[BUG] RTL8852BE Wi-Fi negotiates only 54 Mbps on Ubuntu Studio 26.04 (Kernel 7.0.0-27)

[Stefan Bader]

On 02/07/2026 21:25, Novin George Thomas wrote:
> Hello Ubuntu Studio Team,
> 
> I am experiencing a severe network speed bottleneck on a newly installed 
> Ubuntu Studio 26.04 system.
> 
> On my Lenovo IdeaPad Gaming 3 15ARH7 laptop, the hardware is fully 
> capable of 200 Mbps (tested and verified natively on a Windows dual-boot 
> configuration). However, under Ubuntu Studio 26.04, the wireless 
> download speed is strictly throttled and caps out at roughly 20 Mbps.
> 
> Hardware and Driver Diagnostics:
> - Laptop: Lenovo IdeaPad Gaming 3 15ARH7
> - Network Controller: Realtek Semiconductor Co., Ltd. RTL8852BE PCIe 
> 802.11ax Wireless Network Controller [10ec:b852]
> - Active Driver Module: rtw89_8852be
> 
Please file a Launchpad bug report using "ubuntu-bug linux" which 
assists in gathering relevant logs and HW information. Thanks.

-Stefan

> Workarounds Maintained (None of these resolved the 20 Mbps cap):
> 1. Completely disabled NetworkManager wifi power savings (wifi.powersave 
> = 2).
> 2. Generated /etc/modprobe.d/rtw89.conf explicitly passing:
>     options rtw89_pci disable_aspm_l1=y disable_aspm_l1ss=y disable_clkreq=y
>     options rtw89_core disable_ps_mode=y
> 3. Updated the regulatory domain mapping out of fallback '00' to 
> 'country IN' via cfg80211 settings. (Verified active via `iw reg get`).
> 4. Disabled MAC address randomization and forced IPv4 precedence over 
> IPv6 routing.
> 
> Despite the driver power management and hardware clock requirements 
> being completely bypassed, the link speed refuses to scale up to normal 
> capacity. It appears to be an active bug or optimization regression 
> regarding the rtw89 kernel module handling this specific Realtek 
> hardware revision in the 26.04 cycle.
> 
> Please let me know what logs or terminal dumps you need me to supply to 
> help track this issue down.
> 
> Best regards,
> Novin George Thomas
> 

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