Hooray! We've managed to hit enough bugs upstream that I've been able to
come up with a pretty solid explanation for how backlight controls are
actually supposed to be detected and used these days. As well, having the
rest of the PWM bits in VESA's backlight interface implemented seems to
have
Now that we've added support to i915 for controlling panel backlights that
need PWM to be enabled/disabled, let's finalize this and add support for
controlling brightness levels via PWM as well. This should hopefully put us
towards the path of supporting _ALL_ backlights via VESA's DPCD interface
As it turns out, apparently some machines will actually leave additional
backlight functionality like dynamic backlight control on before the OS
loads. Currently we don't take care to disable unsupported features when
writing back the backlight mode, which can lead to some rather strange
looking
Since we don't support hybrid AUX/PWM backlights in nouveau right now,
let's add some explicit checks so that we don't break nouveau once we
enable support for these backlights in other drivers.
Signed-off-by: Lyude Paul
---
drivers/gpu/drm/nouveau/nouveau_backlight.c | 5 -
1 file changed,
This simply adds proper support for panel backlights that can be controlled
via VESA's backlight control protocol, but which also require that we
enable and disable the backlight via PWM instead of via the DPCD interface.
We also enable this by default, in order to fix some people's backlights
When I originally moved all of the VESA backlight code in i915 into DRM
helpers, one of the things I didn't have the hardware or time for
testing was machines that used a combination of PWM and DPCD in order to
control their backlights. This has since then caused some breakages and
resulted in us
I think it makes sense to add a Fixes tag to this:
Fixes: 822cab6150d3 ("drm/nouveau/svm: check for SVM initialized
before migrating")
Reviewed-by: Karol Herbst
On Tue, Sep 7, 2021 at 3:20 PM Chenyuan Mi wrote:
>
> The reference counting issue happens in one exception handling path of
>
Reviewed-by: Karol Herbst
sorry for the late response though.
On Fri, Apr 2, 2021 at 12:28 AM Yang Yingliang wrote:
>
> Signed-off-by: Yang Yingliang
> ---
> drivers/gpu/drm/nouveau/nouveau_gem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git
On Sat, 2021-10-02 at 11:14 +0200, Hans de Goede wrote:
> Hi Lyude,
>
> On 10/2/21 12:53 AM, Lyude Paul wrote:
> > When I originally moved all of the VESA backlight code in i915 into DRM
> > helpers, one of the things I didn't have the hardware or time for
> > testing was machines that used a
