[Bug 24233] New: Backlight does not power off when using KMS

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Sep 30 13:34:07 PDT 2009


           Summary: Backlight does not power off when using KMS
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: fry.kun at gmail.com
         QAContact: xorg-team at lists.x.org

When I close the laptop lid, the backlight should turn off. I've verified that
xfce4-power-manager (XFCE applet responsible for this) is running and sends the
appropriate command (DPMSForceLevel(GDK_DISPLAY (), DPMSModeOff)) -- but the
backlight stays on.
I've also tried with xset dpms force suspend which didn't do anything either.

As per recommendation from fedora-users list, I tried booting with nomodeset --
and backlight started turning off properly.

Running Fedora 11 with default driver (radeon)

lspci -vvv:

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400
(prog-if 00 [VGA controller])
        Subsystem: Dell Device 2003
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at d0000000 (32-bit, prefetchable) [size=256M]
        Region 1: I/O ports at ee00 [size=256]
        Region 2: Memory at efdf0000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at efd00000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon
        Kernel modules: radeon

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