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Thread: Ubuntu Still Figuring Out How To Handle Hybrid Graphics

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  1. #1
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    Default Ubuntu Still Figuring Out How To Handle Hybrid Graphics

    Phoronix: Ubuntu Still Figuring Out How To Handle Hybrid Graphics

    While NVIDIA Optimus and other multi-GPU/hybrid laptop graphics systems have been available for years, in the Linux world support for these capabilities is still in the early stages...

    http://www.phoronix.com/vr.php?view=MTM3MjY

  2. #2
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    Well, if the linux support for hybrid graphics is POOR, what do you want from Canonical?

  3. #3
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    Quote Originally Posted by Alex Sarmiento View Post
    Well, if the linux support for hybrid graphics is POOR, what do you want from Canonical?
    They could contribute this themselves. Obviously, that is not what Canonical usually does, they work more on high level things.

  4. #4
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    Meh, I've always hated hybrid graphics even in windows. My brother has an HP laptop running windows 7 with hybrid AMD/intel graphics and its a horrible buggy mess. whenever looking for linux hardware I always make sure to totally stay away from any hybrid graphics.

  5. #5
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    Quote Originally Posted by bwat47 View Post
    Meh, I've always hated hybrid graphics even in windows. My brother has an HP laptop running windows 7 with hybrid AMD/intel graphics and its a horrible buggy mess. whenever looking for linux hardware I always make sure to totally stay away from any hybrid graphics.
    To be fair, bwat, AMD's implementation of Hybridness is VERY different than Nvidia. Optimus tends to be relatively bug free and very clean on windows 7 at least in my experience with laptops sporting Nvidia+Intel.

    On a separate note, because I know what that someone else would mention it eventually...

    Canonical has to implement Hybrid graphics on their own, in server. Wayland also is currently without Hybrid support but for them its actually better-- remember Wayland just wants buffers filled with pixels. It doesnt care how those pixels got there. Daniel Stone said "Optimus? Thats a client problem." at his linux.conf.au presentation, most likely meaning hybrid support will come down to the Mesa devs leveraging DMA-BUF (everything has to be done in the driver, the kernel, or the GL stack. Wayland just wants buffers.)

    Of interesting note is the actual implementation. On Windows when the hybrid kicks in, things flicker or stutter for a half second whenever you change GPU's and then youre good until you change GPU's again. On OS X interestingly, no stuttering or flickering or even pausing. It was either Daniel or David that said they most likely did all of their hybrid stuff inside their GL layer.

    On Wayland, with compositing being mandatory and with the use of double/triple buffers..I wonder if Wayland will get to the same level of tear-free flicker-free switching. Either solution (Flicker or no flickering) is fine, really, it just looks nicer if we can achieve zero-flicker.

  6. #6
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    Quote Originally Posted by Ericg View Post
    Of interesting note is the actual implementation. On Windows when the hybrid kicks in, things flicker or stutter for a half second whenever you change GPU's and then youre good until you change GPU's again. On OS X interestingly, no stuttering or flickering or even pausing. It was either Daniel or David that said they most likely did all of their hybrid stuff inside their GL layer.
    We've got an NVIDIA Optimus laptop at work and it doesn't flicker or stutter when Optimus kicks in.

  7. #7
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    Nvidia didn't do shit to enable hybrid graphics. They patiently waited for the linaro guys to create dma-buf, then for the X guys to do the X API changes and RANDR imrpovements, then they waltzed in with some comments (when all was done) and made a wrapper around GPL exported symbols. That's history as I remember it...

  8. #8
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    Quote Originally Posted by Serafean View Post
    Nvidia didn't do shit to enable hybrid graphics. They patiently waited for the linaro guys to create dma-buf, then for the X guys to do the X API changes and RANDR imrpovements, then they waltzed in with some comments (when all was done) and made a wrapper around GPL exported symbols. That's history as I remember it...
    Your timeline is accurate, but Nvidia has been quite involved on the mailing lists. Aaron Plattner has been providing lots of advice and code reviews on how to accommodate binary drivers.

    There are many different groups putting work into hybrid graphics. Now it's Canonical's turn. If all goes to plan, Lankhorst's fencing work provide the necessary X infrastructure for tear-free Nvidia blob use of RandR 1.4 in Ubuntu 13.10.

    Once fencing is out of the way, people will move onto multi-monitor situations and power management. Everything is babysteps.

  9. #9
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    Quote Originally Posted by Serafean View Post
    Nvidia didn't do shit to enable hybrid graphics. They patiently waited for the linaro guys to create dma-buf, then for the X guys to do the X API changes and RANDR imrpovements, then they waltzed in with some comments (when all was done) and made a wrapper around GPL exported symbols. That's history as I remember it...
    Better than doing their own proprietary solution that only works for half the use cases. Remember nvidia's "twinview" randr alternative? You want to rotate screens? You need a xorg.conf. You want to rotate only one of two screens? Nope.

    On my notebook PRIME/DMA-Buf works fine with a HD 7970M. Now the only problem is that the radeonsi driver itself doesn't get much love.

  10. #10
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    Default PLEASE someone fix hybrid graphics

    I don't give a damn who the hell creates a good, working hybrid graphics solution. I just to run a laptop with a linux distro and actually use the radeon HD card WITH an up-to-date xorg.
    Also, buttonless touchpads are in desperate need of fixing on linux.

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