[Bug 60606] New: vga_switcheroo / new Radeon DPM code mess up fbcon

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60606

            Bug ID: 60606
           Summary: vga_switcheroo / new Radeon DPM code mess up fbcon
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.11.0-rc2
          Hardware: All
                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: sebastien.fievet at free.fr
        Regression: No

Created attachment 106987
  --> https://bugzilla.kernel.org/attachment.cgi?id=106987&action=edit
radeon switch OFF / switch ON experiment

I am the happy owner of an hybrid Intel core i5 480M / AMD Radeon 6550M latop.
- IGP is Intel ironlake
- DGD is AMD radeon 6550M

I just installed kernel 3.11.0-rc2.
switching the discrete GPU OFF via the vgaswticheroo works from within X or
from the console :
  echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
  cat /sys/kernel/debug/vgaswitcheroo/switch 
  0:IGD:+:Pwr:0000:00:02.0
  1:DIS: :Pwr:0000:02:00.0
  2:DIS-Audio: :Pwr:0000:02:00.1

I then tried to switch the radeon back ON from the console with X down :
  echo ON > /sys/kernel/debug/vgaswitcheroo/switch

It messed up the console display : screen turned to dominant grey scattered
with coloured pixels making it unreadable, forcing me to reboot.
The attachment is the excerpt of my kern.log file for my radeon switch OFF /
switch ON experiment.

switch off is at [   76.634983]
switch on is at  [ 2167.936488] or [ 2167.936517] 

I also noticed :
[    5.457569] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch -
Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
[    5.457739] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch -
Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)

which seems to be related to vgaswitcheroo setup, but I don't know if it's
relevant or not.

Let me know if you need anything else.
thanks for your help,
Seb.

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