[Mesa-dev] [Bug 98502] Delay when starting firefox, thunderbird or chromium and dmesg spam

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98502

--- Comment #14 from Emil Velikov <emil.l.velikov at gmail.com> ---
(In reply to Tobias Droste from comment #12)
> (In reply to Eugene Shalygin from comment #11)
> > I have the same problem: Qt5 wakes up dGPU on launch [1]. However, I believe
> > that this is a kernel problem: the dGPU wakes up when a program tries to
> > read from /sys/bus/pci/devices/<bus id>/config. This was not happening with
> > 4.7 and when I use Arch's current LTS kernel (4.4) it also works fine [2].
> 
> As soon as all the patches landed (from comment #10) there's no need to
> check /sys/bus/pci/devices/<bus id>/config anymore, because there's a new
> API to get that info that doesn't need to wake up the device and the problem
> goes away. But right now the mesa patches are not applied as far as I can
> tell.
> 
Yes and no - yes the patches in comment #10 will help from graphics POV, but no
they won't help with the 'generic case' that Eugene is talking about. With
"generic case" being anyone reading the ./config file will wake up the device.

Eugene if behaviour has changed across kernel versions [i.e. you're confident
that with kernel X the dGPU was powered off and reading ./config did not wake
it up] feel free to bisect and report it.

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