kernel-packages team mailing list archive

[Chris Bainbridge <chris.bainbridge@xxxxxxxxx>]

> We found a Pentium M 1.70 GHz which does not work with forcepae. It gives the following output from
> 
> cpuid|grep ^00000001
> 
> 00000001 000006d6 00000816 00000180 afe9fbbf

What happens when you try to boot with forcepae? Do you get an error
message? Black screen?

In the wiki you have mentioned "afe9fbbf for both of the CPUs that lack
PAE capability" but the 1.2GHz that was reported to not work has cpuid
"a7e9fbbf" and the 1.7Ghz "afe9fbbf" which are different (a7,af)

Compiling a non-PAE kernel is trivial - you just need to `apt-get source
linux-image`, set CONFIG_X86_PAE=y in .config then `dpkg-buildpackage -b
-uc`. You could easily automate this from a 32-bit 14.04 daily cron job
that checks whether there is a new kernel version, and if so rebuild the
kernel and pushes the result to a PPA (which would have to be enabled by
default in Lubuntu or whatever).

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/930447

Title:
  Unable to start Ubuntu 12.04 live CD with syslinux loader on Pentium M
  x86 Laptop due to bug in PAE kernel, initramfs or syslinux

Status in “linux” package in Ubuntu:
  Fix Released
Status in “syslinux” package in Ubuntu:
  Invalid
Status in Baltix GNU/Linux:
  Triaged

Bug description:
  Ubuntu 12.04 doesn't start from Desktop CD or USB with syslinux boot
  loader on Pentium M 1.6Ghz or faster Pentium M CPU - displays error
  message about missing PAE feature in CPU, but *the same* *Ubuntu
  12.04* Desktop CD/LiveUSB starts fine on *the same CPU* (and same PAE
  kernel) if GRUB boot loader is used, for example when WUBI or LiveUSB
  with GRUB boot loader, like Multisystem
  (http://liveusb.info/dotclear/index.php?pages/install ) is used!

  The error message is:
  "This kernel requires the following features not present on the CPU: pae.
  Unable to boot - please use a kernel appropriate for you CPU."

  THIS IS AN IMPORTANT REGRESSION! People are able to install and successfully use Ubuntu 12.04 on such pretty new hardware, like IBM Thinkpad T42 laptop with Pentium M 1700Mhz processor, but the bug in syslinux (or something related) forbids Ubuntu 12.04 installation.
  This bug is reproducible on lots of computers, there are several log files and /proc/cpuinfo file attached to this bugreport, AFAIK it's enough to reopen this bug.

  ---
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  MachineType: IBM 2373PPU
  dmi.bios.date: 06/18/2007
  dmi.bios.vendor: IBM
  dmi.bios.version: 1RETDRWW (3.23 )
  dmi.board.name: 2373PPU
  dmi.board.vendor: IBM
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: IBM
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373PPU:pvrThinkPadT42:rvnIBM:rn2373PPU:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
  dmi.product.name: 2373PPU
  dmi.product.version: ThinkPad T42
  dmi.sys.vendor: IBM

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