues in GLAMOR which were fixed
in Xorg 1.17 or so (at least, the font drawing got redone or something to that
effect).

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--- Comment #2 from Marcus Moeller <marcus.moeller at gmx.ch> ---
The strange thing is, that it works perfectly with nouveau on 4.0.

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Marcus Moeller <marcus.moeller at gmx.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|gm105 font glitches with    |gm107 font glitches with
                   |kernel 4.1rc                |kernel 4.1rc

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Marcus Moeller <marcus.moeller at gmx.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #116429|font glitches with gm105    |font glitches with gm107
        description|                            |

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--- Comment #3 from Marcus Moeller <marcus.moeller at gmx.ch> ---
It still appears in Kernel 4.1 final.

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--- Comment #4 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Created attachment 116671
  --> https://bugs.freedesktop.org/attachment.cgi?id=116671&action=edit
Screencast showing the behavior

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poma <pomidorabelisima at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #116671|text/plain                  |application/octet-stream
          mime type|                            |

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--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcus Moeller from comment #3)
> It still appears in Kernel 4.1 final.
Updating Xorg to 1.17 and switching to the modesetting X ddx (instead of the
nouveau X ddx) should fix this. The reason you're seeing this in 4.1 and not
4.0 is that 4.1 finally has acceleration enabled by default for GM107.

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--- Comment #6 from poma <pomidorabelisima at gmail.com> ---

/etc/X11/xorg.conf.d/00-modesetting.conf
Section "Device"
    Identifier "video0"
    Driver     "modesetting"
EndSection

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--- Comment #7 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Shouln't this be fixed in nouveau instead of moving to another driver? Or is
this just a suggestion for a workaround?

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcus Moeller from comment #7)
> Shouln't this be fixed in nouveau instead of moving to another driver?
Or is
> this just a suggestion for a workaround?
The fix in nouveau will be "remove glamor integration" and "fail
to load for
GM107+". But we haven't fully decided on that *quite* yet. And I have
an EXA
impl in the works for GM107, so perhaps we'll use that. TBD.

The problem that you're seeing is with glamor, and they changed the way font
rendering was done in X 1.17, which is why I'm suggesting you use that.

Separate from that, nouveau's integration with glamor is totally fubar'd
and
should be removed, as per the above, but that has nothing to do with any
misrendering you might see. For example perhaps you might observe the lack of a
GLX_ARB_create_context_profile. This is a symptom of DRI2 support basically
missing, which is going to cause major problems.

Since nouveau's integration with glamor would be no different from
modesetting's integration with glamor, might as well just use that
directly...
[There are one or two things nouveau can still do that modesetting can't,
but
those differences are in the process of being eliminated.]

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--- Comment #9 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Thanks for the explanation. For me the exa sounds like a great option. Besides
that we have tried the modesetting driver with the K620 card and noticed a much
higher CPU load on gnome-shell (even on inactivity).

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--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcus Moeller from comment #9)
> Thanks for the explanation. For me the exa sounds like a great option.
> Besides that we have tried the modesetting driver with the K620 card and
> noticed a much higher CPU load on gnome-shell (even on inactivity).
I wonder if it's using llvmpipe or something... should be ~same perf.

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--- Comment #11 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Yes that might be the case. Is there any way to check this?

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--- Comment #12 from poma <pomidorabelisima at gmail.com> ---
(In reply to Marcus Moeller from comment #11)
> Yes that might be the case. Is there any way to check this?
# journalctl -b | grep -i 'foo\|bar'

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--- Comment #13 from poma <pomidorabelisima at gmail.com> ---
Created attachment 116778
  --> https://bugs.freedesktop.org/attachment.cgi?id=116778&action=edit
modeset - glamor NV50

For comparison.

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--- Comment #14 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Created attachment 116784
  --> https://bugs.freedesktop.org/attachment.cgi?id=116784&action=edit
modesetting driver with latest Xorg updates

Latest test with vmlinuz-4.1.0-1, updated xorg-x11-server-Xorg to 1.17.2-1 and
modesetting driver makes it even worse (though there is no high CPU load
anymore)

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--- Comment #15 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcus Moeller from comment #14)
> Created attachment 116784 [details]
> modesetting driver with latest Xorg updates
> 
> Latest test with vmlinuz-4.1.0-1, updated xorg-x11-server-Xorg to 1.17.2-1
> and modesetting driver makes it even worse (though there is no high CPU
load
> anymore)
First it wasn't enough characters... now it's too many. Make up your
mind! :)

I need to re-run piglit against a GM107 to see if I've accidentally the
whole
thing. Martin has made one available for me remotely, but I haven't had time
to
actually do the run. But this look like a regular ol' bug in the 3d driver
somewhere.

Does this always happen? Windows of all sizes, or just huge ones? Anything else
you could tell me that'll help me debug this?

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--- Comment #16 from Marcus Moeller <marcus.moeller at gmx.ch> ---
This happened after scrolling through the page buffer in gnome terminal using
Shift+PgUP.

I have also re-checked 4.1 final without latest Xorg updates and modesetting
driver and can confirm that the font glitches are also there. llvmpipe is not
used in this case (only when nomodeset is active/vesa is used).

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--- Comment #17 from Marcus Moeller <marcus.moeller at gmx.ch> ---
Still present on 4.2. Are there any plans on how to proceed?

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--- Comment #18 from Ben Skeggs <skeggsb at gmail.com> ---
(In reply to Marcus Moeller from comment #17)
> Still present on 4.2. Are there any plans on how to proceed?
That's not surprising because it's not a kernel issue.  It's either
a 3D driver
bug, or a glamor bug.

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--- Comment #19 from Marcus Moeller <marcus.moeller at gmx.ch> ---
As nouveau is a kernel driver I suspected that it's somewhat related to the
kernel.

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--- Comment #20 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 118882
  --> https://bugs.freedesktop.org/attachment.cgi?id=118882&action=edit
serialize when vbo dirty

This (mesa) patch seems to help Ben when using GLAMOR on Kepler chips. Could
give it a shot to see if it improves the Maxwell situation as well. Doubtful
that it's the "right" thing though.

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--- Comment #21 from jamesstewartmiller at gmail.com ---
Hi, I don't know if this will help, but I have a gm107 (gtx 750 ti) and I
experience the font glitches on new installs of wily, which is 4.2.0-22

The issue disappears when I uncheck 'enable anti-alias' in fontsettings
(settings->appearance->fonts)

I have an xfce desktop (ubuntu studio).

Thanks for your time (and please, please, please get acceleration working on
nouveau on the gm107 - I can't run my games! and I'd rather use the
nouveau
driver so that I can use a realtime kernel for audio).

Many thanks, and if there is anything I can do to contribute/help then let me
know.

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--- Comment #22 from Roman Elshin <roman.elshin at gmail.com> ---
(In reply to Ilia Mirkin from comment #20)
> This (mesa) patch seems to help Ben when using GLAMOR on Kepler chips.
Could
> give it a shot to see if it improves the Maxwell situation as well.
Doubtful
> that it's the "right" thing though.
This patch helps with 750ti too (at least at first sight).

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--- Comment #23 from Marcus Moeller <marcus.moeller at gmx.ch> ---
I have upgraded to 4.3.4 and latest Xorg and cannot reproduce this behaviour
anymore. Everything seems fine now.

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

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

--- Comment #24 from Martin Peres <martin.peres at free.fr> ---
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