[Bug 40851] New: ATI BARTS DPMS: backlight doesn't stay off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40851

           Summary: ATI BARTS DPMS: backlight doesn't stay off
           Product: xorg
           Version: 7.6
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: sebastian_ml at gmx.net
         QAContact: xorg-team at lists.x.org


Hello everybody!

Current setup:
xorg-server-1.10.4
xf86-video-ati-6.14.2
Sapphire HD 6850 BARTS

When DPMS kicks in (no matter what mode, e.g. standby, suspend or off) my
monitor's back-light switches off and then on again. The cycle repeats
endlessly.

Example:

sleep 1; xset dpms force off

Then my monitor goes black and a message appears stating "no input signal".
Then the back-light switches off. But after a second the monitor restarts as if
the status had changed (e.g. signal had returned) and the back-light switches
on again. Next comes the message again "no input signal". Repeat repeat repeat.

I also check if changing the power_method (dynpm vs. profile) makes a
difference, but it doesn't.

I have a HD 3200 on-board. When that card is enabled instead, DPMS works fine.

Thanks for taking a look!

Kind regards
Sebastian

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