← Back to team overview

kernel-packages team mailing list archive

[Bug 1176322] Re: Crash on vgaswitcheroo is off



I don't have the necessary hardware to test this bug anymore.

To fix this issue I installed bumblebee package. I just posted this so
others will know the solution.

I won't be posting back here, so I guess you can close it.

Thank you,

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  Crash on vgaswitcheroo is off

Status in “linux” package in Ubuntu:

Bug description:
  Even since ubuntu 10.04 there is a issue with vgaswitcheroo that
  bothers me.

  I have an Nvidia-Optimus ready laptop (Dell N5110). I am using
  vgaswitchheroo to disable my dedicated graphics because my laptop
  becomes very hot if i don't do it. I don't install any Nvidia-
  restricted or official drivers because they make my system extremly

  As you can see, vgaswitchheroo is working fine.

  root@em-hax:/# alias | grep nv
  alias nv_of='echo OFF > /sys/kernel/debug/vgaswitcheroo/switch'
  alias nv_on='echo ON > /sys/kernel/debug/vgaswitcheroo/switch'
  root@em-hax:/# sensors | tail -5
  Adapter: PCI adapter
  temp1:        +61.0°C  (high = +95.0°C, hyst =  +3.0°C)
                         (crit = +105.0°C, hyst =  +5.0°C)
                         (emerg = +135.0°C, hyst =  +5.0°C)

  root@em-hax:/# nv_of
  root@em-hax:/# sensors | tail -5
  Adapter: PCI adapter
  temp1:            N/A  (high = +95.0°C, hyst =  +3.0°C)
                         (crit = +105.0°C, hyst =  +5.0°C)
                         (emerg = +135.0°C, hyst =  +5.0°C)

  My issue is the fact that I must enable vgaswitchheroo before i shut
  down my computer. If i don't do it the computer will show a black
  screen and just hang.

  Moreover, with vgaswitchheroo disabled, i will get an instant freeze
  when i want to access tty1 for example (CTRL+ALT+F1).

  Steps to reproduce this issue:
  * Disable vgaswitcheroo on an optimus-capable computer with no nvidia drivers installed
  * Try to shut down the computer OR press CTRL+ALT+F1

  Expected results:
  * Normal shutdown OR go to tty1

  What happens instead:
  * Computer freezes

To manage notifications about this bug go to: