[Bug 34220] Detects Load on output and blinks screen every ~30secs - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 34220] Detects Load on output and blinks screen every ~30secs
Date: Tue, 20 Aug 2013 03:06:34 +0000	[thread overview]
Message-ID: <bug-34220-8800-xCWY2cFf2M@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-34220-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=34220

--- Comment #11 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Sounds like the bug here is that nouveau causes the VGA display to blink on/off
when checking whether it is connected. (And, to exacerbate the issue, there's
something polling every 30s to see if the monitor is connected/what modes it
has or something.)

Could someone with an affected monitor try to

cat /sys/class/drm/card0-VGA-0/status

(or whatever card/connector the thing is on)

and see if that action causes the monitor to blink on/off? If not, check
/sys/.../modes and .../edid and .../dpms. I'm guessing at least one of those
will cause the blinking issue.

My understanding of the VGA DDC stuff is that the monitor doesn't even have to
be powered on in order to get at that stuff (I guess power is supplied in the
VGA cable itself), much less have to try to show a picture. Although perhaps
not all monitors comply with that ideal.

BTW, please be sure to test it out with the latest kernel, just in case this
has been fixed.

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