** Description changed: Binary package hint: xserver-xorg-video-intel This issue is a regression from Hardy. I did a clean install of Kubuntu Jaunty RC, using ext4 for partitions. Then I disabled composite effects via xorg.conf and KDE4 settings. The first thing I noticed was that the laptop (Lenovo T61 with Intel GM965 card) was *noticeably* warmer than before, to the point where I can't use it on my lap anymore. I did some measurements using powertop and top to find the guilty process. Top showed the process Xorg taking up 20% of CPU just to redraw the top output. Nothing was open except the konsole window where the testing was done. This is in comparison with 1-2% CPU usage on idle for Hardy. Powertop showed fewer causes for wakeup than before (~100 vs ~180 with KDE3 on Hardy), but the CPU spent more time in higher P-states (14% vs 1%). This is consistent with the Xorg process usage that top showed. Absolute power consumption under battery operation. In hardy (sorry, I don't have the output of powertop on hardy), the power use was 12 W with wireless on, idle, and the dimmest screen brightness. In Jaunty, I'm seeing consumption in excess of 15W under the same conditions. The line "58.5% ( 98.2) <interrupt> : i...@pci:0000:00:02.0" made me think that something was wrong with the latest Intel video drivers. I have also attached my xorg.conf file, which has very little deviance from defaults (most notably EXA acceleration). The output of lspci -vv is also included. In short, I suspect that this problem is due to Intel 2D causing Xorg to do a lot of redraws. Text in particular seems to be slow to process (slow konqueror scrolling). With some research, I also found that framebuffer compression is disabled in the 2.6.3 driver due to a bug. That may have caused an additional spike in power draw. At the time of posting, all packages were the latest in the repositories. The kernel version is 2.6.28-11-generic. + + [lspci] + 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c) + Subsystem: Lenovo Device 20b3 + 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) + Subsystem: Lenovo Device 20b5
-- xserver 1.6.0 - High %CPU/Power Usage with Intel GM965 https://bugs.launchpad.net/bugs/364359 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
