Public bug reported:
Prerequisite: installed nvidia proprietary drivers, bumblebee and
bbswitch-dkms packages.
When the system boots up the fan is running in normal mode. Log in to
system and the fan stops even if temps are > 60° (it should be turned on
at ~50° as of bios settings); it will go up and up until it reaches very
hot temperatures and starts throttling (>=85°). Just issue 'sudo tee
/proc/acpi/bbswitch<<<ON' and the fan starts magically. Reverting it to
OFF shuts down the fan. This is a dangerous bug. I'm not sure it's into
bbswitch but it's clearly related to it.
Release Elementary OS Freya 0.3
bbswitch-dkms version: 0.7-2ubuntu1
acerhdf modules is not loaded
Packages installed: thermald, intel_pstate, tlp (starting/stopping thermald
does nothing about fan rotation)
Kernel load params: acpi_osi=Linux acpi_backlight=vendor intel_pstate=enable
pcie_aspm=force
BIOS version 1.21
** Affects: bbswitch (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
Prerequisite: installed nvidia proprietary drivers, bumblebee and
bbswitch-dkms packages.
When the system boots up the fan is running in normal mode. Log in to
system and the fan stops even if temps are > 60° (it should be turned on
at ~50° as of bios settings); it will go up and up until it reaches very
hot temperatures and starts throttling (>=85°). Just issue 'sudo tee
/proc/acpi/bbswitch<<<ON' and the fan starts magically. Reverting it to
OFF shuts down the fan. This is a dangerous bug. I'm not sure it's into
bbswitch but it's clearly related to it.
Release Elementary OS Freya 0.3
bbswitch-dkms version: 0.7-2ubuntu1
acerhdf modules is not loaded
Packages installed: thermald, intel_pstate, tlp (starting/stopping thermald
does nothing about fan rotation)
Kernel load params: acpi_osi=Linux acpi_backlight=vendor intel_pstate=enable
pcie_aspm=force
+
+ BIOS version 1.21
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https://bugs.launchpad.net/bugs/1472965
Title:
Setting bbswitch to OFF prevents fan to run on Acer 5755G
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