[Bug 100423] MMIO read of 00000000 FAULT at 022554 [ IBUS ]

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100423

--- Comment #29 from Pierre-Charles David <pcdavid-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
FWIW, I also get this one (022554), along with two others (10ac08 and 6013d4).

The machine is an ASUS UX501V with an Intel HD Graphics 530 + NVIDIA GTX 960M
(more details below). I'm running an up to date Debian 9.9 with a
4.19.28-2~bpo9+1 kernel (from stretch-backports). It is usually plugged to an
external screen though HDMI (32" AOC Q3277PQU at 2560×1440).

% cat /proc/version
Linux version 4.19.0-0.bpo.4-amd64 (debian-kernel-0aAXYlwwYIJuHlm7Suoebg@public.gmane.org) (gcc
version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)) #1 SMP Debian 4.19.28-2~bpo9+1
(2019-03-27)

% lspci
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev
07)
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor
Thermal Subsystem (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI
Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal
subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial
IO I2C Controller #0 (rev 31)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H Serial
IO I2C Controller #1 (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI
#1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller
[AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2
(rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3
(rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5
(rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
02:00.0 Unassigned class [ff00]: Alcor Micro Device 6621
03:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)

Details on the NVIDIA card:

01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
        Subsystem: ASUSTeK Computer Inc. GM107M [GeForce GTX 960M]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 127
        Region 0: Memory at dc000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at b0000000 (64-bit, prefetchable) [size=256M]
        Region 3: Memory at c0000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at e000 [size=128]
        Expansion ROM at dd000000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidia_current_drm, nvidia_current


% journalctl -b --no-hostname -o short-monotonic | grep nouveau
[   25.822549] kernel: nouveau: detected PR support, will not use DSM
[   25.822749] kernel: nouveau 0000:01:00.0: NVIDIA GM107 (1171b0a2)
[   25.889243] kernel: nouveau 0000:01:00.0: bios: version 82.07.94.00.1a
[   26.462330] kernel: nouveau 0000:01:00.0: fb: 2048 MiB GDDR5
[   26.462343] kernel: nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT
at 022554 [ IBUS ]
[   26.474851] kernel: nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT
at 10ac08 [ IBUS ]
[   27.774265] kernel: nouveau 0000:01:00.0: DRM: VRAM: 2048 MiB
[   27.774266] kernel: nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
[   27.774269] kernel: nouveau 0000:01:00.0: DRM: Pointer to TMDS table invalid
[   27.774271] kernel: nouveau 0000:01:00.0: DRM: DCB version 4.0
[   27.774883] kernel: nouveau 0000:01:00.0: DRM: MM: using COPY for buffer
copies
[   27.774892] kernel: [drm] Initialized nouveau 1.3.1 20120801 for
0000:01:00.0 on minor 1
                       NVRM: nouveau, rivafb, nvidiafb or rivatv 
                       NVRM: nouveau, rivafb, nvidiafb or rivatv 
[   76.402068] kernel: nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT
at 6013d4 [ IBUS ]
[   76.984544] /usr/lib/gdm3/gdm-x-session[1519]: (II) modeset(G0): [DRI2]  
DRI driver: nouveau
[   76.984544] /usr/lib/gdm3/gdm-x-session[1519]: (II) modeset(G0): [DRI2]  
VDPAU driver: nouveau
[   83.346751] kernel: nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT
at 6013d4 [ IBUS ]

The last line is repeated hundreds of times.

It may be related, but am not sure: right after a boot, the graphics (e.g.
GNOME Shell animations) are fast and smooth, but after a while (I think it's
related to the machine going to sleep, and/or the screen being locked), it
seems to go to a fallback non-accelerated mode. It's still usable, but even
moving a simple terminal window is slow. Strangely, even in this degraded mode,
scrolling full-screen pages is still smooth in Firefox, as is e.g. watching
videos.

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