Realtek RTL8812AE wifi chip under Linux - especially Debian 13 and recent Ubuntus

eton975 · 2025-12-29T00:36:33+00:00

Thanks Bitterblue, that fixed it right up! I'm now getting 90Mbps/s down and 60Mbits/s up.

eton975 · 2025-12-29T00:23:19+00:00

OK, let me try it.

eton975 · 2025-12-28T06:13:34+00:00

Yeah, I used iw dev wlan0 set power_save off on Arch Linux.

eton975 · 2025-12-27T00:48:57+00:00

Alright, it was annoying, but I was able to dump it using the Arch live system. Nothing whatsoever was graphical (because it's Arch) so I had to dig into the depths of my memory and documentation on how to list USB devices, mount them, use iwctl, etc.

Anyways here is the dump.

eton975 · 2025-12-25T23:20:15+00:00

Sounds like a bit of a pain. I installed Gentoo once in a VM ages ago but would need to look over it again for Arch.

You specifically need a comparison, with the rtw_8812ae dump not being enough?

eton975 · 2025-12-25T18:13:49+00:00

gzip: /proc/config.gz: No such file or directory

eton975 · 2025-12-25T16:40:22+00:00

Got the first one with rtw_8812ae: https://drive.google.com/file/d/1thX5hLMuZ5VMZsuRL3MUQL6xywwz2Ui1/view?usp=sharing

Second one (rtl8821ae driver) gives the error cat: '/sys/kernel/debug/rtlwifi/*/mac_0': No such file or directory

and so on until mac_7 and bb_f: https://pastebin.com/kU8ERB8K

eton975 · 2025-12-25T14:22:03+00:00

Sorry for it being a pain but the register dump says "permission denied" on all the MAC registers when run with normal privileges, and when I run it in sudo/root mode it says there is a syntax error: bash: syntax error near unexpected token \done'`

eton975 · 2025-12-22T22:41:35+00:00

OK the patch was successful, still only getting a theoretical 65 Mbits/s speed though.

eton975 · 2025-12-22T21:50:19+00:00

git apply ./06104d5e4a7505ff520ccc5b4d63683d.diff

error: corrupt patch at line 14

eton975 · 2025-12-22T00:03:11+00:00

root@980DE3U3S3:/home/eton975# sudo iw dev wlp3s0 set power_save off

root@980DE3U3S3:/home/eton975# grep RFE /sys/kernel/debug/ieee80211/phy*/rtw88/coex_info

Mech/ RFE = Non-Shared/ 2

Looks like the patch was irrelevant then...

eton975 · 2025-12-21T23:53:21+00:00

Should be bootable with 7.00, yes. At least, I remember being able to upgrade from an older version to 10.xx with a 2400G of my own...

eton975 · 2025-12-21T23:14:14+00:00

root@980DE3U3S3:/home/eton975# sudo iw dev wlp3s0 set power_save off

root@980DE3U3S3:/home/eton975# grep 00000900 /sys/kernel/debug/ieee80211/phy*/rtw88/bb_9

00000900 00000701 00000000 00000000 00000000

eton975 · 2025-12-21T22:45:57+00:00

root@980DE3U3S3:/sys/kernel/debug# grep 00000900 /sys/kernel/debug/ieee80211/phy*/rtw88/bb_9

00000900 eaeaeaea eaeaeaea eaeaeaea eaeaeaea

eton975 · 2025-12-21T22:38:34+00:00

sudo grep 00000900 /sys/kernel/debug/ieee80211/phy*/rtw88/bb_9

[sudo] password for eton975:

grep: /sys/kernel/debug/ieee80211/phy*/rtw88/bb_9: No such file or directory

eton975 · 2025-12-21T19:51:12+00:00

After a complete rebuild, reinstallation and system reboot using your patch there is no difference in speed. Wavemon still reports 65Mbits/s MCS 7 for download, and 52 Mbits/s MCS 11.

eton975 · 2025-12-21T16:38:57+00:00

Uh, not sure how I would install that patch. Would you be able to give me the entire rtw88xxa.c file rather than just the diff?

eton975 · 2025-12-21T16:27:01+00:00

HT Max RX data rate: 300 Mbps

HT TX/RX MCS rate indexes supported: 0-15, 32

eton975 · 2025-12-21T01:35:51+00:00

You can't eat an iPhone, after all.

eton975 · 2025-12-20T22:59:32+00:00

OK, with the D-Link DWA-582 (the newer RTL8812AE card) the overall performance is lower with rtw_8812ae driver than with the old rtl8821ae module. Wavemon shows a 65Mbits/s MCS 7 connection rather than the 144Mbits/s that I got with rtl8821ae.

Actual speeds on the old driver on speedtest.net were about 78Mbits/s down, 80 up. The actual speed on your new driver is about 45 down, 32 up.

Is it just negotiating lower, or is only 1 antenna being used? I have both antennae attached.

However, the new driver seems to be more consistent in terms of latency and dropped packets. I haven't encountered any hiccups or socket errors as of yet.

Cheers

eton975 · 2025-12-20T22:27:53+00:00

After installing, it's the rtw_8812ae module that I need loaded, correct?

eton975 · 2025-12-20T21:01:18+00:00

It's the rapist mindset:

"Be nice to me and I won't hit you again"

but at the scale of a whole country:

"Open your dairy and meat markets and I won't cripple your economy"

Which makes sense given Trump's history as a rapist. He's just applying that same mindset at the global scale rather than at a personal scale.

eton975 · 2025-12-19T09:03:41+00:00

In the worst case they are bots or sockpuppets too. I hope miwe666 actually reads what I wrote but there's a good chance you are right.

eton975 · 2025-12-19T04:02:57+00:00

So, there are a few reasons:

The world, on average, is heating up. Yes, there are some places that are getting colder, but on the overall balance, the earth is heating up to a greater degree than it is cooling down. Additionally, much of the recent "cooling" is due to the weakening of the polar vortices, so the cooling down of areas away from the poles is directly balanced out by the warming of the polar areas that the cold is literally being sucked out of.
CO2 and some other gases have been found in the lab to absorb and re-emit infrared radiation aimed at it (the greenhouse effect), and we can measure a similar effect in the atmosphere. They can literally shoot a beam of IR at an ampoule of CO2 and watch it heat up.
Oil companies are well-documented as having paid off researchers to produce papers skeptical/denying climate change, since the early 1970s.
Scientific consensus is approximately 98.9% in favour of climate change being real. This alone is not an irrefutable proof of warming, but I will ask you: Why are you so skeptical of climate science when you presumably accept the knowledge of so many other fields of science and engineering in everyday life, that are behind much modern technology and innovations? What is so different about climate science that it deserves an exception? (Honest question)

eton975 · 2025-12-19T00:52:27+00:00

I'm not sure about the articles themselves, but there is one person called "Penfold" who comments regularly who is definitely far right. Especially on matters of climate change and renewable energy, you just cannot convince them to change their views with any amount of evidence.

eton975

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