Kernel Bug Tracker – Bug 6370
cpufreq problems on Pentium-M
Last modified: 2006-04-13 03:45:49 UTC
Most recent kernel where this bug did not occur:
Dell Latitude D600 laptop
Pentium-M 1.6 GHz
1 GB RAM
Default Ubuntu environment, except for stock kernel
A while (could be minutes, hours, days) after I boot my laptop, the speedstep
control stops working correctly. I usually set the governor to ondemand, but
after a while, the speed gets stuck to 600 MHz (instead of 1.6 GHz) and does not
increase when necessary. Even if I then switch to "performance", the speed stays
at 600 MHz. Both /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq and
/proc/cpuinfo indicate 600 MHz, although the gnome cpufreq applet indicates
(wrongly) 1.6 GHz.
Steps to reproduce:
Boot my machine, set policy to "ondemand", wait for a while. I indicated
2.6.12-rc5 as the last kernel where cpufreq worked. While I haven't done much
testing for that (it's an intermittent problem), this version corresponds to the
last time the kernel worked properly with my laptop. Since 2.6.12-rc6, I've been
having the problems described in bugs 6166 and 6266.
Is this problem stll present in kernel 188.8.131.52?
Someone asked me whether the patches are save for backporting to a stable
kernel. Not sure whether this had happened. Be sure all 4 patches (stated in
bug #6331) get added.
I fixed that on a DELL 600. I am quite sure this also fixes other DELL
models(DELL 660 - this one, bug #6266 and bug #6166, Dell inspiron 9300 - bug
#6331, Dell Latitude D800 - bug #6376).
See bug #6331 for further description.
I can't mark the bugs as a duplicates, so I will close them all with a note to
verify the fix for recent kernels.
Ok, I need to assign it to set it as a duplicate ...
*** This bug has been marked as a duplicate of 6331 ***