Hi Dave, On Thu, Mar 10, 2016 at 08:04:26AM +1000, Dave Airlie wrote: > On 10 March 2016 at 00:40, Lukas Wunner <lukas at wunner.de> wrote: > > On Wed, Mar 09, 2016 at 04:14:05PM +1000, Dave Airlie wrote: > >> From: Dave Airlie <airlied at redhat.com> > >> > >> This fixes GPU auto powerdown on the Lenovo W541, > >> since we advertise Windows 2013 to the ACPI layer. > >> > >> Signed-off-by: Dave Airlie <airlied at redhat.com> > >> --- > >> drivers/gpu/drm/nouveau/nouveau_vga.c | 10 +++++++--- > >> 1 file changed, 7 insertions(+), 3 deletions(-) > >> > >> diff --git a/drivers/gpu/drm/nouveau/nouveau_vga.c > >> b/drivers/gpu/drm/nouveau/nouveau_vga.c > >> index af89c36..b987427f 100644 > >> --- a/drivers/gpu/drm/nouveau/nouveau_vga.c > >> +++ b/drivers/gpu/drm/nouveau/nouveau_vga.c > >> @@ -101,8 +101,12 @@ nouveau_vga_init(struct nouveau_drm *drm) > >> runtime = true; > >> vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, > >> runtime); > >> > >> - if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) > >> - vga_switcheroo_init_domain_pm_ops(drm->dev->dev, > >> &drm->vga_pm_domain); > >> + if (runtime) { > >> + if (nouveau_is_v1_dsm() && !nouveau_is_optimus()) > > > > The " && !nouveau_is_optimus()" can be dropped because a machine cannot > > have both. Note the "else" in nouveau_dsm_detect(): > > I'm pretty sure I've seen a machine with both in my past, back in the > Vista/Win7 crossover days.
Yes, but the code in nouveau_dsm_detect() is such that you'll never have both nouveau_is_v1_dsm() and nouveau_is_optimus() return true. So you can drop the " && !nouveau_is_optimus()". Best regards, Lukas > > > You're calling this unconditionally for all Optimus machines yet > > I assume pre Windows 10 machines lack the PR3 hooks. > > > > Yes and I've confirmed on my older machine that nothing bad happens > doing it unconditionally, > and I couldn't find any bits in the _DSM flags to tell me if I should > do something different. > > Dave.