[Bug 61891] New: Cannot switch off Radeon 6400M with vgaswitcheroo

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=61891

            Bug ID: 61891
           Summary: Cannot switch off Radeon 6400M with vgaswitcheroo
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.12-rc1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: madcatx at atlas.cz
        Regression: No

Created attachment 109251
  --> https://bugzilla.kernel.org/attachment.cgi?id=109251&action=edit
dmesg

I use systemd's tmpfiles to power off the Radeon DIS early during boot to save
power. This works fine with kernel 3.11.1 but it breaks with 3.12-rc1. I
removed the systemd rule and tried to power the card off manually (echo OFF >
/sys/kernel/debug/vgaswitcheroo/switch). I got a kernel warning and
vga_switcheroo died. See the attached file for full dmesg dump.

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