This bug is awaiting verification that the linux-oem-6.11/6.11.0-1009.9 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-done- noble-linux-oem-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-failed- noble-linux-oem-6.11'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-oem-6.11-v2 verification-needed-noble-linux-oem-6.11 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-6.11 in Ubuntu. https://bugs.launchpad.net/bugs/2088972 Title: DP/MST Bandwidth issue when connect dual 4k@60Hz or 5k@120Hz on a dock Status in HWE Next: New Status in linux-oem-6.11 package in Ubuntu: Invalid Status in linux-oem-6.11 source package in Noble: Fix Committed Bug description: [Impact] 1. Connect the K2 Dock to the Host. Plug in two 4K@60Hz monitors to the dock (including one Thunderbolt monitor connected at the end). The Thunderbolt monitor cannot achieve 4K@60Hz and is limited to 4K@30Hz. 2. Connect the K2 Dock to the SUT and plug in a 5K@120Hz monitor. The refresh rate is limited to 60Hz. [Fix] Applied below series of patch in linux-next fix the issue. f2e2092a979c drm/i915/display: Use joined pipes in dsc helpers for slices, bpp f87bdbd66de4 drm/i915/display: Use joined pipes in intel_mode_valid_max_plane_size d09568137344 drm/i915/display: Use joined pipes in intel_dp_joiner_needs_dsc eb920fbbb4c8 drm/i915/display: Simplify intel_joiner_num_pipes and its usage 26fee9e09be3 drm/i915/display: Check whether platform supports joiner [Test] 1. connect 2 4k@60Hz monitors to the dock and check the refresh rate of both monitor are at 60Hz 2. or connect one 5k@120Hz monitor to the dock and check the refresh rate is at 120Hz [Where problems could occur] The series of patches fix the calculation of the num_joined_pipes, it should provide a more accurate bandwidth value. The worse case could lead to blank screen or downgrade the refresh rate. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2088972/+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
