Lenovo IdeaPad 720s (Ryzen)
The Lenovo IdeaPad 720s (Ryzen) is a laptop computer with a 13.3" screen, AMD Ryzen™ processor, webcam, microphone, audio in/out, 80211ac wireless card with bluetooth 4.1, 1 USB 3.0 Type-C (DP & Power Delivery), 1 x USB 3.0 Type-C (DP), 2 USB3 ports, and a fingerprint reader.
CPU/APU-wise, Linux support for the 720s is in decent shape since kernel ~4.15 (CPU and GPU temperatures per lm_sensors); the more recent the better. Its rtl8821ce WLAN and Bluetooth chip has no mainlined driver (as of 4.17), but rtl8821ce-dkms-gitAUR comes to rescue here.
Contents
PCI Devices
$ lspci 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15d0 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15db 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61) 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] Device 15e8 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e9 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ea 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15eb 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ec 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ed 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ee 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ef 01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter 02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a808 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Radeon Vega 8 Mobile (rev c4) 03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 15de 03:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 15df 03:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e0 03:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e1 03:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Device 15e2 03:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Device 15e3
USB Devices
$ lsusb Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 003 Device 005: ID 06cb:0081 Synaptics, Inc. Bus 003 Device 004: ID 0bda:c024 Realtek Semiconductor Corp. Bus 003 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub Bus 003 Device 002: ID 04f2:b5da Chicony Electronics Co., Ltd Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Hardware Support
UEFI
Before installing, disable Secure Boot in the BIOS. You can access the BIOS by pressing F2 at the Splash screen. The boot menu can also be accessed by pressing F12.
Video
X works natively with a current linux and xf86-video-amdgpu.
If you are having video issues with only the xf86-video-amdgpu installed, also install the AMD PRO package amdgpu-pro-libglAUR. See AMDGPU
Sound
Sound works with PulseAudio in linux 4.15-1 from testing repos.
Webcam
Chicony EasyCamera (USB)
Works out of the box on linux 4.19.12.
Ethernet
(No RJ45, use any working USB (A or C) dongle.)
Wireless
The rtl8821ce-dkms-gitAUR wireless driver is required in order for WiFi and Bluetooth to work.
Sometimes upon reboot, rfkill may block wireless communications. To unblock, run : rfkill unblock all
.
Active bluetooth may lock up the PC on lid close/suspend, then rfkill block bluetooth
.
Touchpad
Works out of the box with mutli-finger scrolling on linux 4.15-1 in X.
Hardware keys
No dedicated keys. The Fn functions on the F{1..12} keys are correctly recognised by X11 and work out of the box (Touchpad on/off etc.). Fn state can be inverted in the BIOS menu.
Finger Print Reader
Model: <Unknown>
<untested>
ACPI annoyances
ttys get filled with massive amounts of ACPI complaints, and are unusable as such. Mitigate by passing the pci=noaer
kernel commandline option.
CPU soft lockup
The mwait cpu instruction can cause a CPU soft lockup.
To fix the issue, add idle=nomwait
to kernel parameters.