Re: ANNOUNCEMENT: Intel/AMD x86 CPU microcode update system in non-free
On Tue, 06 Nov 2012, Jon Dowland wrote:
> On Mon, Nov 05, 2012 at 06:12:53PM -0200, Henrique de Moraes Holschuh wrote:
> > Microcode updates will be applied immediately when the microcode
> > packages are installed or updated: you don't have to reboot. You will
> > have to keep the packages installed, though: as explained above, the
> > microcode updates have to be reapplied at every boot.
> > You can check which version of the microcode your processors are running
> > by looking for "microcode" lines on /proc/cpuinfo. This information is
> > only available on recent kernels (such as the Wheezy kernel).
> This did not appear to work for me automatically. I did not upgrade my kernel
> in the same aptitude session.
That can also happen if you upgrade it in a previous aptitude session, but
didn't reboot yet.
> > microcode : 0x1b
> After installing intel-microcode and iucode-tool 0.8.3-1:
> > microcode : 0x1b
> > # iucode_tool --scan-system -vv
> > iucode_tool: cpuid kernel driver unavailable, cannot scan system processor signatures
Hmm, that should happen only if iucode-tool is installed/configured after
Still, it did lead me to a possible cause: I am not trying to modprobe
"microcode" in the intel-microcode postinst. This can indeed cause the
failure to update microcode at package install time.
I forget why I didn't do it that way in the first place, but that's easily
fixed. Please file a bug, severity minor. I will check for any possible
problems it might cause, and if I can't find any, I will fix it in unstable.
Still, those reports are very valuable. I will probably try to get some
information about the microcode updates on the Wheezy release notes, and
this thread will go a long way to make sure no pitfals are left behind.
> > $ grep microcode /proc/cpuinfo
> > microcode : 0x28
And that's why these packages exist... although you might want to check if
your motherboard vendor has a BIOS/UEFI update available, as it is _always_
better to have microcode updated as early as possible, and that means the
> Shall I file a bug?
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them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot