For now most platforms support display function at PEI phase. But the conspliter and graphics console driver would clear the screen at BDS connect console phase. Maybe some platforms would show logo in the next or maybe not. For consumers, it looks like the screen flashed. So change the behavior of graphics console devices while connect console devices to maintain seamless screen from PEI.
Test has done on MinPlatform Kabylake-RVP3 which support PEI display. V2: Make the SetMode not clear the screen only at the first boot during the first conncettion of graphics device. V3: Abandon V2. Directly set the output mode without clear the screen while initialize the graphics console device. Add clear screen operation in stop function of graphics console device. V4: Fix incorrect mode check in V3. Initialize the mode to an invalid mode. If no perfer mode is found, it is better to initialize its text mode to an invalid one. Remove the ClearScreen fuction in the BindingStop function in V3. The graphics output driver may disconnect before graphics console, that may cause a system exception because of using released resource. Impact: the screen would not be cleared after reconnect the graphics device thru software, such as 'reconnect -r' in shell. Cc: Jian J Wang <jian.j.w...@intel.com> Cc: Hao Wu <hao.a...@intel.com> Cc: Ray Ni <ray...@intel.com> Cc: Star Zeng <star.z...@intel.com> Cc: Liming Gao <liming....@intel.com> Cc: Sean Brogan <sean.bro...@microsoft.com> Cc: Michael Turner <michael.tur...@microsoft.com> Cc: Bret Barkelew <bret.barke...@microsoft.com> Cc: Laszlo Ersek <ler...@redhat.com> Aaron Antone (1): MdeModulePkg/ConSplitterDxe: Optimize the ConSplitterTextOutSetMode Zhichao Gao (1): MdeModulePkg/GraphicsConsoleDxe: Initialize the output mode .../Console/ConSplitterDxe/ConSplitter.c | 33 ++++++++++----- .../Console/ConSplitterDxe/ConSplitter.h | 4 +- .../GraphicsConsoleDxe/GraphicsConsole.c | 42 ++++++++++++++----- .../GraphicsConsoleDxe/GraphicsConsoleDxe.inf | 2 + 4 files changed, 59 insertions(+), 22 deletions(-) -- 2.21.0.windows.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#41297): https://edk2.groups.io/g/devel/message/41297 Mute This Topic: https://groups.io/mt/31738399/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
