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Bug#307328: marked as done (kernel-source-2.6.11: [powerpc] CPU runs only with half speed on new powerbooks)



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From: Jochen Voss <voss@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: kernel-source-2.6.11: [powerpc] CPU runs only with half speed on new
 powerbooks
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Package: kernel-source-2.6.11
Severity: normal

Hello,

with release 2.6.11-1 of kernel-image-2.6.11-powerpc the CPU runs only
at half of the advertised speed.  The problem is hard to notice,
because /proc/cpuinfo contains the lines

    cpu         : 7447A, altivec supported
    clock       : 1666MHz
    bogomips    : 829.44

which look good at first. But is transpires that the clock entry is
wrong! The thing to look out for is the bogomips value: on a 7447A
processor the bogomips value is approximately equal to the clock
frequency.

The issue is discussed in the debian-powerpc mailing list in the thread
starting at http://lists.debian.org/debian-powerpc/2005/03/msg00554.html .

The problem can be fixed with the Benjamin Herrenschmidt's patch from
http://lists.debian.org/debian-powerpc/2005/03/msg00554.html and
http://lists.debian.org/debian-powerpc/2005/03/msg01008.html .  A
combined version of these two changes is at
http://seehuhn.de/comp/powerbook/#cpufreq-patch .

Kernel specific information about my machine (/proc/cpuinfo contents
etc.)  can be found at http://seehuhn.de/comp/powerbook/2.6.11-1/ ,
general information (about hardware, etc) is at
http://seehuhn.de/comp/powerbook/ .

I hope this helps,
Jochen

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: powerpc (ppc)
Kernel: Linux 2.6.11-powerpc
Locale: LANG=en_GB.iso885915, LC_CTYPE=en_GB.iso885915 (charmap=ISO-8859-15)

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Date: Sun, 7 Aug 2005 11:46:25 +0200
From: Maximilian Attems <debian@sternwelten.at>
To: 307328-done@bugs.debian.org
Subject: Re: kernel-source-2.6.11: [powerpc] CPU runs only with half speed on new powerbooks
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benh usually feeds upstream as upstream kernel hacker.
please reopen if pain subsists with linux image 2.6.12

--
maks



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