linux-kernel - Re: Patch needed for ASUS EEEPC 701 2.6.27 (perhaps a regession)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <48F45D52.2010407@tuffmail.co.uk>
Date:	Tue, 14 Oct 2008 09:50:26 +0100
From:	Alan Jenkins <aj504@...dent.cs.york.ac.uk>
To:	Pavel Machek <pavel@...e.cz>
CC:	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	Robert Goldner <robert@...79.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux acpi <linux-acpi@...r.kernel.org>,
	linux-stable@...r.kernel.org
Subject: Re: Patch needed for ASUS EEEPC 701 2.6.27 (perhaps a regession)

Pavel Machek wrote:
> On Sat 2008-10-11 15:50:21, Alan Jenkins wrote:
>> Robert Goldner wrote:
>>
>>> Hi,
>>>
>>> I am a happy user of an asus eeepc 701 with an self-made kernel 2.6.27.
>>> Its working quite good, but there is one patch needed to avoid problems
>>> related to ACPI and Hotkeys.
>>> After using a few hotkeys there comes a message in syslog like:
>>> ACPI: EC: GPE storm detected, disabling EC GPE
>>> and no hotkey event is recognized any more. This is quite bad on a nettop.
>> Hi, I reported the original bug.  It is a regression, though the issue
>> has been present for a few kernel versions now.
>>
>> I recommend that you avoid reproducing the problem.  I now have to add
>> "noapic" to the boot options on my EeePC, otherwise it randomly hangs /
>> reboots when I press hotkeys - I think it  damaged the hardware.
> 
> I guess your hw went bad for some other reason. Restore original
> system and if it is still broken, RMA?
> 

It could be a coincidence.  But it's suspicious enough to advise caution.  We know what the bug is, and we have a very nice workaround queued up now.  There's no reason to test any more of these specific systems to destruction :).

I did try re-installing off the vendor DVD and it was still broken.  I fear I bought it from the wrong place to get sympathetic _frontline_ support / warrantee.  I'm not interested in RMA back to Asus - too much work and downtime for a cheap system, when I have an easy workaround.  I haven't noticed any problems with "noapic".

The symptoms strongly suggest overflow in an event buffer or counter maintained by the Embedded Controller.  So the EC firmware may have a bug, of the sort that results in "unspecified behaviour".  A bug in a special purpose (read: not subject to wide testing) subsystem which has direct connections to things like frequency and voltage control.

Hopefully I'm wrong, and I don't really know what I'm talking about here.

Regards
Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/