CPU for generic-pae kernel should be raised to M686

Bug #592495 reported by Yuhong Bao on 2010-06-11
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
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Bug Description

The CPU for the generic-pae kernel should really be raised to M686, like the old server kernel was. Before Lucid was released, that kernel was raised to M586TSC to fix bug #519448. There is no x86 CPU that supports PAE that would not support the features like CMOV that is necessary for M686, and yes I have checked way beyond Intel/AMD.

Jeremy Foshee (jeremyfoshee) wrote :

Hi Yuhong,

Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains, please run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 592495

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

tags: added: needs-kernel-logs
tags: added: needs-upstream-testing
tags: added: kj-triage
Changed in linux (Ubuntu):
status: New → Incomplete
Yuhong Bao (yuhongbao-386) wrote :

This is a kernel configuration bug, which is why debug logs are not provided.

tags: removed: needs-kernel-logs needs-upstream-testing
Changed in linux (Ubuntu):
status: Incomplete → Triaged
tags: added: kernel-core kernel-needs-review
Andy Whitcroft (apw) on 2010-07-12
tags: added: kernel-reviewed
removed: kernel-needs-review
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 2.6.35-10.15

---------------
linux (2.6.35-10.15) maverick; urgency=low

  [ Leann Ogasawara ]

  * Revert "SAUCE: ensure vga16fb loads if no other driver claims the VGA
    device"
  * [Config] Enable CONFIG_M686=y
    - LP: #592495

  [ Upstream Kernel Changes ]

  * tracing: Add alignment to syscall metadata declarations
 -- Leann Ogasawara <email address hidden> Tue, 20 Jul 2010 18:18:49 +0200

Changed in linux (Ubuntu):
status: Triaged → Fix Released
Martin-Éric Racine (q-funk) wrote :

However, unless I'm mistaken, doing this would prevent the kernel from running on a Geode LX.

Yuhong Bao (yuhongbao-386) wrote :

No, it wouldn't. And even if it did, I was advocating the change to M686 only for the generic-pae kernel exactly because of the need for the generic kernel to be compatible with old CPUs.

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