[Bug 75761] weston-launch no output - black screen

[Bug 75761] weston-launch no output - black screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|wayland-bugs-PD4FTy7X32lzq7FAFJ/aeQ@public.gmane.org |nouveau-PD4FTy7X32lNgt0PjOBp93rCq3LdnpKM@public.gmane.org
                   |top.org                     |rg
         QA Contact|                            |xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
                 CC|                            |wayland-bugs-PD4FTy7X32lzq7FAFJ/aeQ@public.gmane.org
                   |                            |top.org
            Product|Wayland                     |xorg
            Version|1.4.0                       |unspecified
          Component|weston                      |Driver/nouveau

--- Comment #10 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Trying to move this to Nouveau, BZ is being difficult...

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|NOTOURBUG                   |---

--- Comment #11 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Reopening as Nouveau bug...

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW

--- Comment #12 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Setting status to NEW, since this is a new Nouveau bug report, moved from
Weston.
Said to be a kernel regression after 3.10.

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #13 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
My bisection process so far is pretty frustrating, 
since the majority of the commits between 3.12 and 3.13 do not boot. 
I get corrupted output before being able to login. 

The screen looks like so:

http://i.imgur.com/C517qpP.jpg

My current progress:

# v3.12 good
# 0fef9d8a59abcd699761cb054b6c37a2bea9e31a  skip / won't boot
# 48ae0b355f21533145133002854de89a0537408d  skip / won't boot
# c17f5bb529221c7f4c0736e69ceb614da0df2838  bad
# 8df1d0c07f18bd84ea7d8c7bc2cff45ba2b09680  skip / won't boot
# 16c4f227ffc556a4851518092e2b5979da1280c1  skip / won't boot
# 5fa7543041cbc2d3139e8d2178df61a33ac3f9ac  skip / won't boot
# 6d8d163132d7df6ca701efcde7832046ecb2f040  skip / won't boot
# 98706ea99f2da8afdac69686de4ff982aca6a5c7  skip / won't boot
# v3.13 bad
# v3.14 bad

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #14 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I am only bisecting the nouveau directory, like so:

git bisect start v3.14 v3.10 -- drivers/gpu/drm/nouveau

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #15 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to comment #13)
> My bisection process so far is pretty frustrating, 
> since the majority of the commits between 3.12 and 3.13 do not boot. 
> I get corrupted output before being able to login. 

What HW are you using?

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[Bug 75761] weston-launch no output - black screen

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--- Comment #16 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Chipset: GF110 (NVC8)

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[Bug 75761] weston-launch no output - black screen

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--- Comment #17 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to comment #16)
> Chipset: GF110 (NVC8)

There are known issues with NVC8 that go away with blob pgraph fw, perhaps
worth trying with that. (See bug #54437.)

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[Bug 75761] weston-launch no output - black screen

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--- Comment #18 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I was able to boot all commits with following boot option:
nouveau.config=NvMSI=0

Thanks to xexaxo on the IRC for pointing out this option.


f074d733866628973eca0ddb0c534ef4561da9e0 is the first bad commit
commit f074d733866628973eca0ddb0c534ef4561da9e0
Author: Maarten Lankhorst <maarten.lankhorst-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
Date:   Wed Nov 20 15:14:31 2013 +1000

    drm/nouveau/kms: send timestamp data for correct head in flip completion
events

    Signed-off-by: Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

:040000 040000 99b978c435e8bb3e7bd91e30daf953940dcfe99c
dcff6c807e51e53d4de0064678c46bfd68e0a1ca M    drivers


Canonical broke Weston for me ;)

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #19 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Reverting the patch on current Linux master
(4a4389abdd9822fdf3cc2ac6ed87eb811fd43acc) fixes the issue for me.

Apperently s->crtc needs to be hardcoded to -1 for the screen not to stay black
when launching weston.

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

soundx94-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org changed:

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

--- Comment #20 from soundx94-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org ---
Thanks for bisecting the kernel. Reverting that patch on the latest kernel also
fixes the issue for me.
(Using NVE6: GTX 660)

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--- Comment #21 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to comment #20)
> Thanks for bisecting the kernel. Reverting that patch on the latest kernel
> also fixes the issue for me.
> (Using NVE6: GTX 660)

Hey, wait! Why did you close this bug?

Has upstream merged a fix, or did this problem never occur on upstream (hard to
imagine)?

It's not enough that you personally find a hack that fixes it for you alone, we
want it fixed for everybody.

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--- Comment #22 from soundx94-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org ---
I thought WORKSFORME is the proper status because it works for me at the moment
with this modification and it can get merged into upstream. Sorry if i
misunderstood the status label, do you want me to reopen it ?

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |---

--- Comment #23 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to comment #22)
> I thought WORKSFORME is the proper status because it works for me at the
> moment with this modification and it can get merged into upstream. Sorry if
> i misunderstood the status label, do you want me to reopen it ?

WORKSFORME means, that maintainers or developers cannot reproduce the bug at
all, and cannot find anything wrong.

I reopened this for you.

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--- Comment #24 from Lubosz Sarnecki <lubosz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Since Weston and Wayland 1.5.0 were released today, I wanted to ask about the
status of this bug.

Does the patch which causes the regression have enough legitimacy to stay and
break Weston?

Does someone understand the problem on a large scale?

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--- Comment #25 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to comment #24)
> Since Weston and Wayland 1.5.0 were released today, I wanted to ask about
> the status of this bug.
> 
> Does the patch which causes the regression have enough legitimacy to stay
> and break Weston?

It seems like a pretty correct fix, at first blush. And was necessary for
something else, IIRC.

> 
> Does someone understand the problem on a large scale?

It'll take someone with KMS API and Wayland experience to work out what's going
on. Probably would have to get a Wayland developer involved to figure this one
out.

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--- Comment #26 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
What did the -1 as crtc mean?

I'm not sure how this is weston-specific, though. Weston programs a pageflip on
a certain crtc, and then relies on that particular crtc to send back a pageflip
event as requested.

So if that's the culprit, is Nouveau on some particular hardware sending back
pageflip events on the wrong crtc? Or maybe mixing up crtcs so that no event
gets sent?

This would be easy to test by adding a weston_log("got pageflip event\n") to
src/compositor-drm.c:745, in function page_flip_handler(), and another in line
723 in vblank_handler(). The vblank_handler should be unused atm. I think.

If Weston never gets the pageflip event, its repaint loop would be stuck, which
would explain the symptoms. A side effect would be that clients would never get
frame callbacks, which means that e.g. weston-simple-shm would not be consuming
any CPU. Normally it should take at least few percent of one core. Otherwise
everything would seem to just work, since Weston does not hang but only not
repaint.

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--- Comment #27 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
I pulled out my old Dell desktop with a Pentium 4 processor, and AGB Nvidia
card (NV36), and it does the same thing. Mark45 on Phoronix said this issue
affected all 3 of his Nvidia cards when he tried to use my Wayland Live CD.

I added the "got pageflip event" lines as suggested, and it seems that they
appear multiple times in the log, and seem to keep going until I tty switch,
but the screen is still black. Using a vanilla Ubuntu kernel, and passing
nouveau.config=NvMSI=0 did not work for me, or for Mark45 on any of his Nvidia
cards.

Weston-desktop-shell starts fine, and I also tried weston-simple-shm, which did
not appear, but it did run.  

It can't be a mesa issue, as Weston is using pixman here in this case...

I wish I had tested this sooner, but I wasn't sure if my results on the older
desktop would reflect on newer Nvidia hardware.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #28 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I wonder if there are two different bugs in play here.

If you do get the vblank events right, like it sounds that Nerdopolis does
indeed get, then does reverting the blamed nouveau kernel patch make any
difference? I would be surprised if it does make a difference.

This other bug would be, that when Weston changes the video mode, it does not
call drmModeCrtcSetGamma. IIRC Michel Dänzer told me, that not calling that may
lead to black output, if the color translations tables are all zero due not
being explicitly set. So the main question here is, does Weston change the
video mode, or does it use the mode that is already set for fbcon?

Weston code base already has a call to drmModeCrtcSetGamma(), but it is used
only for color managed outputs I think. Yet, it is an example of how to call
it, so if someone having this problem could test that, it would be very useful.
If missing this call is indeed the problem, I think it should be a new Weston
bug report, as the Nouveau patch blamed here should not make a difference
AFAIU.

One more note: if you test reverting the blamed Nouveau patch, make sure your
*both* kernels with and without are built by you and launched the same way, to
make sure that the fbcon video mode is really the same on both. If the fbcon
video mode is different, then that could mask the drmModeCrtcSetGamma issue.

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[Bug 75761] weston-launch no output - black screen

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https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #29 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Hmm, a third remote possibility came to mind. If the timestamp delivered with
the DRM pageflip event does not advance, I suppose Weston's fade-in animation
might not advance either and therefore it never fades in. However this is hard
for me to believe, as I think it would have caused problems with Xorg, too...
wouldn't it?

Or maybe Xorg is only looking at the vblank counters, and you'd actually need a
program using GLX_OML_sync_control to even see the timestamps?

One could check the timestamps by:
weston_log("%s: time %u.%06u frame %u\n", __func__, sec, usec, frame);
in compositor-drm.c page_flip_handler() function.

