On 3/25/26 3:42 AM, Turritopsis Dohrnii Teo En Ming wrote:
I had bought refurbished/second hand/used Edxis Chromebook model LI9 with Intel Celeron N3450 processor, 4 GB RAM, 32 GB eMMC, Windows 11 Pro and Microsoft Office Professional Plus 2013 for SGD$85 at Siglap MRT station exit 2 TEL line on 24 Mar 2026 Tuesday at about 7.15 pm in the evening.The Edxis Chromebook has MrChromebox-2512.2 01/25/2026 UEFI firmware, which allows users to install operating systems other than ChromeOS, like Linux and Windows. At the top of the BIOS screen, it says "CTL Chromebook NL7/NL7T (Blacktip)".
Looking through the MrChromebox organization on Github, it seems that sound issues are a recurrent problem:
https://github.com/MrChromebox/firmware/issues/334>this isn't a system firmware issue, it's a complex mix of kernel/driver/alsa/dsp firmware. I'm not aware of any way to get audio working on SKL/KBL devices under Linux when using a recent kernel
This indicates that at least some permutations of device and software are not compatible with MrChromebox. The first thing I would do is figure out if MrChromebox is actually supported for your particular device.
https://docs.mrchromebox.tech/docs/supported-devices.html In particular, there is this notice:>Your device's board name is what determines if it's supported or not -- not the make, model, CPU, or anything else. The only thing that matters is the name, so use that when determining support in the table below (or for anything else really).
You can find the board name by looking at the HWID:>The board name is listed at the bottom of both the Recovery Mode and Developer Mode screens -- it's the first part of the hardware ID (HWID), before any spaces or hyphens.
You mention that the device you bought has a N3450 processor. That processor is part of the Apollolake family of Intel processors. There are some Edxis products listed as supported under the Apollolake family. However, given the disclaimer, that alone doesn't mean that the device you have is supported.
However, supposing it is supported, then there *might* be some helpful guidance found in the Linux Mint forums:
https://forums.linuxmint.com/viewtopic.php?p=2282933#chromebooks>If you have an Apollo Lake Chromebook (such as product name Babytiger / ASUS CX1500CN Chromebook), the instructions in the following Reddit post by MrChromebox has worked for a number of people HOWTO: Audio on Apollolake devices under Linux.
The reddit post: https://www.reddit.com/r/chrultrabook/comments/uc0b6i/howto_audio_on_apollolake_devices_under_linux/has details, presumably from the developer of MrChromebox, that might get sound working, assuming that your particular board is in fact otherwise supported by MrChromebox. There is a list of instructions in that Reddit thread.
There is also mention in that thread of more recent tricks for getting sound working with something called Chrultrabook. Apparently a chrultrabook is "a modified Chromebook designed to run Windows, Linux, or even macOS by utilizing MrChromebox coreboot firmware and custom CoolStar drivers."
Given that you mentioned CoolStar drivers in a later reply, this area might also be fruitful for searching for answers. There is a "fixing audio" section of its install guide:
https://docs.chrultrabook.com/docs/installing/installing-linux.html#fixing-audio Which mentions a script for fixing or setting up audio. Finally, from your more recent reply,>I have tried everything suggested by ChatGPT and Google AI but everything I have tried fails.
This is going to complicate things considerably. Running random commands that a stochastic parrot generated is a surefire way to mess up your system. I strongly recommend starting from scratch if possible by first re-installing Debian and then
1. Trying to follow the instructions about fixing audio in the aforementioned chrultrabook.com URL. If that works, great. If not, 2. Try following the instructions in the reddit thread (a cursory glance at the python script from chrultrabook *appears* to show that it automatically tries what these instructions do during the course of its execution, so... might not be all that helpful if the chrultrabook script fails).
Best of luck. -- In Solidarity, Preston Maness 512-955-1048 https://keyoxide.org/79895B2E0F87503F1DDE80B649765D7F0DDD9BD5
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