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[Bug 1176322] Re: Crash on vgaswitcheroo is off


em, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1176322

** Package changed: ubuntu => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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  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

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