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 canonical.com
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 canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/2025195
> 
> [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. https://gitlab.freedesktop.org/drm/intel/-/issues/7709
> 2. https://patchwork.freedesktop.org/series/117641/
> 3. https://patchwork.freedesktop.org/series/114200/
> 
> 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
drivers/gpu/drm/i915/display/intel_display_driver.c).

Thanks,
-Andrea



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