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Bug 2176

Summary:	TWin randomly overloads CPU when using transparency effects
Product:	TDE	Reporter:	Kristopher <gamrat.kristopher>
Component:	tdebase	Assignee:	Timothy Pearson <kb9vqf>
Status:	RESOLVED FIXED
Severity:	normal	CC:	ac586133, bugwatch, kb9vqf
Priority:	P5
Version:	R14.0.0 [Trinity]
Hardware:	Other
OS:	Linux
Compiler Version:		TDE Version String:
Application Version:		Application Name:
Bug Depends on:
Bug Blocks:	2014

Description Kristopher 2014-10-28 21:51:55 CDT

With the transparency effects enabled for window borders, titlebars, etc. enabled, TWin will randomly start using anywhere from 50% to 100% of my CPUs attention. I've been testing this over the last few days to see if I can determine what is causing this (e.g. moving, resizing, opening/closing, etc.) and I cannot determine one single cause; however, it seems to occur most frequently when adjusting the settings under either Control Center -> Appearance & Themes -> Window Decorations (all tabs) or Control Center -> Desktop -> Window Behavior -> Translucency.

I am running an Intel HD Graphics chip with 256MB video RAM on an Intel Core i7, and I do have X.org's compositor extensions enabled.

Comment 1 Timothy Pearson 2014-10-28 22:05:19 CDT

twin in R14 uses a modified compton as its compositor.  Before R14 final release I'll try to sync the compton code with upstream to see if it fixes this issue.

Comment 2 Alex Couture 2014-11-01 15:07:59 CDT

Hi,

Although it is not exactly the same thing, when TDE R14 is used with Crystal false transparency window border, it causes some lockups of variable length, from 1-2 seconds to half a minute.


-Alexandre

Comment 3 Timothy Pearson 2014-11-01 15:15:34 CDT

(In reply to Alex Couture from comment #2)
> Hi,
> 
> Although it is not exactly the same thing, when TDE R14 is used with Crystal
> false transparency window border, it causes some lockups of variable length,
> from 1-2 seconds to half a minute.
> 
> 
> -Alexandre

I assume you are talking about twin locking up?  If you can break into twin with gdb during those lockups and generate a backtrace that issue could probably be solved.

Tim

Comment 4 Alex Couture 2014-11-02 07:39:49 CST

Ok, please refer to bug 2182

Thank you!
-Alexandre

Comment 5 Timothy Pearson 2014-11-10 16:14:44 CST

Something appears to be calling KIPC BackgroundChanged continually when this bug hits.  If this can be fixed (BackgroundChanged is only supposed to be called when the desktop background changes) the various Crystal transparency bugs should disappear.

Assigning this to myself as I am currently working on it.

Comment 6 Timothy Pearson 2014-11-10 18:33:16 CST

Fixed in GIT hash b0c4ab3.

Thanks for reporting!