[Nouveau] [Bug 34430] New: nouveau driver does not return VGA connector status breaking upower

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34430

           Summary: nouveau driver does not return VGA connector status
                    breaking upower
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: nuada at agh.edu.pl
         QAContact: xorg-team at lists.x.org


My laptop (Asus UL80VT) has hybrid graphics: intel+nvidia. After switching
nvidia card off using vgaswitcheroo, upower CPU consumption goes to 100%. If
nvidia card is switched back on, problem dissapeares.

This is caused by nouveau driver not returning VGA connector status properly.
When upowerd tries to read status of all connectors, it hangs waiting for VGA.

Gentoo Linux
kernel: 2.6.38-rc*
xorg-server: 1.9.4
upower: 0.9.8
KDE: 4.6.0

Steps to reproduce:
1. Log in to KDE
2. switch off nvidia:
    echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
3. cannot read VGA connector status:
    cat
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-VGA-1/status

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