Why Does 14.04 Hate AMD?

[Ralf Mardorf]

On Fri, 2014-08-15 at 09:51 +0200, Ralf Mardorf wrote:
> Several Linux PREEMPT RT users with AMD CPUs experienced issues,
> independent of the used disto/WM/DE. The only rt patched kernel I can
> use > 3.8.x is 3.10.47-rt50. Linux-rt <= 3.8.x are ok, but > 3.8 don't
> work on my machine [1], excepted of the 3.10.47 with the 50th patch.
> There were no issues with vanilla kernels <= 3.16.
> 
> To put it in a nutshell, did you test older kernels? Did you disable
> options in GRUB's kernel line or build kernels with new features
> disabled?
> 
> > It seems that AMD64 is a red-headed stepchild for some
> > reason.
> 
> The kernel developer might not have all the AMD hardware they need for
> testing and even if they would have, they perhaps don't have enough
> time. It's up to the community to help debugging kernels. Unfortunately
> I couldn't help, since not only knowledge is needed, but also hardware.
> When the machine logs and there are no useful log files, no debugging
                  locks ;)
> information, connecting another computer by parallel port and things
> like this are needed, to give the developer the information they need.
> 
> Troubleshooting: Did you test another DE, or better a lightweight WM
> that is known to be stable?
> 
> [1]
> # grep "model name" /proc/cpuinfo 
> model name	: AMD Athlon(tm) X2 Dual Core Processor BE-2350
> model name	: AMD Athlon(tm) X2 Dual Core Processor BE-2350
> 
>