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Thread: Issues with vgaswitcheroo disappearing?

  1. #11
    Join Date
    Jul 2013
    Posts
    7

    Default Issues with vgaswitcheroo disappearing?

    Same problem here.
    My graphics cards:
    Code:
     lspci | grep VGA
    01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS880M [Mobility Radeon HD 4225/4250]
    02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Park [Mobility Radeon HD 5430/5450/5470]
    kernel 3.11: o.k.
    kernel 3.12: vgaswitcheroo disappears
    kernel 3.13: freeze 10sec after boot( if run something with discrete card, do not freeze)
    like
    Code:
    DRI_PRIME=1 glxgears
    kernel 3.13, DPM disabled:freeze again

  2. #12
    Join Date
    Aug 2012
    Posts
    111

    Default

    Quote Originally Posted by sotos4421 View Post
    kernel 3.13: freeze 10sec after boot( if run something with discrete card, do not freeze)
    like
    Code:
    DRI_PRIME=1 glxgears
    Of course that defeats the purpose of runtime power management, since the reason that it doesn't crash on 3.13 when you're running glxgears on the discrete card is because it's not actually turning off.

  3. #13
    Join Date
    Aug 2012
    Posts
    111

    Default

    I was digging around the kernel.org bugzilla and I came across this bug which may be what we're running into: https://bugzilla.kernel.org/show_bug.cgi?id=61891

  4. #14
    Join Date
    Aug 2012
    Posts
    111

    Default

    If you're running Arch Linux, it seems like the linux-git AUR package builds successfully: https://aur.archlinux.org/packages/linux-git/

    And I've had no crashes, and vgaswitcheroo/switch remains and reports dynamic power in my discrete GPU.

  5. #15
    Join Date
    Mar 2012
    Posts
    66

    Default

    This bug is still present in 3.12.3 and 3.13-rc2 in opensuse. Is there any news related to the bug?

  6. #16
    Join Date
    Dec 2007
    Posts
    2,371

    Default

    The problems are apparently due to a change in the ACPI subsystem:
    http://git.kernel.org/cgit/linux/ker...c98fd5197d9e51
    https://bugzilla.kernel.org/show_bug.cgi?id=61891

  7. #17
    Join Date
    Mar 2012
    Posts
    66

    Default

    Thank you for your fast reply. I saw a couple of bug repots with this commit mentioned.
    Does it mean that vga_switcheroo should be changed in order to work with this commit or the guys from Intel should fix acpi behavior?
    I guess current problem affects all laptop users who tries to save the energy by disabling the discrete card.

  8. #18
    Join Date
    Jul 2013
    Posts
    7

    Default

    With acpiphp.disable=1 in line GRUB_CMDLINE_LINUX_DEFAULT
    all O.K. on my system

  9. #19
    Join Date
    Aug 2012
    Posts
    111

    Default

    Quote Originally Posted by sotos4421 View Post
    With acpiphp.disable=1 in line GRUB_CMDLINE_LINUX_DEFAULT
    all O.K. on my system
    While it does remove errors, there's still an issue that the GPU doesn't actually power down when X is running, as indicated here: https://bugzilla.kernel.org/show_bug.cgi?id=65761

  10. #20
    Join Date
    Sep 2012
    Posts
    88

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