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Some notebook systems provide the EDID for the internal panel via the _DDC method in ACPI, instead of or in addition to providing the EDID via DDC on LVDS/eDP. Add a DRM helper to search for an ACP _DDC method under the ACPI namespace for each VGA/3D controller, and return the first EDID successfully retrieved via _DDC. Update the i915, nouveau, and radeon DRM-KMS drivers to fall back to

Fall back to retrieving the EDID via the ACPI _DDC method, when present for notebook internal panels, when retrieving BIOS-embedded EDIDs. Signed-off-by: Daniel Dadap <ddadap at nvidia.com> --- drivers/gpu/drm/radeon/radeon_combios.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c index c3e49c973812..de801d9fca54 100644 --- a/drivers/gpu/drm/radeon/radeon_comb...

Am 27.07.20 um 22:53 schrieb Daniel Dadap: > Fall back to retrieving the EDID via the ACPI _DDC method, when present > for notebook internal panels, when retrieving BIOS-embedded EDIDs. > > Signed-off-by: Daniel Dadap <ddadap at nvidia.com> > --- > drivers/gpu/drm/radeon/radeon_combios.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c > index c3e49c973812..de801d9fca54 100644 > ---...

...DDC method. It may be necessary in the future to allow for the retrieval of distinct EDIDs for different output devices, but in order to do so, it will first be necessary to develop a way to correlate individual DRM outputs with their corresponding entities in ACPI. Signed-off-by: Daniel Dadap <ddadap at nvidia.com> --- drivers/gpu/drm/drm_edid.c | 161 +++++++++++++++++++++++++++++++++++++ include/drm/drm_edid.h | 1 + 2 files changed, 162 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 116451101426..f66d6bf048c6 100644 --- a/drivers/gpu/drm/d...

On Mon, Jul 27, 2020 at 03:53:54PM -0500, Daniel Dadap wrote: > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -34,6 +34,7 @@ > #include <linux/module.h> > #include <linux/slab.h> > #include <linux/vga_switcheroo.h> > +#include <linux/pci.h> Nit: Alphabetic ordering. > +static u64 *get_dod_entries(acpi_handle handle,

Thanks, Lukas. I've incorporated your feedback into my local tree, but will wait for additional feedback from the individual DRM driver maintainers before sending out a series v2. On 8/8/20 5:11 PM, Lukas Wunner wrote: > On Mon, Jul 27, 2020 at 03:53:54PM -0500, Daniel Dadap wrote: >> + for (i = 0; i < num_dod_entries; i++) { >> + if (adr ==