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Flackernder Bildschirm mit nouveau auf Thinkpad p440 (Xorg)

Hallo,
Seit einiger Zeit sehe ich ab und an einen flackernder Bildschirm auf meinem Thinkpad und ich bin mir nicht sicher, wohin ich das am besten melden sollte (oder ob es vielleicht ein Indikator für "ersetz mich" ist – vielleicht könnt ihr mir ja einen Tipp geben ;) 

# Symptome
Mit einem mir noch nicht bekannten Muster, passiert es ab und an, dass mein externer Monitor ab und an ausgeht/resynct. Der Bildschrim wird einfach schwarz und meldet, dass das Signal verloren gegangen ist. 

# Technik
Ich habe hier ein Thinkpad 440p mit dieser Intel/Nvidia-Kombination auf einer klassischen Dockingstation. Das Display hängt über Displayport am Thinkpad; Das integrierte Display ist in der Regel aus. 

## lspci


$ lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:01.1 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x8 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 8 Series/C220 Series Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d4)
00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 (rev d4)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM87 Express LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 04)
02:00.0 VGA compatible controller: NVIDIA Corporation GK208M [GeForce GT 730M] (rev a1)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
04:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)


## lsusb


$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 001 Device 003: ID 138a:0017 Validity Sensors, Inc. VFS 5011 fingerprint sensor
Bus 001 Device 004: ID 17ef:1010 Lenovo ThinkPad Ultra Dock Hub
Bus 001 Device 005: ID 0bdb:193e Ericsson Business Mobile Networks BV N5321 gw
Bus 001 Device 006: ID 046a:0011 CHERRY G83 (RS 6000) Keyboard
Bus 001 Device 007: ID 5986:0268 Bison Electronics Inc. SunplusIT INC. Integrated Camera
Bus 001 Device 008: ID 17ef:100f Lenovo ThinkPad Ultra Dock Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 17ef:1010 Lenovo ThinkPad Ultra Dock Hub
Bus 002 Device 003: ID 0480:a202 Toshiba America Inc Canvio Basics HDD
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub



## Monitor
Als Monitor kommt ein Samsung Widescreen zum Einsatz


$ xrandr --query
Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 16384 x 16384
eDP-1 connected primary (normal left inverted right x axis y axis)
1920x1080 60.01 + 60.01 59.97 59.96 59.93 1680x1050 59.95 59.88 1400x1050 59.98 1600x900 59.99 59.94 59.95 59.82 1280x1024 60.02 1400x900 59.96 59.88 1280x960 60.00 1440x810 60.00 59.97 1368x768 59.88 59.85 1280x800 59.99 59.97 59.81 59.91 1280x720 60.00 59.99 59.86 59.74 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 1024x576 59.95 59.96 59.90 59.82 960x600 59.93 60.00 960x540 59.96 59.99 59.63 59.82 800x600 60.00 60.32 56.25 840x525 60.01 59.88 864x486 59.92 59.57 700x525 59.98 800x450 59.95 59.82 640x512 60.02 700x450 59.96 59.88 640x480 60.00 59.94 720x405 59.51 58.99 684x384 59.88 59.85 640x400 59.88 59.98 640x360 59.86 59.83 59.84 59.32 512x384 60.00 512x288 60.00 59.92 480x270 59.63 59.82 400x300 60.32 56.34 432x243 59.92 59.57 320x240 60.05 360x202 59.51 59.13 320x180 59.84 59.32 VGA-1 disconnected (normal left inverted right x axis y axis) 
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2-1 disconnected (normal left inverted right x axis y axis)
DP-2-2 connected 3440x1440+0+0 (normal left inverted right x axis y axis) 797mm x 333mm
3440x1440 59.97*+ 49.99 2560x1440 59.95 2560x1080 60.00 59.94 1920x1080 60.00 50.00 59.94 1680x1050 59.95 1600x900 60.00 1280x1024 75.02 60.02 1440x900 59.89 1280x800 59.81 1152x864 75.00 1280x720 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 DP-2-3 disconnected (normal left inverted right x axis y axis) 

## Kernel

6.6.15-2 (der aus Testing aktuell)
(sah das Problem aber ab und an schon in der 5er-Familie)

# Log

Während es passiert, kann ich in Ringbuffer sehen:


[  948.382317] nouveau 0000:02:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 [ PRIVRING ]
[  948.652736] nouveau 0000:02:00.0: firmware: failed to load nouveau/nv108_fuc084 (-2)
[  948.652779] nouveau 0000:02:00.0: firmware: failed to load nouveau/nv108_fuc084 (-2)
[  948.652786] nouveau 0000:02:00.0: Direct firmware load for nouveau/nv108_fuc084 failed with error -2
[  948.652815] nouveau 0000:02:00.0: firmware: failed to load nouveau/nv108_fuc084d (-2)
[  948.652835] nouveau 0000:02:00.0: firmware: failed to load nouveau/nv108_fuc084d (-2)
[  948.652837] nouveau 0000:02:00.0: Direct firmware load for nouveau/nv108_fuc084d failed with error -2
[  948.652839] nouveau 0000:02:00.0: msvld: unable to load firmware data
[  948.652845] nouveau 0000:02:00.0: msvld: init failed, -19
[  972.647010] perf: interrupt took too long (2579 > 2500), lowering kernel.perf_event_max_sample_rate to 77500
[  997.814019] nouveau 0000:02:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 [ PRIVRING ]
[ 1157.401213] perf: interrupt took too long (3256 > 3223), lowering kernel.perf_event_max_sample_rate to 61250
Im Journal nichts, was ich zuordnen kann. Relativ viel Gtk-Kram (aber hier kommt ein Xfce mit entsprechenden Rest zum Einsatz). 

Xorg, kein wayland.

Jemand eine Idee?

Gruß Frank

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