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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 2024273
and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Jammy)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2024273
Title:
Fix eDP only displays 3/4 area after switching to mirror mode with
external HDMI 4K monitor
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-6.1 package in Ubuntu:
New
Status in linux source package in Jammy:
Incomplete
Status in linux-oem-6.1 source package in Jammy:
New
Bug description:
[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.
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