[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #4 from Igor Murzov <e-mail at date.by>  2011-05-09 21:53:21 ---
@Florian Mickler:

System is not frozen, only screen is black, because active graphical card gets
turned off. I can log into the system via ssh and turn graphics on.

If I do `echo IGD > /sys/kernel/debug/vgaswitcheroo/switch` just after system
boot, I get following new lines in dmesg:

[ 1230.530299] fbcon: Remapping primary device, fb0, to tty 1-63
[ 1230.570734] radeon: switched off
[ 1230.591094] [drm] Disabling audio support
[ 1230.718090] radeon 0000:01:05.0: PCI INT A disabled

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