[Intel-gfx] Intel Pineview 3150 DPMS not working (monitor doesn't power off)

[Brian Hall]

I have a nice little Atom motherboard, the D510MO, with the integrated
Pineview graphics (GMA 3150). Everything works fine, but my LCD monitor
never turns off. "xset dpms force suspend" turns off the screen image, but
the monitor stays in "on mode", and after a few seconds the monitor says
"Cable not connected". LCD turns off just fine with dpms suspend from other
video cards. Console blanking doesn't work either: "setterm -powersave on",
although I didn't test that with other video cards.

Is this a known problem with Intel KMS, or the xf86-video-intel driver? Just
trying to figure out if I need to file a bug report against the kernel or
xorg.

I did find this closed bug but it didn't seem to resolve anything:
https://bugs.freedesktop.org/show_bug.cgi?id=20294

I have installed the latest driver, xf86-video-intel-newest 2.12.0-1, but
that didn't change the DPMS issue. Neither did updating the motherboard
BIOS.

> uname -a
Linux brain 2.6.35-ARCH #1 SMP PREEMPT Mon Aug 2 21:54:18 CEST 2010 x86_64
Intel(R) Atom(TM) CPU D510 @ 1.66GHz GenuineIntel GNU/Linux

xf86-video-intel-newest 2.12.0-1
xorg-server 1.8.1.902-1

I'm using the autodefault xorg config (no /etc/X11/xorg.conf file). DPMS
itself appears to be enabled and thinks it's "working".

# grep -i DPMS /var/log/Xorg.0.log
[    87.339] (II) Loading extension DPMS
[    87.663] (II) intel(0): DPMS capabilities: StandBy Suspend; RGB/Color
Display
[    87.717] (==) intel(0): DPMS enabled

00:02.0 VGA compatible controller: Intel Corporation Pineview Integrated
Graphics Controller (rev 02) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 4f4d
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at f0200000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at 20c0 [size=8]
        Memory at e0000000 (32-bit, prefetchable) [size=256M]
        Memory at f0100000 (32-bit, non-prefetchable) [size=1M]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Kernel driver in use: i915
        Kernel modules: i915
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