Ubuntu
linux package

  1. Bug #1290110
  2. Comment #38

Comment 38 for bug 1290110

Revision history for this message
In , jernej.jakob (jernej.jakob-linux-kernel-bugs) wrote :

Hello everyone,

I can confirm this bug as well on an HP Probook 4710s. So there are now at least 5 confirmed reports.

Please see:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1290110 (my bug report)
http://lkml.iu.edu//hypermail/linux/kernel/1404.0/02012.html (my archived post to the linux-kernel mailing list)

It would be worth to also take a look at the DSDT, as there are other minor quirks on my system that could point there... (brightness always on max after reboot/suspend, coarse brightness setting range)
I've already disassembled mine but am stumped at what to do next (this is my first look at anything ACPI related), how to debug...

But as previous kernels worked okay with this same DSDT, maybe they didn't control the fan speed through ACPI but left it to the BIOS?

For info on disassembling the DSDT see https://wiki.archlinux.org/index.php/DSDT