Thanks Andrew, For your reply. EDID overriding is the last solution for me. Any way thanks for pointing the EFI_EDID protocols.
> On 19-Sep-2018, at 11:01 PM, Andrew Fish <af...@apple.com> wrote: > > Prabin, > > There is not an easy answer to your question. > 1) What video resolution is available can be a function of what monitor is > plugged in to the graphics card. > 2) The monitor can publish an EDID that defines what resolutions the monitor > supports. EDID is a VESA standard. > 3) An EFI Platform can provide an EFI_EDID_OVERRIDE_PROTOCOL that can impact > the available video modes that get published. > 4) The GOP card will publish EDID information via the > EFI_EDID_DISCOVERED_PROTOCOL. > > As I mentioned the EDID data structure is defined by a VESA standard, but it > also has to be valid for what the monitor can support. Basically you can > override the EDID and tell the GOP card to does something the monitor can not > support. > > Some platforms use the ConSpliter and it produces a virtual GOP protocol that > will aggregate hardware GOPs. So for example if you system has an internal > panel and an external monitor installed you could end up with 2 HW GOP > protocols and a virtual GOP protocol that represents the ConSpliter. > > Thanks, > > Andrew Fish > >> On Sep 15, 2018, at 10:37 PM, prabin ca <prabinc...@gmail.com> wrote: >> >> Any points on this really helpful for me. >> >>> On 15-Sep-2018, at 6:46 AM, prabin ca <prabinc...@gmail.com> wrote: >>> >>> Hi Team, >>> I’m working with a platform having UHD (3840X2160as native resolution) >>> display screen. I have dump the video modes using EFI_GRAPHICS_PROTOCOL. >>> >>> Following are the dump result >>> >>> Mode 0 : hRes = 3840 Vres=2160 >>> Mode 1 : hRes = 640 Vres = 480 >>> Mode 2 : hRes = 800 Vres = 600 >>> Mode 3 : hRes = 1024 Vres = 768 >>> Mode 4 : hRes = 1280 Vres = 1024 >>> Mode 5 : hRes = 1600 Vres = 1200 >>> Mode 6 : hRes = 1920 Vres = 1440 >>> >>> In the supported video mode list, 1920X1080 is not there. Is there any way >>> to add support for this resolution. I have checked UEFI spec but didn’t >>> find any useful API/protocol >>> Any help really appreciate. >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.01.org >> https://lists.01.org/mailman/listinfo/edk2-devel > _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
