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Bug#1106744: marked as done (consider enabling additional GNSS kernel modules (CONFIG_GNSS_MTK_SERIAL))

Your message dated Thu, 05 Jun 2025 07:11:37 +0000
with message-id <E1uN4lF-007djr-1r@fasolo.debian.org>
and subject line Bug#1106744: fixed in linux 6.15.1-1~exp1
has caused the Debian Bug report #1106744,
regarding consider enabling additional GNSS kernel modules (CONFIG_GNSS_MTK_SERIAL)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1106744: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106744
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: linux
Severity: minor

Hi,
I've been taking an interest in GPS/GNSS lately and improving the user experience in particular, so I'm glad to see that the kernel's GNSS subsystem is enabled. However, it looks like a couple modules adding support for additional hardware is not yet enabled and in the absence of a reason otherwise I'd like to see them built as well:
$ unxz < /usr/src/linux-config-6.14/config.arm64_none_arm64.xz | grep -F GNSS
CONFIG_GNSS=m
CONFIG_GNSS_SERIAL=m
# CONFIG_GNSS_MTK_SERIAL is not set
CONFIG_GNSS_SIRF_SERIAL=m
CONFIG_GNSS_UBX_SERIAL=m
# CONFIG_GNSS_USB is not set

This configuration is nothing new; the Trixie/amd64 kernel is the same and it's probably been this way for a while.

Here "MTK_SERIAL" refers to MediaTek's GNSS modules which are pretty popular with DIY-ers and are used, for example, in Adafruit's Ultimate GPS modules. Enabling that module and presumably CONFIG_GNSS_USB as well will help with device enumeration which is currently a hot mess. Because these are serial devices probing for hardware isn't very practical, and in particular there is no USB device class for these types of devices, so they only clearly identify themselves as serial converters.
Nevertheless, this subsystem allows for device identification and management to be better handled by udev, Devicetree, and the like. This will certainly help embedded systems and automotive electronics right away; my interest was ignited by wanting a navigation system for cycling. Dealing with baud rate changes and such tweaks is very tricky at the moment; MediaTek's modules support increasing the baud rate of the GNSS receiver, and when 'stty' or termios(3) is used to adjust the speed of your host's serial interface in lockstep, this works great for getting more frequent data. However terminal device attributes can change underneath you after the last file descriptor to the device is closed, but on the MediaTek receiver's side of the link it'll still be happily using the custom speed for transmission. This creates a nasty surprise when the device is opened again; opening the device is often done only when necessary to save power and give the GNSS receiver a break.

Admittedly I haven't gotten to try out the GNSS subsystem yet or make these changes, but Debian is very well-suited for those navigation devices that could benefit the most, so enabling these modules to be built on all architectures would be nice.

Thanks

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--- Begin Message --- 
Source: linux
Source-Version: 6.15.1-1~exp1
Done: Salvatore Bonaccorso <carnil@debian.org>

We believe that the bug you reported is fixed in the latest version of
linux, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1106744@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Salvatore Bonaccorso <carnil@debian.org> (supplier of updated linux package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 05 Jun 2025 08:44:35 +0200
Source: linux
Architecture: source
Version: 6.15.1-1~exp1
Distribution: experimental
Urgency: medium
Maintainer: Debian Kernel Team <debian-kernel@lists.debian.org>
Changed-By: Salvatore Bonaccorso <carnil@debian.org>
Closes: 1056428 1106658 1106742 1106744 1107266
Changes:
 linux (6.15.1-1~exp1) experimental; urgency=medium
 .
   * New upstream stable update:
     https://www.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.15.1
 .
   [ Salvatore Bonaccorso ]
   * drivers/usb/host: Enable USB_XEN_HCD as module (Closes: #1106742)
   * [amd64] Add drivers/pinctrl/intel to kernel-image udeb (Closes: #1106658)
   * drivers/net/wireless/intel/iwlwifi: Enable IWLMLD as module
     (Closes: #1107266)
   * [ppc64*] Enable LPARCFG (LPAR Configuration Data) (Closes: #1056428)
 .
   [ Uwe Kleine-König ]
   * [arm64] Enable MFD_QNAP_MCU and drivers relying on that for
     rk3568-qnap-ts433 as a module
   * drivers/gnss: Enable GNSS_MTK_SERIAL and GNSS_USB as modules
     (Closes: 1106744)
 .
   [ Max Staudt ]
   * drivers/net/can: Enable can327 as a module
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 7cde99446f39072f164efe572ce529e8b87900c3 1528012 linux_6.15.1-1~exp1.debian.tar.xz
 4a91fcbf8d09eee3005b3af79373a193667fdc3a 6640 linux_6.15.1-1~exp1_source.buildinfo
Checksums-Sha256:
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Files:
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