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From: Mikael Pettersson <mikpe@csd.uu.se>
To: Ruben Puettmann <ruben@puettmann.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [APM ERROR-REPORT] APM_DISPLAY_BLANK freezes Thinkpad R40 and Sony Z1 on suspend
Date: Mon, 4 Aug 2003 21:19:56 +0200	[thread overview]
Message-ID: <16174.45532.487890.571664@gargle.gargle.HOWL> (raw)
In-Reply-To: <20030804180559.GA31178@puettmann.net>

Ruben Puettmann writes:
 > enable CONFIG_APM_DISPLAY_BLANK on linux 2.4.22-pre10 and
 > 2.4.22-pre10-ac1 freeze my Thinkpad R40 with Ati Mobile 7500 and Sony Z1
 > on apm -s.

If you have UP_APIC or SMP enabled, then this is a known user-bug.
CONFIG_APM_DISPLAY_BLANK, CONFIG_APM_CPU_IDLE, and configuring APM
as a module instead of built-in, are known to do really bad things
with regard to BIOSen and the local APIC.

The fix, if you have APIC or SMP support, is to NOT misconfigure APM.

/Mikael

      reply	other threads:[~2003-08-04 19:20 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-04 18:05 [APM ERROR-REPORT] APM_DISPLAY_BLANK freezes Thinkpad R40 and Sony Z1 on suspend Ruben Puettmann
2003-08-04 19:19 ` Mikael Pettersson [this message]

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