In airlied/drm-next:
commit 9292f37e1f5c79400254dca46f83313488093825
Author: Eugeni Dodonov <[email protected]>
Date: Thu Jan 5 09:34:28 2012 -0200
drm: give up on edid retries when i2c bus is not responding
This allows to avoid talking to a non-responding bus repeatedly until we
finally timeout after 15 attempts. We can do this by catching the -ENXIO
error, provided by i2c_algo_bit:bit_doAddress call.
Within the bit_doAddress we already try 3 times to get the edid data, so
if the routine tells us that bus is not responding, it is mostly pointless
to keep re-trying those attempts over and over again until we reach final
number of retries.
This change should fix https://bugs.freedesktop.org/show_bug.cgi?id=41059
and improve overall edid detection timing by 10-30% in most cases, and by
a much larger margin in case of phantom outputs (up to 30x in one worst
case).
Timing results for i915-powered machines for 'time xrandr' command:
Machine 1: from 0.840s to 0.290s
Machine 2: from 0.315s to 0.280s
Machine 3: from +/- 4s to 0.184s
Timing results for HD5770 with 'time xrandr' command:
Machine 4: from 3.210s to 1.060s
Reviewed-by: Chris Wilson <[email protected]>
Reviewed-by: Keith Packard <[email protected]>
Tested-by: Sean Finney <[email protected]>
Tested-by: Soren Hansen <[email protected]>
Tested-by: Hernando Torque <[email protected]>
Tested-by: Mike Lothian <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41059
Signed-off-by: Eugeni Dodonov <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Please test and report if this does not resolve the problem for you. In
some instances we may need to teach the application to use
RRGetScreenResourcesCurrent rather than RRGetScreenResources.
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https://bugs.launchpad.net/bugs/855124
Title:
XRANDR operations very slow unless (phantom) HDMI1 disabled
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