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So, I have this problem on lenovo ideapad y460, with hybrid graphics
(AMD 5650 and intel) on ubuntu 12.10 with preinstalled open-source video
drivers.
To reproduce bug on my system:
1) switch off discrette videocard using vgaswitcheroo:
kirill@lenovo:~$ sudo -s
[sudo] password for kirill:
root@lenovo:~# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
root@lenovo:~# cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :Off:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0
2:DIS-Audio:+:Off:0000:01:00.1
root@lenovo:~#
2) switch to any TTY using ctrl+alt+F1..F6
3) switch back to X-server using ctrl+alt+F7
After that I see the scree in state I leave it, but in frost state (for
example, I can open gif animation, switch to TTY and back, and after I
have static image on screen). Also I can't use keyboard and mouse.
If I try to go to the TTY and back with discrette videocard switched on,
it works fine.
I have that bug on 12.10 and 13.04. But 10.10, 11.04, 11.10 and 12.04
work great.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: 12.10 bot-comment
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system hangs when switching between TTY and X (12.10)
https://bugs.launchpad.net/bugs/1155501
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