Bug 836819 - does not implement DPMS
does not implement DPMS
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-qxl (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Alon Levy
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-07-01 14:06 EDT by Oliver Henshaw
Modified: 2014-08-04 18:09 EDT (History)
7 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-07-31 14:24:22 EDT
Type: Bug
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Description Oliver Henshaw 2012-07-01 14:06:15 EDT
Description of problem:

qxl does not implement dpms, whereas cirrus does. This triggers https://bugs.kde.org/show_bug.cgi?id=302846


with vnc/cirrus:
$ grep -i dpms /var/log/Xorg.0.log
[ 12.572] (II) Loading extension DPMS
[ 14.142] (==) CIRRUS(0): DPMS enabled

with spice/qxl:
$ grep -i dpms /var/log/Xorg.0.log
[ 12.633] (II) Loading extension DPMS

I've no idea whether dpms is worth implementing or not. I'm sure there must be some power-saving benefits, right?

Version-Release number of selected component (if applicable):

Seen on the F17 Kde Live image, I think that's xorg-x11-drv-qxl-0.0.22-0.fc17
Comment 1 Alon Levy 2012-07-01 14:57:20 EDT
I guess it won't hurt implementing this because of the warning. No power benefits on the host of course. The client machine could possibly be prevented by our client from activating a screensaver, but even if it is so it is independent of the driver. If you know it does please file a bug about it, that would be a power efficiency fix.

Comment 2 Oliver Henshaw 2012-10-03 10:40:18 EDT
re: power benefits I was thinking that e.g. X11 clients on the guest would (IIRC) recieve a VisibilityNotify event when DPMS is activated and could stop unnecesary work. And I remember reading that some hardware graphics drivers throttle their clocks when attached displays are in DPMS state - I don't know if there are opportunities for qxl or the spice display or llvmpipe to conserve resources when DPMS is active?

Plus I would have found working DPMS in a VM useful in my ongoing effort to chase down a string of kde powerdevil bugs.

See also bug 679868.
Comment 3 Fedora End Of Life 2013-07-03 15:37:32 EDT
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