Nouveau - Mar 2016 - [Bug 94643] New: 4K Display on Displayport goes black when pointer hits column 0

https://bugs.freedesktop.org/show_bug.cgi?id=94643

            Bug ID: 94643
           Summary: 4K Display on Displayport goes black when pointer hits
                    column 0
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: rmu at unfoo.net
        QA Contact: xorg-team at lists.x.org

I have a very strange problem with a recently purchased ViewSonic 4k display
connected via display port to a Thinkpad 410 with nvidia gt218m (nvs 3100m).

Every time the mouse pointer touches the left edge of the screen, the display
becomes a block of solid color and freezes. Suspend/resume of the laptop
reanimates the display.

versions: X server 1.17.2, linux kernel 4.5.0, nouveau 1.0.11 and 1.0.12, dual
screens active (also happens with external monitor active only, though that
configuration is very unstable), does not matter if the external monitor is
configured as "left", "right" or "top" to the
internal; did not try "bottom".
System: ubuntu 14.04, linux kernel from mainline ppa, x-server & co is of
lts-wily variant.

with workaround: xbarrier 1 0 1 2160, so pointer can't go to column 0,
everything seems stable.

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--- Comment #1 from Robert Sch�ftner <rmu at unfoo.net> ---
Created attachment 122461
  --> https://bugs.freedesktop.org/attachment.cgi?id=122461&action=edit
Xorg.0.log

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--- Comment #2 from Robert Sch�ftner <rmu at unfoo.net> ---
Clarifications: only the external monitor goes "solid color", LVDS-1
remains
working. Does not happen with 2560�1440 screen connected via DisplayPort.

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--- Comment #3 from Robert Sch�ftner <rmu at unfoo.net> ---
I just managed to hit this bug again, this time external display went gray,
keyboard was dead, internal display was not "damaged" but did not
update any
more except for mouse pointer, that could be moved.

syslog:

Apr  4 14:06:24 boltzmann kernel: [346097.973285] nouveau 0000:01:00.0:
Xorg[2270]: failed to idle channel 3 [Xorg[2270]]
Apr  4 14:06:24 boltzmann kernel: [346097.973475] nouveau 0000:01:00.0: fb:
trapped read at 002001e020 on channel 3 [0fb30000 Xorg[2270]] engine 0c
[SEMAPHORE_BG] client 08 [PFIFO_READ] subclient 00 [] reason 00000002
[PAGE_NOT_PRESENT]
Apr  4 14:06:24 boltzmann kernel: [346097.973505] nouveau 0000:01:00.0: gr:
TRAP_DISPATCH (unknown 00000004)
Apr  4 14:06:24 boltzmann kernel: [346097.973519] nouveau 0000:01:00.0: fb:
trapped read at 0000000400 on channel 3 [0fb30000 Xorg[2270]] engine 00
[PGRAPH] client 03 [DISPATCH] subclient 00 [GRCTX] reason 0000000f
[DMAOBJ_LIMIT]
Apr  4 14:06:24 boltzmann kernel: [346097.973548] nouveau 0000:01:00.0: gr:
TRAP_DISPATCH (unknown 00000008)
Apr  4 14:06:24 boltzmann kernel: [346097.973591] nouveau 0000:01:00.0: fb:
trapped read at 0000015400 on channel 3 [0fb30000 Xorg[2270]] engine 00
[PGRAPH] client 03 [DISPATCH] subclient 00 [GRCTX] reason 0000000f
[DMAOBJ_LIMIT]
Apr  4 14:06:24 boltzmann kernel: [346097.973619] nouveau 0000:01:00.0: gr:
TRAP_DISPATCH (unknown 00000008)
Apr  4 14:06:24 boltzmann kernel: [346097.973625] nouveau 0000:01:00.0: gr:
00200030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 0230 data 000000cf
Apr  4 14:06:24 boltzmann kernel: [346097.973646] nouveau 0000:01:00.0: fb:
trapped read at 0000045600 on channel 3 [0fb30000 Xorg[2270]] engine 00
[PGRAPH] client 03 [DISPATCH] subclient 00 [GRCTX] reason 0000000f
[DMAOBJ_LIMIT]
Apr  4 14:06:24 boltzmann kernel: [346097.973666] nouveau 0000:01:00.0: gr:
00000030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 0234 data 00000000
Apr  4 14:06:24 boltzmann kernel: [346097.973684] nouveau 0000:01:00.0: gr:
00000030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 0238 data 00000040
Apr  4 14:06:24 boltzmann kernel: [346097.973708] nouveau 0000:01:00.0: gr:
00000030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 023c data 00000001
Apr  4 14:06:24 boltzmann kernel: [346097.973734] nouveau 0000:01:00.0: gr:
00000030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 0240 data 00000000
Apr  4 14:06:24 boltzmann kernel: [346097.973759] nouveau 0000:01:00.0: gr:
00000030 [ILLEGAL_MTHD ILLEGAL_CLASS] ch 3 [000fb30000 Xorg[2270]] subc 2 class
0000 mthd 0248 data 00000915

[repeats like that with different mthd/data]

I killed Xorg with -9 and could reboot cleanly (via ssh).

Any hints how to debug this?

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--- Comment #4 from Karol Herbst <freedesktop at karolherbst.de> ---
ohhh I think in the end it is just an invalid memory access caused by some
strange offset by 1 problem and then the gpu gets a bit upset.

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--- Comment #5 from Robert Sch�ftner <rmu at unfoo.net> ---
I already had a quick look for "obvious" off-by-one-errors in
linux/drivers/gpu/drm/nouveau, following nv50_crtc_cursor_move, the but of
course I didn't find any.

Usually the GPU does not go completely bonkers, the LVDS-connected display of
the laptop continues to display a screen and usually remains completely
useable.

I also tried enabling "SWcursor", but that leads to completely black
screen and
unuseable X, even with only internal display, which I probably should report as
a separate bug.

If somebody has an idea where to look, I'm quite capable of compiling and
testing patched nouveau kernel and userspace drivers.

Would something like mmiotrace be helpful or a waste of time?

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--- Comment #6 from Robert Sch�ftner <rmu at unfoo.net> ---
proprietary nvidia 340.96 driver on ubuntu xenial stock distro kernel works as
expected, no pointer-related strangeness. so the hardware should be capable.

nonetheless, this driver is not a viable option, as suspend to ram, switching
virtual terminals and other random stuff segfaults in libGL etc...

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

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

--- Comment #7 from Martin Peres <martin.peres at free.fr> ---
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