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Bug Power Linux

Linux Kernel Suffering Power Management Regression? 186

An anonymous reader writes "It appears that there's a big power management regression in the Linux kernel for the 2.6.38 and 2.6.39 development releases, including the kernel to ship with Ubuntu 11.04 next week. It's reportedly causing a 10~30% increase in power consumption on many laptop computers."
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Linux Kernel Suffering Power Management Regression?

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  • by asdf7890 ( 1518587 ) on Friday April 22, 2011 @06:34PM (#35910852)
    This is presumably not an intentional regression though, more likely just some new/updated code that is causing the CPU to be more busy when the machine is effectively idle than it was previously. It isn't like someone said "hey, Linus, do you mind if I make the kernel eat more power?"!
  • by h4rr4r ( 612664 ) on Friday April 22, 2011 @06:41PM (#35910900)

    Ever notice it is only Phoronix reporting that?
    When did steam come to linux again?

    Sorry, but I want to see this backed up another source before I just go believing it.

  • Moronix test suite (Score:3, Interesting)

    by Sene ( 1794986 ) on Friday April 22, 2011 @06:57PM (#35911028)
    Would be handy if the suite (or the user) would actually produce graphs with different enough colors to make sense which line is which...
  • by Anonymous Coward on Friday April 22, 2011 @07:05PM (#35911092)

    I'm on .38 on multiple computers and I'm not seeing these issues, perhaps it's a configuration error on their end (assuming they compile the kernel themsleves for testing) or a configuration error on whatever distribution they test with?

  • by Jah-Wren Ryel ( 80510 ) on Friday April 22, 2011 @07:08PM (#35911122)

    Ever notice it is only Phoronix reporting that?

    Do you know of any other organization with a large automated regression testing system for linux kernels? That's not just me being snarky, its a serious question - who else beside phoronix is doing this sort of wide-scale testing on a constant basis?

  • Re:Linux on laptop (Score:2, Interesting)

    by hairyfeet ( 841228 ) <bassbeast1968@gm[ ].com ['ail' in gap]> on Friday April 22, 2011 @11:14PM (#35912394) Journal

    Oh I'm not saying you can't do it, it just seems like a hell of a lot of work for very little gain. Personally I wouldn't wish Windows Vista on my worst enemy (although win 7 is quite nice, as is XP without the crapware) but the problem is unless you are an uber geek laptops are a mess and frankly the odds they'll even get 40% of them running stable is a big question mark.

    Plus this is probably THE absolute WORST time in history to be working on the things, as we are talking a HUGE fundamental shift in the way they are designed is going on right NOW this very second. Within less than a year CPU+GPU will be replaced by APU which means that unless you are running old crap its back to the drawing board. Oh and it'll be even MORE of a PITA, thanks to the APUs containing proprietary code for HDMI so that will all have to be reverse engineered.

    I'm just saying unless someone can bitch slap Linus "Plans? We don't need no steenkin plans! []" Torvalds so he'll stop going Goatse on the kernel things will be hard enough without trying to hit a moving target with a live bumblebee, which is what laptops are in the current state. A wise engineer took one look at the guts of one and said "designed for the dump" and he is right, inside the things are a mess. and as I said you can't even buy by model number and be sure it will work, thanks to them playing chipset roulette with anything and everything.

    I just don't see how some guy in his basement, I don't care if he is frickin Einstein, is supposed to keep up with Torvalds AND all the new chipsets AND all the proprietary firmware AND the hardware roulette AND the constant breakage every time the distro gets a bug up their ass to change something fundamental. If you just wanted to say "if you run it on this it is strictly for hobbyist fun" I'd agree with you, but with so many FOSS evangelists saying "Linux is ready to go!" using it on laptops will just turn more people off.

    So if you can make it go more power to you, but I tried it on four bog standard laptops that came through the shop and frankly i spent more time trying to get the damned hardware to work than I did using the damned things. In the end it was simply easier to reinstall Windows than deal with the BS, and I have a feeling until things settle down on the laptop front like they have on desktop most folks are gonna have the same experience. At least with Windows you have drivers for all the hardware, and no spending hours on forums looking for CLI fixes.

    Oh and FYI you don't actually have to track down drivers anymore, Windows Update takes care of that for you. I've even had it find the funky USB TV Tuner drivers which frankly I never thought I'd see the day. I'm still waiting for Linux to have a "find me a damned driver!" button, like has been in windows for ages. Is it really so much to ask for?

  • by RichiH ( 749257 ) on Saturday April 23, 2011 @03:04AM (#35913154) Homepage

    Phoronix is shit. Pure, grade-A shit. Worthless.

    They have _nothing_ of value to add to anything. Sensationalist crap which is not reported elsewhere, _because it it not an issue_.

    Regressions in the development kernels are part of the process. Even actively trying to avoid Phoronix, I have seen tons of those non-news about some random regression and the breathless follow-up that, lo surprise, they didn't just release but fix the issue. Woooooo!

    Phoronix is shit and it should be blacklisted globally on Slashdot and anywhere else. Stop linking to them, stop commenting on them (other than making others aware of this).

    Rant over.

To avoid criticism, do nothing, say nothing, be nothing. -- Elbert Hubbard