[Bug 41340] New: vga_switcheroo doesn't work with AMD Radeon HD 6770M

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41340

           Summary: vga_switcheroo doesn't work with AMD Radeon HD 6770M
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: mlambda at gmail.com


Created an attachment (id=51758)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=51758)
Kernel config

How to reproduce:
cd /sys/kernel/debug/vgaswitcheroo/; echo ON >switch; echo DDIS >switch
Hit Ctrl+Alt+Backspace to restart X-Server

Expected Result:
Switch to discrete GPU

Actual Result:
System freezes, but can be restarted with Ctrl+Alt+Esc

Notebook: HP Pavilion dv7 6104eg
Kernel: latest git kernel (commit d5767c53535ac79758084773418e0ad186aba4a2),
Linux hp 3.1.0-rc8-custom #1 SMP Wed Sep 28 21:23:06 CEST 2011 x86_64 x86_64
x86_64 GNU/Linux
Distribution: Ubuntu 11.04 64bit

lsmod:
Module                  Size  Used by
vboxnetadp             13340  0 
vboxnetflt             28297  0 
vboxdrv               252684  2 vboxnetadp,vboxnetflt
radeon               1016473  0 
iwlagn                311183  0 
ttm                    72079  1 radeon
r8169                  55918  0

If you need any additional information, please tell me!

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