Differences

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--- doc:appunti:hardware:rtl8852be_on_debian_12 [2024/10/04 12:15] – [Providing the firmware] niccolo
+++ doc:appunti:hardware:rtl8852be_on_debian_12 [2025/05/26 09:34] (current) – [DKMS self compiled module does not work!] niccolo
@@ Line 1: / Line 1: @@
 ====== RTL8852BE WiFi adapter on Debian 12 Bookworm ======
+===== DKMS self compiled module does not work! =====
+:!: **WARNING**! The recipe explained in this page actually does not work! At the end you will have a kernel module and a firmware blob that enable the WiFi adapter, they even support the WiFi scanning function, showing the available ESSIDs, but if you try to associate with an access point, the action fails with the following messages in loop:
+<code>
+wlan0: authenticate with b2:32:6e:53:27:2a
+wlan0: 80 MHz not supported, disabling VHT
+</code>
+What actually does work is installing **kernel 6.12** from Bookworm backports, along with the **firmware-realtek** package:
+  * **[[https://packages.debian.org/bookworm-backports/linux-image-6.12.22+bpo-amd64|linux-image-6.12.22+bpo-amd64_6.12.22-1~bpo12+1_amd64.deb]]**
+  * **[[https://packages.debian.org/bookworm-backports/firmware-realtek|firmware-realtek_20241210-1~bpo12+1_all.deb]]**
+===== Compiling the module with DKMS =====
+:!: **WARNING**! The kernel module obtained with this procedure actually does not work!
 The Realtek WiFi Network Controller **RTL8852BE** is not supported by the **6.1.0 Linux kernel** shipped with **Debian 12 Bookworm**. In this page you can find the steps required to compile and install the required kernel module and firmware.
@@ Line 8: / Line 26: @@
   * Download and install the **rtw8852b_fw-1.bin** firmware.
+{{ .:mini_pc_t9plus:ami-bios-secure-boot.jpg?200|Secure Boot in BIOS}}
 A **self compiled kernel module** is strictly tied to the running kernel, so **it must be re-compiled** whenever the kernel package is upgraded. The official Debian kernel is properly signed, so it runs even if the **Secure Boot** option is enabled into the BIOS. But the self compiled kernel module is a non-trusted software running at kernel level, so it requires that the Secure Boot into the BIOS to be disabled.
@@ Line 20: / Line 39: @@
 <code>
+apt install debootstrap
 mkdir -p /usr/local/src/chroot/dkms
 debootstrap bookworm /usr/local/src/chroot/dkms http://deb.debian.org/debian/
@@ Line 111: / Line 131: @@
 </code>
-You can download the required firmware from the **[[https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/rtw89/rtw8852b_fw-1.bin|kernel Git repository]]** and save it into ... FIXME.
+You can download the required firmware from the **[[https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/rtw89/rtw8852b_fw-1.bin|kernel Git repository]]** and save it into **/usr/lib/firmware/rtw89/**; there are no directories for locally installed firmwares.
+===== Signal level not reported =====
+If everything is working, you can check for available WiFi networks using **iwlist**:
+<code>
+rfkill unblock wlan
+ifconfig wlan0 up
+iwlist wlan0 scan
+</code>
+The current module (rtw89 1.0.2) does not support the signal level reporting, for every ESSID you see the following:
+<code>
+Quality=70/70  Signal level=0 dBm
+</code>