[Bug 42868] [SNB] DP->DVI dongle causes high mouse pointer latency

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42868


kolAflash <colAflash at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|3.0.0 + 3.1.9 + 3.2.6 +     |3.0.0 + 3.1.9 + 3.2.6 +
                   |                            |3.9.rc8 +




--- Comment #14 from kolAflash <colAflash at gmx.net>  2013-04-26 15:47:37 ---
Thanks for the feedback!

I'm sorry I forgot a little about this bug report, because in the meantime I
just bought another adapter and it's working as good as the one I tried in the
office I'm working (which means no mouse-pointer lag and no change in cpu
usage).

Nevertheless I just did a test with my bad old adapter and the 3.9.rc8 Kernel I
got precompiled from openSUSE:
http://download.opensuse.org/repositories/Kernel:/HEAD/standard/
kernel-default-3.9.rc8-1.1.x86_64.rpm 25-Apr-2013 09:18

Results:
- No mouse pointer lag.
- But cpu usage (2 physical, 4 logical core) raises from about 1% to about 24%
(25% = 1 logical core at 100%) when adapter with monitor attached is being
plugged it. This already happends before I do any changes to my screen setup
(xrandr) to actually get a picture on the second monitor. And the cpu also
stays at that high usage after I used xrandr to turn the second monitor on.

Without a monitor attached to the adapter anything happens at all.


I'll try to think on testing this again when 3.10 is out. If I forget, feel
free to write me an email.

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