[Bug 83651] New: radeon: kernel returns invalid information about video connectors' status

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83651

            Bug ID: 83651
           Summary: radeon: kernel returns invalid information about video
                    connectors' status
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.1
          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: newgarry at mail.ru
        Regression: No

Information obtained from kernel sys subsystem about ATI HD 5650 card's
connectors status doesn't reflects real existing situation. That prevents
higher level systems using the obtained information from working correctly.

For example, systemd uses that information to decide what to do on lid close
event (related bug report,
https://bugs.freedesktop.org/show_bug.cgi?id=76267#c13).

My laptop have hybrid video configuration (Intel + discrete ATI). The discrete
ATI card is always powered off by init script via vgaswitcheroo interface on
system boot. There aren't external connected monitors.


Following is the valid report from kernel about the Intel card after system
boot:

# cat /sys/class/drm/card0-LVDS-1/status 
connected

# cat /sys/class/drm/card0-VGA-1/status 
disconnected


Following is the invalid report from kernel about the ATI card after system
boot:

# cat /sys/class/drm/card1-LVDS-2/status 
connected

# cat /sys/class/drm/card1-VGA-2/status 
connected

# cat /sys/class/drm/card1-HDMI-A-1/status 
disconnected


Report from vgaswitcheroo interface:

# cat /sys/kernel/debug/vgaswitcheroo/switch 
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0
2:DIS-Audio: :Off:0000:01:00.1


lspci:

# lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated
Graphics Controller (rev 18)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] (rev ff)

# lspci -n | grep 0300
00:02.0 0300: 8086:0046 (rev 18)
01:00.0 0300: 1002:68c1 (rev ff)


Kernel: 3.16.1


Thank you in advance!

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