[Bug 34252] New: Unexpected behaviour when switching video cards with vga_switcheroo

[Bug 34252] New: Unexpected behaviour when switching video cards with vga_switcheroo

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=34252

           Summary: Unexpected behaviour when switching video cards with
                    vga_switcheroo
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.39-rc5+ (1be6a1f89f131e9c3d22f819ec542be9cda8c9e3)
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: e-mail@date.by
                CC: alexdeucher@gmail.com
        Regression: Yes


Created an attachment (id=56262)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=56262)
Kernel config

Trying to setup script, that switches video cards, I ran into the situation
when I left with a black screen not possible to do anything with the system.
Here is an example:

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:01:05.0
1:DIS: :Pwr:0000:02:00.0
# echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Off:0000:01:05.0
1:DIS: :Pwr:0000:02:00.0

I think that this behaviour is buggy and this should not happen.

Environment:
# lspci | grep -i vga
01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon
HD 3200 Graphics]
02:00.0 VGA compatible controller: ATI Technologies Inc M93 [Mobility Radeon HD
4500 Series]
# uname -a
Linux garik-laptop 2.6.39-rc5+ #8 SMP Sat Apr 30 18:36:12 MSD 2011 x86_64 AMD
Athlon(tm) Neo Processor MV-40 AuthenticAMD GNU/Linux

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=34252


Andrew Morton <akpm@linux-foundation.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |akpm@linux-foundation.org




--- Comment #1 from Andrew Morton <akpm@linux-foundation.org>  2011-05-02 22:45:36 ---
>From which kernel is this a regression?  2.6.38, I assume?

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252


Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian@mickler.org,
                   |                            |maciej.rutecki@gmail.com,
                   |                            |rjw@sisk.pl
             Blocks|                            |32012




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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #2 from Igor Murzov <e-mail@date.by>  2011-05-02 22:51:51 ---
This is a regression from linux 2.6.37 actually. I had black screen since
2.6.38rc4, I suppose.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252


Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|32012                       |27352




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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #3 from Florian Mickler <florian@mickler.org>  2011-05-09 19:18:48 ---
Do you have a guess, why this is happening (for example, any error messages
from the kernel) ? Can you login via ssh when the system freezes with a black
screen? Do you think the system completely froze, or are, for example, the
sysrq-keys still working? Is there anything in the dmesg that gives a clue? If
there is nothing in the logs, can you try netconsole?

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #4 from Igor Murzov <e-mail@date.by>  2011-05-09 21:53:21 ---
@Florian Mickler:

System is not frozen, only screen is black, because active graphical card gets
turned off. I can log into the system via ssh and turn graphics on.

If I do `echo IGD > /sys/kernel/debug/vgaswitcheroo/switch` just after system
boot, I get following new lines in dmesg:

[ 1230.530299] fbcon: Remapping primary device, fb0, to tty 1-63
[ 1230.570734] radeon: switched off
[ 1230.591094] [drm] Disabling audio support
[ 1230.718090] radeon 0000:01:05.0: PCI INT A disabled

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #5 from Igor Murzov <e-mail@date.by>  2011-05-09 21:56:04 ---
Created an attachment (id=57042)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=57042)
dmesg output

This is a full dmesg output after sending IGD to vgaswitcheroo/switch.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #6 from Florian Mickler <florian@mickler.org>  2011-05-10 13:17:32 ---
Am I understanding correctly that in your opinion the `echo IGD >
/sys/.../switch` should be ignored if already on IGD? I.e. nothing should
happen?

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #7 from Igor Murzov <e-mail@date.by>  2011-05-10 18:08:50 ---
Either ignored, or DIS card should be turned off, not IGD. I don't know what
exactly should happen as there is seems no official docs for vga_switcheroo,
only various tutorials and wikis. For example ubuntu tutorial
(https://help.ubuntu.com/community/HybridGraphics) says:

echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
Connects integrated graphics with outputs.

-- absolutely nothing is said if some card should be turned on / off.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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--- Comment #8 from Florian Mickler <florian@mickler.org>  2011-05-11 06:18:49 ---
Hm.. according to the original commit description  "ON" / "OFF" is used to turn
the not-in-use-card on/off... 

What was the behavior before v2.6.38-rc4? I don't know if this was an intended
change in behavior or an unintended side effect of some other change. Dave
Airlie can probably tell though... 


p.s.: 
Anyway, I presume working around that in userspace is not the issue? (i.e.
maybe doing something like this:

IGDINUSE=`grep IGD /sys/kernel/debug/vgaswitcheroo/switch | awk -F":" '{ $3 }'`
if [ "x$IGDINUSE" != "x+" ]; then
     echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
fi

)

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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https://bugzilla.kernel.org/show_bug.cgi?id=34252





--- Comment #9 from Igor Murzov <e-mail@date.by>  2011-05-11 22:49:30 ---
> What was the behavior before v2.6.38-rc4?

On 2.6.37.6 nothing happens if card is already active:

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:+:Pwr:0000:01:05.0
1: :Pwr:0000:02:00.0
# echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:+:Pwr:0000:01:05.0
1: :Pwr:0000:02:00.0

> Anyway, I presume working around that in userspace is not the issue?

You are right. I wrote simple script for this already. Thanks.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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--- Comment #10 from Florian Mickler <florian@mickler.org>  2011-05-12 14:04:20 ---
Created an attachment (id=57582)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=57582)
Proposed fix

Can you test this patch? I don't have any switcheroo setup, but it makes sense
and compiles.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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--- Comment #11 from Igor Murzov <e-mail@date.by>  2011-05-12 23:01:32 ---
I've tested the patch. It works just fine. It seems that with this patch
vga_switcheroo works the same way as before 2.6.38. Thank you, Florian.

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #12 from Rafael J. Wysocki <rjw@sisk.pl>  2011-05-14 22:19:01 ---
Patch : https://bugzilla.kernel.org/attachment.cgi?id=57582
Handled-By : Florian Mickler <florian@mickler.org>

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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--- Comment #13 from Florian Mickler <florian@mickler.org>  2011-05-19 07:21:09 ---
A patch referencing this bug report has been merged in v2.6.39:

commit a67b8887ced9d54cab7759bdb19deafed37481eb
Author: Florian Mickler <florian@mickler.org>
Date:   Sun May 15 16:32:50 2011 +0200

    vga_switcheroo: don't toggle-switch devices

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[Bug 34252] Unexpected behaviour when switching video cards with vga_switcheroo

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Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED
         Resolution|PATCH_ALREADY_AVAILABLE     |CODE_FIX




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