APPLIED: [SRU][R][PATCH 0/1] drm/i915: Restore VESA backlight interface

[Edoardo Canepa]

Applied to R:linux/master-next. Thanks.

On 7/27/26 17:21, Krystian Kaniewski via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2161309
>
> SRU Justification:
>
> [Impact]
>
> Ubuntu kernel 7.0.0-28.28 includes commit 40d2f5820951
> ("drm/i915/backlight: Remove try_vesa_interface").
>
> That change causes an internal display backlight regression on systems
> whose panel advertises VESA AUX backlight support but actually requires
> the Intel/PWM backlight path. Brightness writes complete and the value
> under /sys/class/backlight/intel_backlight changes, but the physical
> screen brightness does not change.
>
> [Fix]
>
> Cherry-pick upstream commit:
>
> f30fddb44023 ("Revert \"drm/i915/backlight: Remove try_vesa_interface\"")
>
> This reverts commit:
>
> 40d2f5820951 ("drm/i915/backlight: Remove try_vesa_interface")
>
> The revert restores the try_vesa_interface gate. This prevents i915
> from selecting the VESA AUX backlight path as an unconditional fallback
> on panels whose VBT indicates that the Intel backlight interface should
> be used.
>
> [Test Case]
>
> Build tested
>
> [Where problems could occur]
>
> The change affects the i915 backlight interface-selection logic for
> internal eDP displays.
>
> A regression could cause brightness control to stop working, select an
> incorrect backlight interface, or restore the wrong brightness level
> after suspend and resume.
>
> The regression potential is considered limited because an equivalent
> change has already been merged and reviewed upstream.
>
> [Other Info]
>
> The upstream revert is present as f30fddb44023. An equivalent
> cherry-pick, 2914709c9141, was included before Linux 7.1-rc7.
>
> Suraj Kandpal (1):
>    Revert "drm/i915/backlight: Remove try_vesa_interface"
>
>   .../drm/i915/display/intel_dp_aux_backlight.c | 19 ++++++++++++-------
>   1 file changed, 12 insertions(+), 7 deletions(-)
>
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