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Re: [Xen-devel] [PATCH 2/2] efi/boot: make sure chosen mode is set even if firmware tell it is


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
  • Date: Fri, 4 Oct 2019 12:33:46 +0100
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  • Delivery-date: Fri, 04 Oct 2019 11:33:58 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 04/10/2019 11:40, Jan Beulich wrote:
> On 03.10.2019 15:49, Igor Druzhinin wrote:
>> If a bootloader is using native driver instead of EFI GOP it might
>> reset graphics mode to be different from what firmware thinks it
>> currently is. Set chosen mode unconditionally to fix this possible
>> misalignment.
>>
>> Observed with EFI GRUB2 compiled with all possible video drivers where
>> native drivers take priority over firmware.
> 
> I don't think this case can happen with just plain EFI. Therefore ...
> 

Could you clarify what you mean by "plain EFI" here? Do you mean being
booted as EFI binary unlike through multiboot protocol? I think in both
cases it's possible to come there through a bootloader.

Igor

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