외부 디스플레이 및 내부 디스플레이에 대한 백라이트 제어가 ThinkPad E14 Gen 3(AMD Ryzen 5500U)에서 작동하지 않습니다.

새 ThinkPad 장치에 커널 버전 5.10.0-7-amd64의 Debian Sid를 설치했습니다. Lenovo USB-C 도크 또는 내부 HDMI 소켓을 통해 외부 모니터를 연결하면 GNOME 또는 xrandr... 또한 내부 모니터의 밝기를 변경해도 작동하지 않습니다(키보드 단축키, GNOME 설정 및 수동 설정으로 테스트) /sys/class/backlight/acpi_video0/brightness).

USB 스틱을 통해 라이브 시스템을 부팅하면 모든 것이 잘 작동합니다.

여기에서 몇 가지 기본 시스템 정보를 확인할 수 있습니다.

ThinkPad E14 3세대(AMD Ryzen 5500U)

lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 7
01:00.0 Non-Volatile memory controller: SK hynix Device 174a
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8852
04:00.0 Non-Volatile memory controller: Intel Corporation SSD 660P Series (rev 03)
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Lucienne (rev c2)
05:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
05:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
05:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
05:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
05:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
05:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller

이와 같은 문제를 디버깅하는 방법과 이 목적을 위해 올바른 정보를 수집하는 방법을 잘 모르겠습니다. 이 문제를 해결하는 데 도움을 주시면 매우 기쁠 것입니다.