APPLIED[U]: [PATCH v2 0/1][SRU][M] HDMI output with More than one child device for port B in VBT error

Andrea Righi andrea.righi at
Mon Jul 10 07:02:36 UTC 2023

On Wed, Jul 05, 2023 at 03:26:51PM +0800, AceLan Kao wrote:
> From: "Chia-Lin Kao (AceLan)" <acelan.kao at>
> BugLink:
> [Impact]
> The HDMI monitor doesn't work, no events while plug/unplug the cable.
> [Fix]
> From the bug report[1], skip the return works around the issue, so I created
> the DMI quirk to list affected platforms.
> Intel is submitting patches[2][3] to fix the issue, but it requires to
> backport huge drm structure changes, too. As there is no regression
> found with this workaround, it's safer to use the DMI quirk to handle
> this issue.
> 1.
> 2.
> 3.
> The real fix from Intel may not be available in v6.5, so also submit this
> to Mantic kernel to benefit the 6.5-OEM kernel as well.
> [Test]
> Verified by me, FE, and ODM.
> [Where problems could occur]
> I have no idea what might happen, so only make the workaround avaiable on
> the listed platforms. So far, no regressions have been observed with
> plug/unplug, switch modes, reboot, and suspend tests.

Applied to mantic/linux-unstable (with minor context adjustment in


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