[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
*** This bug is a duplicate of bug 818830 *** https://bugs.launchpad.net/bugs/818830 ** Also affects: linux Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
*** This bug is a duplicate of bug 818830 *** https://bugs.launchpad.net/bugs/818830 Hi Steven, I do believe this is a duplicate of bug 818830 so I am marking it as such. I've been in contact with Intel and they are aware of the power regression issue and are actively investigating a fix. They have confirmed that the root cause is the graphics RC6 disablement. The reason RC6 was disabled is because as you've confirmed, there are some critical bugs which are encountered when it is enabled, one of which is the rendering glitches you experience. Going forward, please use bug 818830 regarding further updates to this issue. I will post any additional information I receive to that bug report. Thanks. ** This bug has been marked a duplicate of bug 818830 [Sandy Bridge] serious power regression from kernel 3.0.0-6 to 3.0.0-7 (rc6 disabled) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
I am also experiencing this same issue on a Lenovo X220 i7 2620m. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
I had this problem after I updated first kernel after 2.6.38. So I always kept a copy of 2.6.38. All the 3.0 and even 3.0.1(custom compiled) had this problem. 2.6.38 has graphics glitches, but xorg- edgers has made it usable enough. The 3.0 kernels are good for graphics performance but drains away the power. Since, I have dual graphics card(ATI and one that of sandy bridge), I though problem was because of me having two cards, but it seems all sandy bridge users are having the power regression problem. I had written this post http://ubuntuforums.org/showthread.php?t=1817374. I tried i915.i915_enable_rc6=1 option, it had no effect at all. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Looks like Phoronix has pretty much confirmed this same bug on Sandy Bridge processors: http://www.phoronix.com/scan.php?page=news_itempx=OTg5Mg Their power usage increase between the two kernels matches what I see very closely. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Also seeing this on the new MacBook Air 13.3 Core i5-2557M. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Just passing along what I've experienced with this bug. I also posted this on the duplicate bug (#818830) in case one of them is marked as a duplicate. X220 i7-2620M I experience the difference in power usage w/ 3.x kernels and setting the i915.i915_enable_rc6=1 parameter fixes this issue while bringing back the video corruption. The video corruption for me takes the form of light and dark grey horizontal stripes covering the screen. It always kicks in running on battery, when the screen is waking up from X having it off (due to lid being closed or DPMS turning it off). If I close and reopen the lid again I can see the correct display for a second before the stripes cover it up again. The system is interactive and I can blindly work with the windows. I've found that plugging in my external monitor and using xrandr to enable it fixes the problem. I've been messing around with various xrandr commands to see if I can come up with something that fixes the problem without having the actual physical external monitor plugged in but have had no luck so far. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
** Description changed: I would like to report what myself and several others believe to be a serious bug affecting all Linux kernels 3.0 and up, and none below 3.0 (2.6.x and lower). I tested this using .deb kernel packages for Ubuntu 11.10. One-sentence description: On certain hardware, the 3.x series kernels drain a considerable amount more power than the 2.6-series kernels, up to 40% more, even when idle. The specific hardware I have personally tested is a Lenovo ThinkPad X220 with an Intel SandyBridge i7 2620M processor. We think that this bug is POSSIBLY specific to this processor, or family of processors, commonly used in notebooks. A complete thread of mine and others' results, evidence, and troubleshooting process is located at: http://ubuntuforums.org/showthread.php?t=1822629 We have tried several different 3.0 and 3.1-series kernels, all with the same problems. One part of the problem was that the following (revealed by powertop) was causing excessive processor wakeups compared to the 2.6-series kernels: [Rescheduling interrupts] kernel IPI Someone much more advanced than I figured out how to eliminate this - problem and recompiled the kernel (which he posted in the thread I + problem and recompiled the kernel with no sparse irq, whatever that means (which he posted in the thread I linked to previously), but power usage is still improved only slightly, nowhere near kernel 2.6 levels. There is a lot more information I could give you here, but all of it is contained within the thread I linked to. If you have any specific questions, I will answer as quickly as possible. + + Note, 2011-10-10: This bug seems to have a lot to do with the graphics + of these processors. Adding kernel parameter i915.i915_enable_rc6=1 + significantly improves battery life (even more so with the no sparse irq + kernel...sparse irq seems to be a separate, related problem), but that + kernel parameter brings with it intermittent graphical glitches and + freezes (which are experienced with kernel 2.6.x). Hope that + info/clarification helps. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
This appears to be a potentially related, but apparently different bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818830 The person who posted comment #10 (Eric Liang) on that bug seems to actually be experiencing this bug. He is also using an X220 with a Sandy Bridge processor. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Added package as linux ** Package changed: ubuntu = linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
I made a mistake previously and would like to clear it up. The mistake was a result of not giving something enough time and testing. I have now tested it more thoroughly and have more to report: Using the modified (no sparse irq) kernel with kernel parameter i915.i915_enable_rc6=1 DOES increase battery life compared to without that kernel parameter. The only problem is that it also brings back the graphical glitches and freezes, which were the ONLY reason I wanted to switch to kernel 3.x in the first place. Thus, that kernel parameter in concert with disabling sparse irq in the kernel solves the power problem (completely or almost completely), but the i915.i915_enable_rc6=1 kernel parameter brings back the glitchy graphics from kernel 2.6.x. I have also added this comment to the ubuntuforums thread. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Same issue here on Acer 3820t with Core i3-350m. Kernel rescheduling ticks account for 400-1000 wakeups per second at idle under Bodhi Linux 1.1 (Ubuntu Lucid base) with 3.0.0.7 and 3.0.0.8. Worst I had ever seen previously was around 300-400 per second under 2.6.34.x I think it was. 2.6.38.x usually nets 10-50 or so. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
Forgot to add that my command line arguments have been set by grub to include acpi_osi=Linux i8042.reset=1 for all of the above kernel installs to ensure hardware fn-keys work as intended. Will test with other command line options recommended in this article to see if they have any effect: http://www.phoronix.com/scan.php?page=articleitem=intel_i915_powernum=1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 834037] Re: Huge power regression in kernel 3.x on Sandy Bridge laptops
** Changed in: ubuntu Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
