Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)”

From	Al Ma <AlMa0@ro.ru>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)”
Date	2026-09-11 22:40 +0200
Message-ID	<NCgcp-gBCe-3@gated-at.bofh.it> (permalink)
References	(3 earlier) <NxPNv-ebtr-3@gated-at.bofh.it> <NxPNv-ebtr-1@gated-at.bofh.it> <NCgcp-gBCe-5@gated-at.bofh.it> <LijTX-6zGq-1@gated-at.bofh.it> <NCgcp-gBCe-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Awesome!

Below, I'll comment on whatever I can meaningfully comment.

> * Short term, you want to blacklist the ee1004 driver on your system.
>    It is not a good idea to load a driver which binds to the wrong
>    device.

Here we go, following https://wiki.debian.org/KernelModuleBlacklisting:

$ echo "blacklist ee1004" | sudo tee /etc/modprobe.d/ee1004.conf
blacklist ee1004
$ sudo depmod -ae
depmod: WARNING: -e needs -E or -F
$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-6.12.107+deb13-amd64

Can the above warning be ignored?

> * Still mid term, we probably want to blacklist SPD probing explicitly
>    for your motherboard (we'll need to know the contents of
>    /sys/devices/virtual/dmi/id/board_vendor and
>    /sys/devices/virtual/dmi/id/board_name on your system). Maybe this
>    can be implemented as an empty entry in mux_dmi_table (as in, we know
>    the board requires multiplexing, but we don't know yet to implement
>    it on that board).

Here we go:

$ cat /sys/devices/virtual/dmi/id/board_vendor
ASUSTeK COMPUTER INC.
$ cat /sys/devices/virtual/dmi/id/board_name
WS C422 PRO_SE

> * Long term, we need the hardware vendor to provide technical
>    information about the board so that we can implement SMBus
>    multiplexing support in the i2c-i801 driver (if that's really how
>    things are implemented on your board - that's only a guess from me at
>    this point). Asus provided information about their Z8 series long ago
>    and I was able to add support for it back then. It would be wonderful
>    if they could provide similar information about the WS C422 PRO/SE so
>    that a kernel developer can add support.
> 

The user manuals for the board lie at https://www.asus.com/de/motherboards-components/motherboards/workstation/ws-c422-pro-se/helpdesk_manual?model2Name=WS-C422-PRO-SE .

As for anything deeper, it would be better if you, as a developer, contacted them directly. (In fact, the last time I actually succeeded in issuing a ticket was a long time ago, before the warranty ran out.) An ASUS support contact form lies at https://www.asus.com/support/product/contactus/services/questionform .

Thread

Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Al Ma <AlMa0@ro.ru> - 2026-08-25 02:40 +0200
  Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Al Ma <AlMa0@ro.ru> - 2026-08-30 17:40 +0200
    Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Al Ma <AlMa0@ro.ru> - 2026-09-11 22:40 +0200
      Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Uwe Kleine-König <ukleinek@debian.org> - 2026-09-23 16:10 +0200
        Bug#1110749: Typo correction: Re: Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Al Ma <AlMa0@ro.ru> - 2026-09-26 16:10 +0200
        Bug#1110749: ee1004: DDR4 SPD cannot be read, decode-dimms fails, “Failed to select page 0 (-6)” Al Ma <AlMa0@ro.ru> - 2026-09-26 16:10 +0200

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