See
http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=K04R3fileId=3450461628osCode=W764productCode=latitude-e6540-laptoplanguageCode=ENcategoryId=BI
The latest BIOS A14 from April 2015 has this single note:
- Fixed CPU may be limited at low speed after resume from standby
Philippe Ombredanne, please see
https://help.ubuntu.com/community/BIOSUpdate#FAQ .
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https://bugs.launchpad.net/bugs/1260112
Title:
[Dell Latitude E6540] CPU stuck on minimum frequency
http://www.williambharding.com/blog/technology/fixed-my-i7-intel-dell-
laptop-is-ridiculously-slow/ seems to suggest a workaround : unsetting
the speedstep option in the BIOS.
It seems to be working on mine with a Debian wheezy install.
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Attention regarding previosu comment #32 : I've experienced a strange
and dangerous looking power down when using a 65W adapter after I
disabled the speedstep BIOS option, while the machine was on heavy duty
(ripping video)... so change the BIOS setting at your own risk !
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The same issue occurs when the laptop is installed with Windows 7.
I think that it is not related with SO but with some BIOS feature.
This laptop requires its own AC unit with 130W. If you use a lower power
supply (but DELL also), the CPU performanc goes bellow 800Mgh.
But... I suspect a bug on
domink, thank you for your comment. So your hardware and problem may be
tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into a Ubuntu repository kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please read the
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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Gonçalo Marrafa, this would be pending the results of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1260112/comments/23
(live environment would be fine).
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Guys, any news regarding this matter? Are there any developments
regarding this issue? Is there something else we can do to help identify
the problem?
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@penalvch :
I got the same profesionnal DELL laptop and the same issue with Precise.
On AC or battery, cur_freq is sticked to 80. I tried to remove cpufreq
tools, but nothing changed.
The strange part is when I plug my laptop on my Dell dock at the office,
power strategies are working
FRnunurs, thank you for your comment. So your hardware and problem may be
tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into a Ubuntu repository kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please read the
I can't tell. The computer is new and the only distro i've installed on
it is Saucy.
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https://bugs.launchpad.net/bugs/1260112
Title:
[Dell Latitude E6540] CPU stuck on minimum
Gonçalo Marrafa, for regression testing purposes could you please test
for this in Precise via http://releases.ubuntu.com/precise/ and advise
to the results?
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I'm sorry, i can't. This is my work machine and i can't afford
constantly changing OS. I can't help with that. Hope someone else who
has the same issue can do it.
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