[Bug 117131] vga_switcheroo does not switch IGP -> DIS ( IGP == i915 , DIS == radeon )

Tue Apr 26 18:37:02 UTC 2016

https://bugzilla.kernel.org/show_bug.cgi?id=117131

--- Comment #21 from Jason Vas Dias <jason.vas.dias at gmail.com> ---
Aha! It was :

Section "Device"
  Identifier "Intel"
  Driver "intel"
  Option "Monitor-eDP-1" "eDP-1" 
  Option "Monitor-DisplayPort-0" "eDP-1"
EndSection

and also :

 Section "ServerLayout"
        Identifier     "X Intel"
        Screen         0  "Screen0" 0 0
        Inactive       "Radeon"
 ...
 EndSection

That did it! 

X-Server now initializes & xterm displays OK !
( with patch applied to latest xf86-video-intel driver, 
  see : https://bugs.freedesktop.org/show_bug.cgi?id=95140
) 

The Monitor-DisplayPort-0 xorg.conf Device section option
appears to only be documented in online blogs, eg:
 https://wiki.archlinux.org/index.php/multihead
It is not mentioned in any manual page installed by any Xorg package.
Let us eagerly anticipate the release of X11 7.8 and complete documentation ...

But still there are these dmesgs after successfully switching into 
graphics mode with the Intel driver:
[  173.684435] [drm] probing gen 2 caps for device 8086:c01 = 261ad03/e
[  173.684460] [drm] PCIE gen 3 link speeds already enabled
[  173.688244] [drm] PCIE GART of 2048M enabled (table at 0x00000000002E8000).
[  173.688390] radeon 0000:01:00.0: WB enabled
[  173.688405] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000100000c00 and cpu addr 0xffff880414fb6c00
[  173.688436] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr
0x0000000100000c04 and cpu addr 0xffff880414fb6c04
[  173.688465] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr
0x0000000100000c08 and cpu addr 0xffff880414fb6c08
[  173.688495] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr
0x0000000100000c0c and cpu addr 0xffff880414fb6c0c
[  173.689306] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr
0x0000000100000c10 and cpu addr 0xffff880414fb6c10
[  173.690471] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr
0x0000000000075a18 and cpu addr 0xffffc90000435a18
[  173.711357] radeon 0000:01:00.0: fence driver on ring 6 use gpu addr
0x0000000100000c18 and cpu addr 0xffff880414fb6c18
[  173.712128] radeon 0000:01:00.0: fence driver on ring 7 use gpu addr
0x0000000100000c1c and cpu addr 0xffff880414fb6c1c
[  173.860206] [drm] ring test on 0 succeeded in 2 usecs
[  173.860941] [drm] ring test on 1 succeeded in 1 usecs
[  173.861661] [drm] ring test on 2 succeeded in 1 usecs
[  173.862381] [drm] ring test on 3 succeeded in 1 usecs
[  173.863045] [drm] ring test on 4 succeeded in 3 usecs
[  174.040803] [drm] ring test on 5 succeeded in 2 usecs
[  174.041484] [drm] UVD initialized successfully.
[  174.152209] [drm] ring test on 6 succeeded in 15 usecs
[  174.152884] [drm] ring test on 7 succeeded in 4 usecs
[  174.153545] [drm] VCE initialized successfully.
[  174.154235] f 0#2: signaled from fence_wait
[  174.154923] [drm] ib test on ring 0 succeeded in 0 usecs
[  174.155606] f 1#2: signaled from fence_wait
[  174.156273] [drm] ib test on ring 1 succeeded in 0 usecs
[  174.156960] f 2#2: signaled from fence_wait
[  174.157611] [drm] ib test on ring 2 succeeded in 0 usecs
[  174.158282] f 3#2: signaled from fence_wait
[  174.158959] [drm] ib test on ring 3 succeeded in 0 usecs
[  174.159604] f 4#2: signaled from fence_wait
[  174.160242] [drm] ib test on ring 4 succeeded in 0 usecs
[  174.812851] f 5#4: signaled from fence_wait
[  174.813666] [drm] ib test on ring 5 succeeded
[  175.314798] f 6#4: signaled from fence_wait
[  175.315606] [drm] ib test on ring 6 succeeded
[  175.816796] f 7#4: signaled from fence_wait
[  175.817602] [drm] ib test on ring 7 succeeded
[  175.898550] device: 'vcs4': device_add
[  175.898567] PM: Adding info for No Bus:vcs4
[  175.898612] device: 'vcsa4': device_add
[  175.898621] PM: Adding info for No Bus:vcsa4
[  181.380548] ACPI Error: No handler for Region [EC81] (ffff88041d8d9bd0)
[EmbeddedControl] (20160108/evregion-166)
[  181.380553] ACPI Error: Region EmbeddedControl (ID=3) has no handler
(20160108/exfldio-299)
[  181.380557] ACPI Error: Method parse/execution failed
[\_SB.PCI0.PEG0.PEGP.SGOF] (Node ffff88041d8fca50), AE_NOT_EXIST
(20160108/psparse-542)
[  181.380561] ACPI Error: Method parse/execution failed
[\_SB.PCI0.PEG0.PEGP._OFF] (Node ffff88041d8fce88), AE_NOT_EXIST
(20160108/psparse-542)
[  181.380564] ACPI Error: Method parse/execution failed [\_SB.PCI0.GFX0.ATPX]
(Node ffff88041d9034b0), AE_NOT_EXIST (20160108/psparse-542)
[  181.380569] failed to evaluate ATPX got AE_NOT_EXIST
[  264.565810] i2c i2c-9: master_xfer[0] W, addr=0x50, len=1
[  264.565813] i2c i2c-9: master_xfer[1] R, addr=0x50, len=1

It looks like the Intel driver cannot execute that ATPX method either -
I definitely did specify 'radeon.runpm=0' , so this time it must be
something else invoking it .
Do I need to specify 'intel.runpm=0' ?

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