intel-microcode 20210216 bump request

Unless you want regressions on Skylake D0 and R0 for users that are running with severely outdated firmware, please refer to the 3.20201118.1~deb10u1 of the microcode update.

Keep the microcode for signatures 0x406e3 and 0x506e3 at revision. 0xd6.

Otherwise, it can hang systems where the firmware has versions older (lower) than 0x80 of the microcode.

The proper fix for this is to detect and refuse the update in the kernel, but there is no such patch available yet. Assuming it is not fixable in a future microcode update.

On Sat, Jan 30, 2021, at 12:11, Hans Joachim Desserud wrote:
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--
  Henrique de Moraes Holschuh <email address hidden>

You are advised to keep the microcode for skylake D0 and R0 locked at revision 0xd6 using a microcode revision override when backporting 3.20211118.1.

That is signatures 0x406e3 and 0x506e3. Override to revision 0xd6.

Otherwise, systems with old microcode (lower than 0x80) can hang.

Please consider importing the 20210216 update from Debian where it has been available since February. It contains fixes for INTEL-SA-00381 on Skylake and CascadeLake systems.

Looks like this has been picked up in bug 1927911. Version 3.20210216.1ubuntu1 has been rolled out in the development version, and I suppose it will make its way to the stable releases targeted.

So even though this issue was reported earlier, I'm going to mark this as a duplicate of the other one.