Public bug reported: [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. ** Affects: hwe-next Importance: Undecided Status: New ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Affects: linux-oem-6.1 (Ubuntu) Importance: Undecided Status: New ** Affects: linux (Ubuntu Jammy) Importance: Undecided Status: New ** Affects: linux-oem-6.1 (Ubuntu Jammy) Importance: Undecided Status: New ** Tags: oem-priority originate-from-2018460 stella ** Also affects: linux (Ubuntu Jammy) Importance: Undecided Status: New ** Also affects: linux-oem-6.1 (Ubuntu) Importance: Undecided Status: New ** Tags added: oem-priority originate-from-2018460 stella -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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: New Status in linux-oem-6.1 package in Ubuntu: New Status in linux source package in Jammy: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2024273/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