Mm, I'd like to see a weston log with that when you have the black screen
problem.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #30 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
The only interesting thing that I can find in the dmesg logs is this:


[    1.509268] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.509269] [drm] No driver support for vblank timestamp query.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #31 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
Created attachment 100199
  --> https://bugs.freedesktop.org/attachment.cgi?id=100199&action=edit
weston log with pixman

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[Bug 75761] weston-launch no output - black screen

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--- Comment #32 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to comment #31)
> Created attachment 100199 [details]
> weston log with pixman

Something is seriously wrong here:
[09:58:29.402] queueing pageflip failed: Permission denied

But I see you have another weston session afterwards, which seems to run, but:
[12:26:36.371] page_flip_handler: time 0.000000 frame 603
[12:26:36.371] got pageflip event
[12:26:36.388] page_flip_handler: time 0.000000 frame 603
[12:26:36.388] got pageflip event
[12:26:36.404] page_flip_handler: time 0.000000 frame 603
[12:26:36.404] got pageflip event
[12:26:36.421] page_flip_handler: time 0.000000 frame 603
[12:26:36.421] got pageflip event
[12:26:36.437] page_flip_handler: time 0.000000 frame 603
[12:26:36.438] got pageflip event
[12:26:36.454] page_flip_handler: time 0.000000 frame 603

That means that the kernel DRM driver does not provide timestamps and it does
not even advance the vblank counter(?) if I understood right.

So at least for you, the problem is that the kernel DRM does not report proper
pageflip timestamps. I would consider this as a kernel driver bug, but if the
kernel developers insist, I suppose we could also hack around it in Weston by
providing fake timestamps, disabling the Presentation extension (somewhat
similar X11 Present, not yet merged) and yelling loudly. But I'd rather the
driver got fixed.

As far as I see, bad timestamps are enough to make Weston stay black (fade-in
animation not advancing), yet appear to work just fine. So at least we (Weston
devs) should detect when the kernel driver is faulty, and abort Weston.

Weston, and also the intention in Wayland, is to rely on the proper pageflip
timestamps from the kernel for timing... well, everything visual, so we really
would like it to work.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #33 from Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I filed bug #79502 for adding the detection to Weston.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #34 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
Just an FYI, I think the

[09:58:29.402] queueing pageflip failed: Permission denied

came from when I killed the previous Weston session, to have the
waylandloginmanager reload Weston after I recompiled it with the diag lines on
my live session. I was in another TTY

That was the only time I ever seen that happen so far

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[Bug 75761] weston-launch no output - black screen

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--- Comment #35 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
A few pageflip-related commits landed in the repo:

http://cgit.freedesktop.org/~darktama/nouveau/

http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=ff527544b0048d41a56097a66ff954fb9b0a2c75

Seems related to what was going on here. Give it a shot... (you'll need to
build it against the latest drm-next tree from
http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-next). Or try to apply
the patches to whatever kernel tree you're on -- should probably work.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #36 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
I'm trying to compile the module... it seems that it's gone from the log now???

How do I disable werror too?

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[Bug 75761] weston-launch no output - black screen

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--- Comment #37 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
I found out how to turn off werror, but I guess I need to know what patches I
need to apply... Is that the only commit that I need to try the fix?

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[Bug 75761] weston-launch no output - black screen

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--- Comment #38 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
All the patches are now in drm-next, just use that.

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[Bug 75761] weston-launch no output - black screen

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--- Comment #39 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
I would at least like to try to just try to apply them against the 3.13 nouveau
module, instead of trying to rebuild the whole kernel first? So is that the
only patch I would need?

I'm still on 3.13 (which is also affected), as I have been doing all of my
testing on the Weston side of things...

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[Bug 75761] weston-launch no output - black screen

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--- Comment #40 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to comment #39)
> I would at least like to try to just try to apply them against the 3.13
> nouveau module, instead of trying to rebuild the whole kernel first? So is
> that the only patch I would need?
> 
> I'm still on 3.13 (which is also affected), as I have been doing all of my
> testing on the Weston side of things...

Pretty sure that's the only patch. There were 2 other patches, but they only
matter for pre-nv50 hardware, which I assume you're not using (GeForce 7 and
earlier).

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--- Comment #41 from nerdopolis1-H+0wwilmMs3R7s880joybQ@public.gmane.org ---
I found the second patch too, and I applied that as well. It works now, even
after I applied them to 3.13, and built just the Nouveau module. 

I have an older Nvidia card, I think it's NV36.

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--- Comment #42 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
All those patches should have made it to 3.16 (and were cc'd to earlier stable
kernels). Does 3.16 work OK for people?

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[Bug 75761] weston-launch no output - black screen

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Martin Peres <martin.peres-Iz16wY1oaNPLSKGbIzaifA@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #43 from Martin Peres <martin.peres-Iz16wY1oaNPLSKGbIzaifA@public.gmane.org> ---
Works for me on the 3.16 and 3.17. Finally :)

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