Bug 134104

Summary:	Problem with the embedded controller
Product:	[openSUSE] SUSE LINUX 10.0	Reporter:	Georges A.K. <dgege1>
Component:	Kernel	Assignee:	Thomas Renninger <trenn>
Status:	RESOLVED DUPLICATE	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None
Version:	Final
Target Milestone:	---
Hardware:	x86
OS:	Other
Whiteboard:
Found By:	Other	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Georges A.K. 2005-11-17 04:29:31 UTC

I have a problem with my embedded controller. My system is an Acer Ferrari 3000. The problem is that the events are delayed. For example, if I unplug the adapter, the system doesn't react. I have to replug and unplug again quite a few times then it does. It's the same thing for adjusting the screen brightness (it's a special function key). ec_burst doesn't change anything with the SuSE kernel. However, being the curious that I am, I compiled a vanilla kernel with the latest ACPI patches and when enabling ec_burst, the problem disappears ! And the problem is also inexistant under KUbuntu. Therefore, there's something missing from the SuSE kernel. Maybe someone with more knowledge can pin point it ?

Thanx,
Georges.

Comment 1 Greg Kroah-Hartman 2005-11-17 06:37:10 UTC

What do you mean "emabling ec_burst"?

And does a kernel.org 2.6.14 kernel work properly for you?  Or do you require
the latest ACPI tree patches too?

Comment 2 Georges A.K. 2005-11-17 20:55:14 UTC

I'm gonna install 10.1 alpha3 tonight which comes with 2.6.14. If it doesn't work, I'll compile a vanilla kernel and try it. If it doesn't work, I'll add the latest ACPI patches and this configuration should work (it worked last time I tried).
Oh, and by enabling ec_burst, I mean I'm passing ec_burst=1 as a kernel parameter at boot time. As far as I know, the SuSE kernels have a patch that enable ec_burst by default.

I'll get back with the results soon.

Georges.

Comment 3 Georges A.K. 2005-11-18 17:51:52 UTC

ok I just finished installing 10.1 alpha3 and there's improvement. When I'm plugged in, everything works perfectly (no delays). I can adjust the brightness and turn off the backlight no problem. But, when I unplug and go on battery, the delays comes back. It's like if the events are getting buffered and executed 4 or 5 events later.
Any idea why ?

Georges.

Comment 6 Stefan Behlert 2005-11-21 10:26:19 UTC

Thomas, you did a lot of work and testing regarding ec_burst, any idea?

Comment 7 Georges A.K. 2005-11-21 19:40:44 UTC

I just wanted to let you know that I opened a bug report in the kernel bugzilla :
http://bugzilla.kernel.org/show_bug.cgi?id=5633

Thanks,
Georges.

Comment 8 Georges A.K. 2005-11-23 17:13:55 UTC

I just compiled a vanilla 2.6.14.2 with ec_burst=1 and it works flawlessly. Events are executed instantly whether my laptop is plugged in on running off the battery. So I suppose there's a kernel patch in the SuSE kernel that's screwing up something. Any idea what that might be ?

Comment 9 Thomas Renninger 2005-12-08 18:06:39 UTC

I hope I find a smaller patch to add to 10.0 soon ...

*** This bug has been marked as a duplicate of 61106 ***