I’m using Fedora 37 KDE on a Thinkpad P14s (no dedicated GPU) with two identical external monitors.
Until kernel 6.2.9, this setup worked fine. With kernel 6.2.11 and above (tested with .12, .13, .14), the second external monitor won’t turn on, even though it is recognized by and enabled within the system.
Here is the output of inxi -MGxxS --edid
— except for kernel version and temperatures, it looks identical with all the kernels I’ve tried:
System:
Host: skellige Kernel: 6.2.14-200.fc37.x86_64 arch: x86_64 bits: 64
compiler: gcc v: 2.38-26.fc37
parameters: BOOT_IMAGE=(hd0,gpt2)/vmlinuz-6.2.14-200.fc37.x86_64
root=UUID=ee9b82d9-29ea-4d47-9eed-db5f383fdb70 ro rootflags=subvol=root
rd.luks.uuid=luks-b58a10ef-dfa4-48fe-8fc0-125a491bec96 rhgb quiet
Desktop: KDE Plasma v: 5.27.4 tk: Qt v: 5.15.9 wm: kwin_x11 vt: 2 dm: SDDM
Distro: Fedora release 37 (Thirty Seven)
Machine:
Type: Laptop System: LENOVO product: 21A0004WMX v: ThinkPad P14s Gen 2a
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: LENOVO model: 21A0004WMX v: SDK0J40697 WIN
serial: <superuser required> UEFI: LENOVO v: R1MET53W (1.23 )
date: 02/23/2023
Graphics:
Device-1: AMD Cezanne [Radeon Vega Series / Radeon Mobile Series]
vendor: Lenovo driver: amdgpu v: kernel arch: GCN-5 code: Vega
process: GF 14nm built: 2017-20 pcie: gen: 3 speed: 8 GT/s lanes: 16
link-max: gen: 4 speed: 16 GT/s ports: active: DP-5,DP-6,eDP-1 empty: DP-1,
DP-2, DP-3, DP-4, DP-7, HDMI-A-1 bus-ID: 07:00.0 chip-ID: 1002:1638
class-ID: 0300 temp: 39.0 C
Device-2: Chicony Integrated Camera type: USB driver: uvcvideo
bus-ID: 1-2:2 chip-ID: 04f2:b6d0 class-ID: fe01 serial: 0001
Device-3: Generalplus GENERAL WEBCAM type: USB
driver: snd-usb-audio,uvcvideo bus-ID: 3-1.4.4.2:10 chip-ID: 1b3f:2247
class-ID: 0102 serial: JH0319_20210727_v017
Display: x11 server: X.Org v: 1.20.14 with: Xwayland v: 22.1.9
compositor: kwin_x11 driver: X: loaded: amdgpu
unloaded: fbdev,modesetting,vesa dri: radeonsi gpu: amdgpu display-ID: :0
screens: 1
Screen-1: 0 s-res: 7039x1440 s-dpi: 96 s-size: 1862x381mm (73.31x15.00")
s-diag: 1901mm (74.83")
Monitor-1: DP-5 mapped: DisplayPort-4 pos: primary,top-center
model: Philips PHL 275B1 serial: UK02237028974 built: 2022 res: 2560x1440
hz: 60 dpi: 109 gamma: 1.2 chroma: red: x: 0.667 y: 0.314 green: x: 0.290
y: 0.655 blue: x: 0.153 y: 0.047 white: x: 0.314 y: 0.329
size: 597x336mm (23.5x13.23") diag: 685mm (27") ratio: 16:9
modes: 2560x1440, 1920x1080, 1680x1050, 1280x1024, 1440x900, 1280x960,
1280x720, 1024x768, 832x624, 800x600, 720x576, 720x480, 640x480, 720x400
Monitor-2: DP-6 mapped: DisplayPort-5 pos: top-right
model: Philips PHL 275B1 serial: UK02237028975 built: 2022 res: 2560x1440
dpi: 109 gamma: 1.2 chroma: red: x: 0.667 y: 0.314 green: x: 0.290
y: 0.655 blue: x: 0.153 y: 0.047 white: x: 0.314 y: 0.329
size: 597x336mm (23.5x13.23") diag: 685mm (27") ratio: 16:9
modes: 2560x1440, 1920x1080, 1680x1050, 1280x1024, 1440x900, 1280x960,
1280x720, 1024x768, 832x624, 800x600, 720x576, 720x480, 640x480, 720x400
Monitor-3: eDP-1 mapped: eDP pos: bottom-l model: AU Optronics 0x573d
built: 2021 res: 1920x1080 hz: 60 dpi: 158 gamma: 1.2 chroma: red: x: 0.647
y: 0.329 green: x: 0.302 y: 0.604 blue: x: 0.153 y: 0.055 white: x: 0.314
y: 0.329 size: 309x174mm (12.17x6.85") diag: 355mm (14") ratio: 16:9
modes: 1920x1080, 1680x1050, 1280x1024, 1440x900, 1280x800, 1280x720,
1024x768, 800x600, 640x480
API: OpenGL v: 4.6 Mesa 23.0.3 renderer: AMD Radeon Graphics (renoir LLVM
15.0.7 DRM 3.49 6.2.14-200.fc37.x86_64) direct-render: Yes
It is “Monitor-2” in this output that won’t turn on with kernels 6.2.11 or higher, but works fine with 6.2.9.
Any pointers as to how I can start debugging this problem? Or does this point to a kernel issue that I can’t fix myself?