ACK: [PATCH 0/1][SRU][L/M/U] Fix eDP only displays 3/4 area after switching to mirror mode with external HDMI 4K monitor

[Tim Gardner]

On 7/19/23 7:11 AM, Chris Chiu wrote:
> BugLink: https://bugs.launchpad.net/bugs/2024273
> 
> [Impact]
> Panel on laptops connect to some 4K monitors via HDMI only display 3/4 area on eDP after switching to mirror mode.
> 
> [Fix]
> Backport a fix from Intel on https://cgit.freedesktop.org/drm-tip/commit/?id=a2da67028cd05516343533c1609fcaf037237fed.
> 
> [Test]
> 1. Power on the laptop
> 2. Connect a 4K monitor (4k Benq EL2870U, 4k HP z27Kg3, 2k ASUS PA27AC) to the laptop with HDMI cable.
> 3. Switch to mirror mode from default Joint Mode
> 4. Verify there's no obvious blank space on the leftmost/rightmost side of the laptop's panel.
> 
> [Where problems could occur]
> Only observed after connecting with some particular 4K monitors. It's a generic fix to accept arbitrary refresh rate for more advanced panels. Should be low risk to old machines.
> 
> Ville Syrjälä (1):
>    drm/i915: Allow arbitrary refresh rates with VRR eDP panels
> 
>   drivers/gpu/drm/i915/display/intel_panel.c | 80 ++++++++++++++++++----
>   1 file changed, 66 insertions(+), 14 deletions(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc