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Old 11-20-2008, 01:58 PM
Zachary Amsden
 
Default Ubuntu 8.04 / 8.10 graphics detection changes?

Hi, I'm triaging a VMware related Ubuntu bug where the Ubuntu desktop
fails to load, and will only run in low-graphics mode if VMI is enabled
when running in a virtual machine. Notably, the bug only happens on AMD
hosts; Intel machines are unaffected. Also, it does not occur in 8.04,
but it a regression observed in 8.10. This leads me to suspect some
kind of CPUID type detection was added between the two that could
possibly be misvirtualized when running with paravirtualization.

Could someone point me to the right place to be looking at how graphics
mode selection selection might have changed between these two?

Thanks,

Zach


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Old 11-24-2008, 02:26 PM
Tim Gardner
 
Default Ubuntu 8.04 / 8.10 graphics detection changes?

Zachary Amsden wrote:
> Hi, I'm triaging a VMware related Ubuntu bug where the Ubuntu desktop
> fails to load, and will only run in low-graphics mode if VMI is enabled
> when running in a virtual machine. Notably, the bug only happens on AMD
> hosts; Intel machines are unaffected. Also, it does not occur in 8.04,
> but it a regression observed in 8.10. This leads me to suspect some
> kind of CPUID type detection was added between the two that could
> possibly be misvirtualized when running with paravirtualization.
>
> Could someone point me to the right place to be looking at how graphics
> mode selection selection might have changed between these two?
>
> Thanks,
>
> Zach
>
>

Zach,

I implemented a series of patches from Alok Kataria for Hardy (8.04)
that use the LFENCE instruction as a performance improvement alternative
to CPUID. I assume these were carried into 2.6.27, though its hard to
tell with the continued rework if the x86/x86_64 code.

Intrepid is pretty close to stock 2.6.27 in the arch/x86 and kernel
directories. I assume you don't see any issues with vanilla 2.6.27?

rtg
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Tim Gardner tim.gardner@canonical.com

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