Package: src:linux
Followup-For: Bug #949369

Dear Maintainer,

Confirmation of this bug,
it seems to happen at random,
i don't know if it a kernel issue or a nouveau issue

from $grep -n3  chip /var/log/messages

15416-Apr 14 09:15:30  /usr/lib/gdm3/gdm-x-session[3388]: (--) modeset(0): HDMI 
max TMDS frequency 225000KHz
15417-Apr 14 09:15:38  kernel: [  481.351289] i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0
15418-Apr 14 09:15:46  kernel: [  489.351633] i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0
15419:Apr 14 09:15:46  kernel: [  489.352390] i915 0000:00:02.0: Resetting chip 
for hang on rcs0
15420-Apr 14 09:15:46  /usr/lib/gdm3/gdm-x-session[3388]: (II) modeset(0): EDID 
vendor "DEL", prod id 16505
15421-Apr 14 09:15:46  /usr/lib/gdm3/gdm-x-session[3388]: (II) modeset(0): 
Using hsync ranges from config file
15422-Apr 14 09:15:46  /usr/lib/gdm3/gdm-x-session[3388]: (II) modeset(0): 
Using vrefresh ranges from config file

# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster
# uname -v
#1 SMP Debian 5.4.19-1~bpo10+1 (2020-03-09)

$ lspci | grep ' VGA ' | cut -d" " -f 1 | xargs -i lspci -v -s {}
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Mobile) 
(rev 02) (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company UHD Graphics 630 (Mobile)
        Flags: bus master, fast devsel, latency 0, IRQ 154
        Memory at e4000000 (64-bit, non-prefetchable) [size=16M]
        Memory at a0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 5000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

01:00.0 VGA compatible controller: NVIDIA Corporation Device 1fb8 (rev a1) 
(prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device 860f
        Flags: bus master, fast devsel, latency 0, IRQ 207
        Memory at e5000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        Memory at 90000000 (64-bit, prefetchable) [size=32M]
        I/O ports at 4000 [size=128]
        Expansion ROM at e6080000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

$ optirun glxinfo|egrep "OpenGL vendor|OpenGL renderer"
[  921.728466] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) Unknown 
chipset: NV167

[  921.728481] [ERROR]Aborting because fallback start is disabled.

# lshw -C display
  *-display                 
       description: VGA compatible controller
       product: NVIDIA Corporation
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nouveau latency=0
       resources: irq:207 memory:e5000000-e5ffffff memory:80000000-8fffffff 
memory:90000000-91ffffff ioport:4000(size=128) memory:e6080000-e60fffff
  *-display
       description: VGA compatible controller
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:154 memory:e4000000-e4ffffff memory:a0000000-afffffff 
ioport:5000(size=64) memory:c0000-dffff

Might help some people:
https://gist.github.com/szpak/71081b40217fb27c7a565b8c7b972067

The same error happens with only the intel vga enabled in the bios,
so this is not bumblebee or alike related.

hth,
Wim

-- System Information:
Debian Release: 10.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.4.0-0.bpo.4-amd64 (SMP w/16 CPU cores)
Locale: LANG=nl_BE.UTF-8, LC_CTYPE=nl_BE.UTF-8 (charmap=UTF-8), 
LANGUAGE=nl_BE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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