Red Hat Bugzilla – Bug 135204
mistake in speed detection of DELL's D800 Dothan processor
Last modified: 2015-01-04 17:10:28 EST
Description of problem:
DELL's D800 BIOS A11.
Processor speed detected at boot time: 600Mhz.
-> platform_limit set to 600Mhz
Processor max speed detected by ACPI: 1.7Ghz
SpeedStep unable to change the processor speed to the high speed
detected by ACPI coz of platform limitation.
But Level2 cache detection works with these patches.
Version-Release number of selected component (if applicable):
Kernel-2.6.8-1.521 + dothan patches
just add these 3 patches to 2.6.8-1.521 kernel src and rebuild the
kernel. Boot on the new one.
Steps to Reproduce:
Please verify that speedstep is working as expected with the latest
FC3 development kernel. If it is not, then push these patches to
upstream kernel.org, because we are unlikely to patch it ourselves.
Checked with kernel-2.6.8-1.603:
CPU speed detection : 600Mhz.
Level2 cache well detected.
My Thinkpad T41 BIOS must be set to "Userspace" power management
rather than "Max Battery" or "Performance" in order for cpufreq to be
able to change the frequency. Does your BIOS have any such option?
Yes it's in "Userspace" power management configuration..
Was a Hardware bug... sorry.