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Showing posts older than #43004 · Back to latest

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Post #43001 71
Lumia 1520 Linux update: the audio hardware is finally talking!

Hey everyone,

It's been a minute since I posted an update on the Lumia 1520 mainline Linux project ....and this one ended up being a pretty big step forward.

Last time I posted, the phone was already at a pretty solid baseline... Linux was cold booting reliably, display/touch/buttons were working, USB networking + SSH were stable, suspend/resume was working, battery telemetry and backlight control were in place, etc.

Since then I've been digging into one of the bigger missing pieces: audio....a fucking nightmare lol

At first, I thought it might hit the same wall as WiFi. The Lumia's audio stack uses Qualcomm's ADSP co-processor, and I wasn't sure whether the Windows Phone TrustZone would even allow it to boot.

Turns out it does....

The ADSP now boots successfully, APR communication with it works, and I was able to bring up MSM8974's ADSP managed SLIMbus transport. That led to the actual codec on the phone. And at this point I've confirmed from the hardware itself that the Lumia 1520 uses a Qualcomm WCD9320 / Taiko codec.

Not just inferred from old Qualcomm sources either...Linux is physically enumerating it over SLIMbus and reading its own identification registers back as major ID "0x0102".

The codec actually exposes two separate SLIMbus functions:

PGD - control/register access

IFD - the audio port/channel interface

Both now enumerate independently and get their own logical addresses. From there I built out proper regmap access, power/reset handling, fresh bring-up, non-destructive late adoption, and the beginnings of the codec interrupt support.

The interesting part was the digital core. A large section of the codec's register map kept returning zero, which initially sent me down a rabbit hole looking for the external 9.6 MHz MCLK. I dumped the Lumia's ACPI tables, RPM clocks, all 36 PM8941 GPIOs and all 8 MPPs trying to find where Nokia routed it. That investigation was...."useful", but the clock wasn't actually the blocker.

The real issue was that Linux had never executed Qualcomm's original "wcd9xxx_bring_up()" sequence. Every audio milestone before this had been read only, so the missing initialization stayed hidden.

Once I implemented the downstream bring-up sequence and switched the codec onto its internal RC oscillator, the result was immediate:

87/87 previously inaccessible sentinel registers became readable.

71 matched Qualcomm's documented defaults exactly, and the remaining 16 fall into three consistent register families that appear to be revision-specific differences.

So the chain now looks like:

Linux → ADSP → QRTR/QMI → BAM → SLIMbus NGD → WCD9320 PGD/IFD → regmap → codec core release → internal RCO → digital core accessible

I also mapped the codec's interrupt parent to Lumia TLMM GPIO 72 and validated it electrically idle across direct sampling and suspend/resume testing. I haven't claimed full IRQ support yet because I haven't deliberately generated and cleared a real codec interrupt source.

And just to be clear: there is still no audible sound output yet. I'm not calling audio "working" until PCM data actually reaches an output.

What this does mean is that most of the unknown hardware/transport side of Lumia audio is now gone. What's left is the actual codec/ASoC implementation work: permanent automatic core initialization, nested IRQ handling, DAIs and SLIMbus port configuration, the MSM8974/Lumia machine driver, and then finally a fixed playback route to get the first test tone out of the phone.

I'm deliberately finishing the Lumia's hardware enablement before I start layering my RegenX OS work onto it. I'd rather have a known-good hardware platform first than end up debugging kernel/driver problems and OS layer problems at the same time.

Wi-Fi/BT is still the major documented blocker, charging still needs more work, and modem/camera remain further out.... but audio has gone from "this may require an entirely missing upstream stack" to actual driver development on hardware that is responding exactly where it
Post #42999 82
LACT Brings More NVIDIA OC Controls and GPU Sensors to Linux
http://www.techpowerup.com/351566/lact-brings-more-nvidia-oc-controls-and-gpu-sensors-to-linux

https://redd.it/1vn6myi
@r_linux
TechPowerUp LACT Brings More NVIDIA OC Controls and GPU Sensors to Linux Linux GPU overclocking and monitoring tool, LACT, has officially launched v0.10.0, adding a host of new overclocking and sensor options for NVIDIA GPUs. The update notes mention PowerMizer mode, which allows users to force the NVIDIA GPUs into the highest…
Post #42998 96
Want to try Stacking WM, but gnome and kde are too fancy

Hey all I've been using Linux for about a year and a half now and have really been loving it (I'm on void btw).

I have always used Tiling WMs since the beginning, I used Hyprland for a bit, ended up hating it for both the Dev's shadiness but also the absolute incredulous amount of churn. So I switched to Sway, from the very beginning I've only ever used Wayland.

I'm not at a place where I'm content but I am curious about swapping to a stacking WM. I was going to go KDE but, and I'm probably in the minority, I don't really like Kwin, and I actually find KDE to look kinda ugly.

I've been drawn to XFCE which I have installed but not tested yet. It's aesthetic is much more my vibe and classic with all the theming available.

Does Wayland have any compositors in this ball park of stable and consistent but not the usual?

https://redd.it/1vn2oa7
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Reddit From the linux community on Reddit Explore this post and more from the linux community
Post #42996 89
CVE-2026-53360: KVM SEV-SNP guest-to-host heap OOB and analysis of the upstream fix
https://blog.himanshuanand.com/2026/08/i-found-a-kvm-guest-to-host-heap-corruption-bug-and-someone-else-got-there-first/

https://redd.it/1vmcn4a
@r_linux
Himanshu Anand :: Security & Other Notes I found a KVM guest-to-host heap corruption bug and someone else got there first TLDR I independently found a heap out-of-bounds read/write in KVM’s SEV-SNP Page State Change handler. A malicious guest VM can corrupt host kernel heap memory and leak its layout, across the VM boundary, as many times as it wants. I reported it to security@kernel.org…
Post #42993 82
Updated GPG key for signing Firefox and Thunderbird Releases – Mozilla Security Blog
https://blog.mozilla.org/security/2026/08/10/updated-gpg-key-for-signing-firefox-and-thunderbird-releases/

https://redd.it/1vm87gm
@r_linux
Mozilla Security Blog Updated GPG key for signing Firefox and Thunderbird Releases Today, we moved to a new GPG signing subkey used to sign certain Firefox and Thunderbird artifacts (namely Linux tarballs, RPM packages, checksums files) after an unencrypted copy of the ...
Post #42987 75
OpenSSH 10.5 released, AI Welcome

>Recently the OpenSSH team have received a large number of security bug reports, many of which are findings from AI models or made with AI assistance. While many AI reports are determined not to have security impact when considered in the context of a realistic threat model, we very much welcome these reports, especially when combined with human triage, analysis, test-cases and particularly when accompanied by proposed fixes.

>We have seen a number of cases where a security bug identified by AI tools is subsequently independently discovered by a different researcher. This suggests that adversaries who do not report bugs to OSS projects are likely to be able to discover these bugs too. Given this, the OpenSSH team will, for now, be making more frequent releases to get bugfixes into users' hands more quickly rather than batching them until the next planned release.

Like most open source projects, AI-based fixes are coming in fast:

https://www.openssh.org/releasenotes.html#10.5

https://redd.it/1vlnzz2
@r_linux
www.openssh.org OpenSSH: Release Notes OpenSSH release notes
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