Bug 21439 - Powertop reports lots of i815 interrupts; when switching to console and back to X they are gone
Summary: Powertop reports lots of i815 interrupts; when switching to console and back ...
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: 7.4 (2008.09)
Hardware: Other All
: medium normal
Assignee: Jesse Barnes
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords: NEEDINFO
Depends on:
Blocks:
 
Reported: 2009-04-27 12:09 UTC by Dominik Schnitzer
Modified: 2009-08-10 08:48 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
Xorg log; many powertop i915 interrupts (28.67 KB, application/octet-stream)
2009-04-28 09:14 UTC, Dominik Schnitzer 		no flags Details
Xorg log; no i915 interrupts (32.66 KB, application/octet-stream)
2009-04-28 09:15 UTC, Dominik Schnitzer 		no flags Details
dmesg (no more messages reported when switching) (38.58 KB, application/octet-stream)
2009-04-28 09:16 UTC, Dominik Schnitzer 		no flags Details
View All

Description Dominik Schnitzer 2009-04-27 12:09:46 UTC 
I'm using the 2.6.3 intel video driver coming with Ubuntu Jaunty (9.04). My system (Shuttle X27D barebone) is using a "Intel Corporation 82945G/GZ Integrated Graphics Controller".

The intel video driver causes about 20 interrups a second when using the first X session after I boot my system and login to Gnome using GDM.

If I temporarily switch to a system text console (i.e. CRTl-ALT-F1) and then back to X (CTRL-ALT-F7) the interrupts are gone and the system saves 20 wakeups a second :-).

Maybe this points towards some initialization bug.

I hope that helps && thanks for this nice X driver!
Comment 1 Gordon Jin 2009-04-28 01:29:39 UTC 
Please attach Xorg.0.log and dmesg.
Comment 2 Dominik Schnitzer 2009-04-28 09:14:17 UTC 
Created attachment 25234 [details]
Xorg log; many powertop i915 interrupts

This is the xorg.log with many powertop reported interrupts (right after booting)
Comment 3 Dominik Schnitzer 2009-04-28 09:15:30 UTC 
Created attachment 25235 [details]
Xorg log; no i915 interrupts

This is the xorg log after a short switch to the text console and back to X (no i915 interrupts reported in powertop)
Comment 4 Dominik Schnitzer 2009-04-28 09:16:40 UTC 
Created attachment 25236 [details]
dmesg (no more messages reported when switching)
Comment 5 Eric Anholt 2009-05-26 17:02:21 UTC 
Interrupts are generated as a result of normal operation of the GPU.  Are any applications doing rendering?  To verify, start a bare X Server by just running Xorg, and see if you're getting interrupts.
Comment 6 Dominik Schnitzer 2009-05-28 07:44:09 UTC 
The additional interrupts are gone if I switch to the console and back to X11.

They are also gone if I stop the X-Server, and start it again. 

The additional interrupts stay if I use the first X11 session after booting.
Comment 7 Jesse Barnes 2009-07-08 13:56:54 UTC 
Are you still seeing this?
Comment 8 Dominik Schnitzer 2009-08-08 08:30:16 UTC 
the described problem does not occur with the latest 2.8 drivers (in ubuntu karmic)

greetings-
Comment 9 Jesse Barnes 2009-08-10 08:48:18 UTC 
Ok, thanks for the update.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.