[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

            Bug ID: 93471
           Summary: [radeonsi] power consumption on pitcairn card stays
                    high after 2. monitor disconnected
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: onlineservices@marwedels.de

Created attachment 120641
  --> https://bugs.freedesktop.org/attachment.cgi?id=120641&action=edit
drm part of dmesg

When starting the PC with a single monitor, the power consumption is about 60W
(was 50-55W with a HD4650 before).

cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 15000 vddc: 900 vddci: 850 pcie gen: 2

When adding a second monitor the power consumption stays at this level until
its get activated.
Once activated (xrandr --output HDMI-0 --auto), the consumption ramps up to
79W.

cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 120000 vddc: 900 vddci: 1000 pcie gen: 2

Disabling the second monitor again (xrandr --output HDMI-0 --off), does not
reduce the consumption again. Not even unplugging helps.
While I read that its simply not possible to get the low power with two active
monitors, could it be possible to manually or
automatically switch to the previous clock if all but one monitor have been
disabled?
Moreover could the signal simply be cloned without consuming +29W if resolution
and refresh rate are equal?
The second monitor is a projector permanently connected, but switched off 90%
of the time.

Xorg: From Debian 8.1 stable
Kernel: 4.3.3
Card (bought as R7 370): VGA compatible controller: Advanced Micro Devices,
Inc. [AMD/ATI] Curacao PRO [Radeon R9 270] (rev 81)

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding Xorg log file.

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #2 from Malte <onlineservices@marwedels.de> ---
Created attachment 120649
  --> https://bugs.freedesktop.org/attachment.cgi?id=120649&action=edit
Xorg.log startup with second monitor attached

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Any chance you could try the current xf86-video-ati release 7.6.1?
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=ddaba449e8d6fe9fc0d97085e4045843fd8d7af9
might help.

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #4 from Malte <onlineservices@marwedels.de> ---
The first try of compiling with the script failed due 32/64bit multiarch. I
will continue after xmas.

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #5 from Malte <onlineservices@marwedels.de> ---
Created attachment 120766
  --> https://bugs.freedesktop.org/attachment.cgi?id=120766&action=edit
Xorg.log startup and xrandr commands executed

I managed to compile and run xorg somehow (got xdm to run, but no default login
or preferred window manager).
Executing xrandr --output HDMI-1 --off a first time properly reduces power,
however the main screen goes blank for a short moment and new console windows
appear in xdm (as if another session would have been restored)
Executing xrandr --output HDMI-1 --auto increases power again. No changes in
xdm
Executing xrandr --output HDMI-1 --off a second time, does nothing. No xdm
changes, no power changes. Exiting and restarting xorg, I can repeat this
procedure with the same result.

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #6 from Malte <onlineservices@marwedels.de> ---
As the mentioned fix is in the ATI driver, it would be good if I actually could
build and use it. Expected it to be in the radeon/radeonsi driver and concluded
the missing xf86-video-ati wont be a problem.

==  Processing:  "driver/xf86-video-ati"
==        configuration options:
make: *** Keine Targets angegeben und keine »make«-Steuerdatei gefunden. 
Schluss.
build.sh: "make " failed on driver/xf86-video-ati



***** Failed components *****
    driver/xf86-video-v4l
    driver/xf86-video-ati
Everything else could be build.

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

--- Comment #7 from Malte <onlineservices@marwedels.de> ---
I used the source from Debian, added the source of the mentioned patch and
build a new .deb packet. Now
xrandr --output HDMI-0 --off
reduces power as expected, thanks for pointing to the patch :)
But the question remains if it is possible to get the lower power consumption
even with two screens (showing the same picture).

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[Bug 93471] [radeonsi] power consumption on pitcairn card stays high after 2. monitor disconnected

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https://bugs.freedesktop.org/show_bug.cgi?id=93471

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
          Component|DRM/Radeon                  |Driver/Radeon
            Version|XOrg git                    |git
         Resolution|---                         |FIXED
           Assignee|dri-devel@lists.freedesktop |xorg-driver-ati@lists.x.org
                   |.org                        |
            Product|DRI                         |xorg
         QA Contact|                            |xorg-team@lists.x.org

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Malte from comment #7)
> I used the source from Debian, added the source of the mentioned patch and
> build a new .deb packet. Now
> xrandr --output HDMI-0 --off
> reduces power as expected, thanks for pointing to the patch :)

No worries, thanks for testing. Resolving this report as fixed.


> But the question remains if it is possible to get the lower power
> consumption even with two screens (showing the same picture).

If both screens are using HDMI connections and the exact same timings, using
the same CRTC for both may work.

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