Which kernel is best for AMD C60?

Art Edwards edwardsa at icantbelieveimdoingthis.com
Sun Apr 1 17:31:08 UTC 2012

On 03/31/2012 04:39 PM, Liam Proven wrote:
> On 31 March 2012 18:53, Art Edwards
> <edwardsa at icantbelieveimdoingthis.com> wrote:
>> On 03/31/2012 03:00 AM, Liam Proven wrote:
>>> On 31 March 2012 07:57, Art Edwards
>>> <edwardsa at icantbelieveimdoingthis.com> wrote:
>>>> I have installed oneiric on an Acer Aspire 1 with amd dual core c60
>>>> processor. The kernel chosen automatically during install is a -pae
>>>> version. I thought that pae was "physical address extension"
>>> Correct.
>>>> that is
>>>> special hardware that allows a 32 bit processor to access a 64 bit
>>>> address space.
>>> Wrong.
>>> PAE allows a 32-bit kernel to access more than 4GB of RAM by paging
>>> small amounts of the RAM above 4GB into the memory area below 4GB. It
>>> does not use any 64-bit technology, features or anything. It is
>>> analagous to LIM-spec expanded RAM in MS-DOS.
>>>>  When I look on the web for information about the
>>>> processor, the spec's say it is a 64 bit processor. So, did the
>>>> installer choose the correct kernel?
>>> The installer cannot choose between kernels - unlike on Mac OS X,
>>> Linux uses a whole different system for 32-bit or 64-bit operation.
>>> The 64-bit version is a different download and all the programs are
>>> compiled for 64-bit operation. If you're booting off a 32-bit CD, then
>>> all the available kernels and all the binaries on that CD are compiled
>>> for 32-bit.
>> Right.
>>> The only way to change between 64-bit and 32-bit on any Linux distro
>>> is to wipe and reinstall - or dual-boot between the two.
>> I assume that the wipe does not have to include the home directory.
> Correct. If you put /home on its own partition, then you can share a
> single home directory - i.e. the same user account - between 32-bit
> and 64-bit versions, I believe.
>>>> I'm having major stability issues--
>>>> the system often freezes on the login screen, requiring a hard shutoff
>>>> and reboot. I'm wondering if this is a symptom of the wrong kernel.
>>> Sounds like hardware problems to me, I fear. Overheating is a common
>>> issue on portables.
>> Actually, this happens immediately on startup. Also, W7 is running fine
>> on the machine. I now have the choice or installing natty or oneiric. My
>> son's Aspire One is running very happily on natty, with none of the
>> stability issues I'm finding with oneiric. I'll post my experience with
>> natty here.
> Oh! My, that's strange. Probably not hardware, then - although CPU
> throttling works differently on Windows and Linux, so it's not
> /entirely/ out of the question.
> Definitely might be worth trying a few variants, then.
So, the C60 /is/ a 64 bit processor. Furthermore, after doing a little
bit more searching, I found a true solution to the instability problem.

1. Create the file /etc/modprobe.d/ath9k.conf

Insert a single line:

options ath9k nohwcrypt=1

2. Specifically for the Aspire One 722, in the BIOS, you have to promote
the Network boot to the top of the boot priority list.

These two steps came from


from Jaime Alberto Silva and Joseph Salisbury.

Thanks to both! My netbook is now fully functional.

Art Edwards
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