Re: [edk2-devel] [PATCH V2 2/2] MdeModulePkg/GraphicsConsoleDxe: Do not clean the screen

["Sean" <sean.brogan@microsoft.com>]

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There is no reason the devices have to start in mode -1.  A device when started should report an accurate list of modes and if it is already in one of those modes it should report the correct mode.  This way higher level software can choose not to call setmode because it identifies that the device is already set.

This avoids the spec compliance issue in that the SetMode function is still always spec compliant.

Did I miss something for your second patch?

Thanks
Sean



From: Gao, Zhichao <zhichao.gao@intel.com>
Sent: Thursday, April 25, 2019 7:39 PM
To: devel@edk2.groups.io; Sean Brogan <sean.brogan@microsoft.com>; Gao, Liming <liming.gao@intel.com>
Subject: RE: [edk2-devel] [PATCH V2 2/2] MdeModulePkg/GraphicsConsoleDxe: Do not clean the screen

The change you provided is covered in patch #1.
But that can only save one problem:
not to repeat clearing the screen which is already set a console mode while adding console devices.
This is not match the info in 1412<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D1412&data=01%7C01%7Csean.brogan%40microsoft.com%7Cbc7432dac0774fb5d44808d6c9f05101%7C72f988bf86f141af91ab2d7cd011db47%7C1&sdata=SF4ieluLBvC0PcWzY2vvwiTSsDK%2FlGUaSNwd69Aa9Z0%3D&reserved=0>: “This is not a desired behavior when booting a consumer device as it clears the boot logo.”

For the first time, the screens are always cleared because its initial mode is ‘-1’ which is regarding as an invalid mode.

Here is the code covered your change:
https://github.com/ZhichaoGao/edk2/commit/72d5198cb131c456eb250b88a8bd7e6cf2d18b3b<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FZhichaoGao%2Fedk2%2Fcommit%2F72d5198cb131c456eb250b88a8bd7e6cf2d18b3b&data=01%7C01%7Csean.brogan%40microsoft.com%7Cbc7432dac0774fb5d44808d6c9f05101%7C72f988bf86f141af91ab2d7cd011db47%7C1&sdata=7evSbqLIJ5qRAwu3fQRYTtsM0dwVHtM%2BvYbiIFITmYo%3D&reserved=0>
And the blow is the change which can solve the clear screen issue, and this is incorrect based on the discussion in the community:
https://github.com/ZhichaoGao/edk2/commit/8ed0248c74564e2d8be0babca1ef0b49e4147478<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FZhichaoGao%2Fedk2%2Fcommit%2F8ed0248c74564e2d8be0babca1ef0b49e4147478&data=01%7C01%7Csean.brogan%40microsoft.com%7Cbc7432dac0774fb5d44808d6c9f05101%7C72f988bf86f141af91ab2d7cd011db47%7C1&sdata=5eL1ceaPzm5%2FsoEWx4nvVBTpgySEROC2vnj1P0zSlWE%3D&reserved=0>

If I have any mistakes, please correct them.

Thanks,
Zhichao

From: devel@edk2.groups.io<mailto:devel@edk2.groups.io> [mailto:devel@edk2.groups.io] On Behalf Of Sean via Groups.Io
Sent: Friday, April 26, 2019 9:12 AM
To: Gao; Gao, Zhichao <zhichao.gao@intel.com<mailto:zhichao.gao@intel.com>>; devel@edk2.groups.io<mailto:devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH V2 2/2] MdeModulePkg/GraphicsConsoleDxe: Do not clean the screen

Is there a branch where this code change can be reviewed?

The intent of bug 1412 was not to break spec alignment on the uefi defined protocol and SetMode() function.  We had a proposed change that can be seen here. https://github.com/Microsoft/mu_basecore/pull/13/files<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMicrosoft%2Fmu_basecore%2Fpull%2F13%2Ffiles&data=01%7C01%7Csean.brogan%40microsoft.com%7Cbc7432dac0774fb5d44808d6c9f05101%7C72f988bf86f141af91ab2d7cd011db47%7C1&sdata=vWV9wNrRBglVT1T0l1oGv%2BdVLJ0mpbBf9Nlo%2FX6pnWg%3D&reserved=0>
The idea was for new devices published, only clear the screen if the mode needs to change.  Our reading of the UEFI spec didn't define how new devices needed to be added and didn't require the screen be cleared.


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