[Bug 36256] New: Return to tty after leaving X problematic if using multiple cards since 2.6.32

[Bug 36256] New: Return to tty after leaving X problematic if using multiple cards since 2.6.32

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36256

           Summary: Return to tty after leaving X problematic if using
                    multiple cards since 2.6.32
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: connor.behan@gmail.com


Created an attachment (id=45653)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45653)
Dmesg output

This bug affects me on every kernel from 2.6.38 to 2.6.32 inclusive. It is NOT
present in 2.6.31. I have two video cards, my primary card is an r128 and my
secondary card is a radeon. I have X setup to *only use the radeon*. Everything
works perfectly before I startx, but once I start X and then leave it, every
console on the primary r128 driven monitor is unusable. It does not seem to
matter how I leave X. Logging out via xfce, "sudo killall X", Ctrl+Alt+Bksp,
Ctrl+Alt+F1, all of these prevent me from using VTs on the primary monitor.
When I say that these VTs are unusable, I mean that no text on them is ever
shown to update. I can still technically use them by silently typing commands
but I cannot see myself type.

Now there are four different scenarios I've tried and they suggest that this
bug is not caused by KMS:

1. No framebuffer on primary r128, modeset=0 on secondary radeon:

The consoles stay on the primary monitor and once I start X and kill X, all
these consoles are unusable.

2. No framebuffer on primary r128, modeset=1 on secondary radeon making it
/dev/fb0:

As soon as the radeon module gets loaded, the framebuffer on my secondary video
card steals all the consoles so that they show up on the secondary monitor.
Starting X and killing X is then OK for me because the focus returns to
consoles that are on the same video card. Even though this "works" it means my
r128 card that I like to use for consoles is just idling this is obviously not
the optimal solution.

3. Uvesafb on primary r128 making it /dev/fb0, modeset=0 on secondary radeon:

The framebuffer consoles appear on the primary monitor and once I start X and
kill X, all these consoles are unusable.

4. Uvesafb on primary r128 making it /dev/fb0, modeset=1 on secondary radeon
making it /dev/fb1:

I can now freely move ttys between the two framebuffers using the "con2fb"
tool. If I start X and then kill X, I can switch between these consoles with
Alt+Fn and all the ones on /dev/fb1 work while all the ones on /dev/fb0 fail to
update.

I hope I'm explaining this well. Attached is my dmesg. Tell me if you need
anything else.

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[Bug 36256] Return to tty after leaving X problematic if using multiple cards since 2.6.32

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36256

--- Comment #1 from Connor Behan <connor.behan@gmail.com> 2011-04-16 06:42:01 PDT ---
I can make the consoles work if I delete /dev/vga_arbiter before starting X.
This explains why 2.6.32 was the first kernel where I had this problem. Can you
go back to making vga_arb a module so people can solve this properly?

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[Bug 36256] Return to tty after leaving X problematic if using multiple cards since 2.6.32

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=36256

Connor Behan <connor.behan@gmail.com> changed:

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

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