[Bug 33031] New: r600 DPMS does not turn of backlight

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33031

           Summary: r600 DPMS does not turn of backlight
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: cbandy at jbandy.com


When I issue `setterm -blank force` or `xset dpms force off` the laptop screen
goes blank but the backlight does not turn off.

# lspci -vns 01:00.0
01:00.0 0300: 1002:68c1 (prog-if 00 [VGA controller])
        Subsystem: 103c:1449
        Flags: bus master, fast devsel, latency 0, IRQ 49
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d4000000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at 4000 [size=256]
        Expansion ROM at d4040000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: radeon
        Kernel modules: radeon

In the attached logs,

1. Booted without X
2. Ran # setterm -blank force ; sleep 5 ; setterm -blank poke
3. Started X
4. Ran $ xset dpms force off ; sleep 5 ; xset dpms force on

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