Issue Tracker

10/29/2026

MD 05:28 PM coreboot Bug #670: Lenovo M720q: Incorrect DDI B mapping in VBT prevents DisplayPort detection

Johannes Sjölund wrote in #note-4:
>
> ...
I'd say push a patch with this one then, and try to get a few others to test/validate it as well Matt DeVillier

10/27/2026

MD 10:27 PM coreboot Bug #670: Lenovo M720q: Incorrect DDI B mapping in VBT prevents DisplayPort detection

Thanks for the detailed report and for validating the EFP1 change.
**VBT source**
The in-tree `data.vbt` matches one of the 19 (!!) VBTs from Lenovo’s M1UKT79A image (`m1ujy79usa.exe` / `imageM1U.ROM`) byte-for-byte.
coreboot on... Matt DeVillier

MD 02:38 PM coreboot Bug #670: Lenovo M720q: Incorrect DDI B mapping in VBT prevents DisplayPort detection

The FSP GOP not producing pre-OS output with the modified VBT tells me something is wrong there. Same behavior with the original one? What's the BDB version of the VBT? Matt DeVillier

10/22/2026

MD 02:57 AM coreboot Bug #668: mb/asus/p8x7x-series abuild broken

must have missed that use case when implementing the runtime serial option, https://review.coreboot.org/c/coreboot/+/96589 should resolve it Matt DeVillier

10/15/2026

MD 08:28 PM coreboot Bug #666: EDK2: MrChromebox uefipayload_2608 broken: uefipayload_2511 works on Lenovo X220

Patrick Rudolph wrote in #note-10:
> Updated GRUB to grub2-common-2.12-32.fc42.noarch, the issue still persists.
I pulled the PR into uefipayload_2608 branch, give that a try. It fixed an issue with Batocera that some others had repo... Matt DeVillier

MD 02:59 AM coreboot Bug #666: EDK2: MrChromebox uefipayload_2608 broken: uefipayload_2511 works on Lenovo X220

Sebastian Müller wrote in #note-7:
> I think 2608 is missing the workaround that prevents CpuDxe from publishing
> ...
no, the Memory Attribute Protocol workaround was intentionally dropped in uefipayload_2608. It was only needed for old... Matt DeVillier

MD 06:16 PM coreboot Bug #665: Does EDK2 MrChromeBox support integrated dGPU uga/gop VBIOS file from CBFS?

Walter Sonius wrote in #note-7:
> Earlier test of this were done on the MacbookPro which probably missed the NVIDIA efi GOP part from that extracted ROM, so letting coreboot insert a legacy VBIOS into CBFS and hoping EDK2 will load it d... Matt DeVillier

MD 05:13 PM coreboot Bug #665: Does EDK2 MrChromeBox support integrated dGPU uga/gop VBIOS file from CBFS?

edk2 has the option to execute on-device option ROMs - does that not work for this case? Matt DeVillier

10/14/2026

MD 02:25 PM coreboot Bug #666: EDK2: MrChromebox uefipayload_2608 broken: uefipayload_2511 works on Lenovo X220

Patrick Rudolph wrote in #note-4:
> Attached a log.
> ...
this appears to be a bug with older grub versions, jumping to memory that the payload was not able to allocate instead of requesting a new range. Older edk2 branches papered ove... Matt DeVillier

10/10/2026

MD 02:08 PM coreboot Bug #666: EDK2: MrChromebox uefipayload_2608 broken: uefipayload_2511 works on Lenovo X220

Patrick Rudolph wrote:
> tested with coreboot 717c0505b1063da72db9aba2f1f0e1ef6dee60da
> ...
HEAD of current edk2 branch (1f9ab463057c53883245d0ce5dfe07201efb1efe) or latest tag (26.09.2, afe0e87d25d5ac57191aa7c5211c83d1c13d198f)?
L... Matt DeVillier