ubuntu-x-swat team mailing list archive

[Ali Onur Uyar <653851@xxxxxxxxxxxxxxxxxx>]

In my case it seems like the problem is high interrupt load due to ACPI.
I still do not understand what exactly ACPI has to do with Xorg CPU
Utilization, it is even stranger that an ACPI problem could cause high
CPU utilization for user applications like gedit or thunderbird, but the
fact is that once I added acpi=off to Kernel Boot, the Xorg, gnome-
panel, gedit, thunderbird CPU utilization were scaled to more reasonable
levels and the GUI become much more responsive.

Turning of ACPI disables many important functions like checking the
battery charge level and screen brightness so I ended up following the
Ubuntu ACPI Debugging Document (https://wiki.ubuntu.com/DebuggingACPI)
trying to pinpoint the problem. In the end I was not able to pinpoint
the problem, but I discovered that in my case the pnpacpi=off  boot
option instead of the acpi=off option provided a reasonable solution.
With the pnpacpi=off option critical functions like battery charge level
monitoring and screen brightness contol works without causing
unresponsive GUI.

I am not sure to which package file, what seems to be an ACPI bug.  When
the pnpacpi=off or acpi=off option is not used, one can observe a very
high number of interrupts produced by ACPI in /proc/interrupts crippling
GUI responsiveness. I did some testing with Lucid and Maverick Live CDs
to determine that the problem occurs in clean Lucid and Maverick
installs on Lenovo Ideapad U150, but the impact is more noticable in
Lucid.

-- 
xorg is jerky, uses too much cpu, small display bugs
https://bugs.launchpad.net/bugs/653851
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