[Bug 59785] [dual-gpu regression] Display shuts off when switching to discrete graphics card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59785

--- Comment #26 from sfievet <sebastien.fievet at free.fr> ---
I have a 3820TG intel Ironlake/radeon 6550M hybrid laptop, and I am affected by
this bug too. I tried your "drm/i915: do not disable backlight on vgaswitcheroo
switch off" patch on kernel 3.11-rc3 and it works.

I have been able to switch from integrated to discrete and back with success.
...But only 3 times :-( 

I did the following sequence :
step #1 : login to X on integrated (intel HD)
    cat /sys/kernel/debug/vgaswitcheroo/switch 
    0:DIS-Audio: :Pwr:0000:02:00.1
    1:IGD:+:Pwr:0000:00:02.0
    2:DIS: :Pwr:0000:02:00.0
    echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch

step #2 : login to X on discrete (radeon 6550M)
    cat /sys/kernel/debug/vgaswitcheroo/switch
    0:DIS-Audio: :Pwr:0000:02:00.1
    1:IGD: :Off:0000:00:02.0
    2:DIS:+:Pwr:0000:02:00.0
    echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch

step #3 : login to X on integrated (intel HD)
    cat /sys/kernel/debug/vgaswitcheroo/switch
    0:DIS-Audio: :Off:0000:02:00.1
    1:IGD:+:Pwr:0000:00:02.0
    2:DIS: :Off:0000:02:00.0
    echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch

This time the radeon messes up the display immediately, i.e. it happens before
I logout from X. But that's a nice improvement!

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