On Friday 26 October 2012, H. Peter Anvin wrote:

My guess is that Windows explicitly enables A20 on resume.  We should do
that too, really... with the current heavily unified realmode code it
should be easy - let me hack up a patch in the morning.

Neither s3_beep nor s3_leds (this patch: 
https://lists.ubuntu.com/archives/kernel-team/2011-May/015621.html ) worked 
for me so I thing that BIOS breaks on resume before we can do anything.

Robert Hancock [off-list ref] wrote:

quoted

On 10/24/2012 02:09 PM, Alan Cox wrote:

quoted

On Wed, 24 Oct 2012 12:36:04 -0700

"H. Peter Anvin" [off-list ref] wrote:

quoted

Minor concern: it should do the wait for ready before sending each

command.

quoted

Can we get a command line to do this quirk too - it strikes me that

if

quoted

the MSIs rely upon it then it may be something Windows always does so
will be useful to try on other problem machines as an experiment.

I agree, one has to keep in mind the age-old question "how does Windows

work?" since it surely has no such quirk. I'd say we're sometimes too
quick to add these DMI quirks when a more general solution would be
somehow figure out how the Linux behavior differs from what Windows is
doing.

-- 
Ondrej Zary