Ubuntu
gnome-flashback package

gnome-panel causes flickering with high cpu usage in 14.04.3 trusty

Asked by Lakshminarayanan Seshadri

Setup: Ubuntu 14.04.3 desktop (3.19.0-26-generic) machine with gnome-session flashback installed.
Issue: Whenever one moves pointer near Applications menu i.e Top left corner in gnome panel one sees a flickering in any application window opened at that time as well as high cpu usage in "gnome-panel" process as seen from top.
The issue persists as long as the pointer is near the top left corner in panel at top i.e flickering and high cpu.
Is this a known issue and any WA possible, ?
Thanks in advance

Question information

Language:
English Edit question
Status:
Solved
For:
Ubuntu gnome-flashback Edit question
Assignee:
No assignee Edit question
Solved by:
Lakshminarayanan Seshadri
Solved:
Last query:
Last reply:
Revision history for this message
Lakshminarayanan Seshadri (lnarayanan-seshadri) said : 		#1

The machine is a fresh Ubuntu 14.04.3 trusty install and uses integrated/internal intel graphics card only.

Revision history for this message
Lakshminarayanan Seshadri (lnarayanan-seshadri) said : 		#2

This occurs with gnome Session( metacity) in gnome-panel (top left corner flickering+high cpu of gnome-panel process)

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#3

Does the system have a make and model?

Revision history for this message
Lakshminarayanan Seshadri (lnarayanan-seshadri) said : 		#4

Make : Dell Inspiron 1440 , Intel® Core™2 Duo CPU T6600 @ 2.20GHz × 2 .
Graphics support : Mobile Intel® GM45 Express Chipset .

Revision history for this message
Lakshminarayanan Seshadri (lnarayanan-seshadri) said : 		#5

It appears that gnome-panel provided via gnome-session flashback package on top of Ubuntu 14.04 is not happy with something near applications menu and causes flickering+ spins on a mutex causing high cpu momentarily 10-20%.
I sampled via perf from kernel tools and since i do not know any further on other details, i leave it here.
If anyone who has more info on details of the above package pls look into it.
Not a big issue to worry at moment but annoying to see "gnome-panel" disturbing resource profile of my other work.

thanks in adv.

Revision history for this message
Lakshminarayanan Seshadri (lnarayanan-seshadri) said : 		#6

i opened a bug for same and would update the bug for any updates,