SRU: https://lists.ubuntu.com/archives/kernel- team/2022-April/129581.html (oem-5.15, jammy, oem-5.17, unstable)
** Description changed: + [SRU Justfication] + + [Impact] + + Intel AX211 iwlwifi -64 firmware may fail to init under reboot stress, + and -67 is immune. FW API -64 supported by oem-5.14, and -67 in v5.16. + Not reproducible on every platform with AX211 installed, and the chances + of such failures vary from one to another. + + [Fix] + + A few solutions were considered. The very first one is to ask Intel to + fix -64 firmware directly, and the answer is a solid no claimed -64 is + not the planned production version of AX211. + + It's also possible to backport FW API from v5.16, but while iwlwifi FW + API is more or less a black box to us and the new FW APIs also depends + on updates on the wireless stack, this is going to be very risky and + actually we had regressions before after such backports. + + The last viable solution is to run backport-iwlwifi-dkms >= rev 8580 on + the effected platforms. This means oem-5.14 and its migration target, + hwe-5.15 will not be able to drive this piece of hw flawlessly without + backport-iwlwifi-dkms installed. + + However, while we need secureboot to be enabled on these platforms, + backport-iwlwifi-dkms must also be signed somehow. There are two + possible method to achieve this, too. One, to prebuild this dkms as zfs + and v4l2loopback does. However, while backport-iwlwifi-dkms generates + kernel modules with exactly the same name as the in-tree ones, when + prebuilt, they'll be available directly from the linux-modules package + and therefore overrides the in-tree ones always, turning the in-tree + driver completely useless and risk the stability of all other generic + installations. + + The second one is to build backport-iwlwifi-dkms as nvidia graphic + drivers in the linux-restricted-modules source package. In this way, + affected platforms may install the corresponding packages when needed + without interfering others. However, l-r-m is for restricted modules + that needs special care of redistribution of its binaries, and + backport-iwlwifi-dkms is GPL licensed. + + Here a similar but simpler process in the main kernel tree is + re-implemented. Two additional packages, + linux-modules-MODULE-PKGVER-ABINUM-FLAVOUR and its meta package + linux-modules-MODULE-FLAVOUR will be created. + + [Test Case] + + Test builds: + ./jammy/amd64/linux-modules-iwlwifi-5.15.0-27-generic_5.15.0-27.28_amd64.deb + ./jammy/amd64/linux-modules-iwlwifi-generic_5.15.0-27.28_amd64.deb + ./unstable/amd64/linux-modules-iwlwifi-5.17.0-8-generic_5.17.0-8.8_amd64.deb + ./unstable/amd64/linux-modules-iwlwifi-generic_5.17.0-8.8_amd64.deb + ./oem-5.17/amd64/linux-modules-iwlwifi-5.17.0-1003-oem_5.17.0-1003.3_amd64.deb + ./oem-5.17/amd64/linux-modules-iwlwifi-oem_5.17.0-1003.3_amd64.deb + ./oem-5.14/amd64/linux-modules-iwlwifi-5.14.0-1033-oem_5.14.0-1033.36_amd64.deb + ./oem-5.14/amd64/linux-modules-iwlwifi-oem_5.14.0-1033.36_amd64.deb + + [Where problems could occur] + + The latest (9858-0ubuntu2) backport-iwlwifi-dkms/jammy actually fails + to build under this proposed process. Debdiff attached to the same + bug. + + Different from nvidia packages built from l-r-m, the generated package + names do not carry an additional short version string, e.g. nvidia-410, + as there is no such necessity to build multiple versions of iwlwifi. + The modules are installed to /lib/modules/<kver>/kernel/iwlwifi, not + iwlwifi-9858/. + + ========== original bug report ========== + [backport-iwlwifi-dkms] Under some circumstances, dkms is invoked as: `/usr/sbin/dkms build --kernelsourcedir ...` and yet the dkms make command in this package has: MAKE="'make' -j$(num_cpu_cores) KLIB=/lib/modules/$kernelver" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1969434 Title: build backport-iwlwifi-dkms as linux-modules-iwlwifi-ABI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/+bug/1969434/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
