Re: a problem about the two patches in bug 10724 & 11428

[Alexey Starikovskiy <astarikovskiy@suse.de>]

Henrique de Moraes Holschuh wrote:
> On Mon, 01 Sep 2008, Zhao Yakui wrote:
>>     Will the above two patches hit the upstream kernel? If the above two patches hits the upstream kernel, it 
>> seems that the boot option of "ec_intr=" comes back again and EC can't be switched from interrupt mode to polling 
>> mode if EC GPE interrupt is missing. In such case maybe the battery/AC/thermal driver can't work well if the info of
>> battery/AC/thermal is related with EC. Maybe there exists the regression on some laptops.
> 
> Right now, the fact that it gives up on interrupt mode too easily IS causing
> regressions on ThinkPads (like the T43 I own).  Since polling mode does
> work, it is just a performance regression, so you won't get many reports
> about it since most people don't look for such stuff in their kernel logs.
> 
> Some ECs trigger the interrupt/poll-mode checks just on small windows
> (typically during resume -- might even be a bug somewhere in ACPICA or
> Linux, and not on the EC).  We should not be giving up using interrupt mode
> on these so easily.  Maybe retry enabling interrupt mode after some seconds
> a few times (like 3 or 5)?  If it is a transient problem, that will avoid
> the permanent performance regression of polled mode.
Right, I am considering this option too.

Thanks,
Alex.