[Bug 37362] New: vgaswitcheroo : switch from intel to ati impossible

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=37362

           Summary: vgaswitcheroo : switch from intel to ati impossible
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.38 and 2.6.39
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: pub at ackak.fr
        Regression: No


Created an attachment (id=61732)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=61732)
lspci -vv

When i use the command "echo DIS > /sys/kernel/debug/vgaswitcheroo/switch", the
screen of my laptop (HP Pavilion dv7) freeze. Impossible to switch to another
tty and if i write a command in the console nothing appears.

If i write "echo IGD > /sys/kernel/debug/vgaswitcheroo/swith", the screen
refreshes and i can use normally my laptop.

I can't disable the intel card in the bios.

the result of the command "cat /sys/kernel/debug/vgaswitcheroo/swith" :
0:DIS: :Pwr:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

The log (/var/log/messages) when i want switch to ATI :
Jun 12 22:11:17 ackak-hp kernel: [  133.005729] fbcon: Remapping primary
device, fb0, to tty 1-63
Jun 12 22:11:17 ackak-hp kernel: [  133.005976] i915: switched off

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