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September 20th, 2015 04:00
XPS9333: High trackpad consuption
I have a dellXPS 9333 developer edition.
My kernel is:
$ uname -a
Linux zah-XPS13-9333 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
which should have upstreamed many of the issues. When I run powertop, I find that the trackpad is consuming an unbelievably high amount of energy (up to like 8W when idle) leading to an extremely low battery life.
Power est. Usage Events/s Category Description
7.41 W 15,7 ms/s 3071,5 Interrupt [7] INT33C3:00
How do I fix this?
That's likely a miscalculation. The touchpad consumes quite some power, but not as much as you see. Newer kernel version should behave better.
However, I can see that you are using 3.19, so you are affected by a bug which causes useless interrupts even when the touchpad is not used. The bug was fixed in v4.1 (I think): git.kernel.org/.../hid-rmi.c
These should also help: git.kernel.org/.../hid-rmi.c git.kernel.org/.../hid-rmi.c
As for the other bug mentioned (the gpe* one), we (XPS13 9333) shouldn't be affected by it.
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Posted September 20th, 2015 08:00
Please wait for advice from someone who knows more than I do, but there's a chance this is related to:
http://en.community.dell.com/techcenter/os-applications/f/4613/t/19653472
If you go to that link, and following the link inside there, it will tell you how to disable signals that have a high amount of interrupts that aren't being dealt with. Proceed with caution though.