[Bug 69365] New: vgaswitcheroo crashes when passing "OFF" to the "switch" file

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69365

          Priority: medium
            Bug ID: 69365
          Assignee: dri-devel at lists.freedesktop.org
           Summary: vgaswitcheroo crashes when passing "OFF" to the
                    "switch" file
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lbdkmjdf at sharklasers.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

I have an HP laptop with dual AMD graphics cards (radeon HD 6520g + HD 6750M)
running Ubuntu 13.10 beta1, kernel 3.11.0-7-generic amd64.
This command
# echo "OFF" > /sys/kernel/debug/vgaswitcheroo/switch
throws a WARNING in the kernel logs, after which the folder
/sys/kernel/debug/vgaswitcheroo/ and the dGPU disappear (as noted in the logs)
(and power usage is notably lowered, guessing from the temperatures).

dmesg: http://pastebin.com/Pb7ELyqP , lines 1196+

Someone else in the #radeon channel also found this report:
http://lists.freedesktop.org/archives/dri-devel/2013-September/045157.html
which links to another old report from the same person.

Thanks.

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