** Merge proposal linked: https://code.launchpad.net/~vicamo/hwe-next/+git/intermediate-kernel/+merge/427596
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.14 in Ubuntu. https://bugs.launchpad.net/bugs/1979267 Title: Fix WD22TB4 suspend and resume, two external monitor can not output Status in HWE Next: New Status in linux package in Ubuntu: Incomplete Status in linux-oem-5.14 package in Ubuntu: Invalid Status in linux-oem-5.17 package in Ubuntu: Invalid Status in linux source package in Focal: Incomplete Status in linux-oem-5.14 source package in Focal: Fix Released Status in linux-oem-5.17 source package in Focal: Invalid Status in linux source package in Jammy: Incomplete Status in linux-oem-5.14 source package in Jammy: Invalid Status in linux-oem-5.17 source package in Jammy: Fix Released Bug description: [Impact] Resume SUT from suspend mode, found external monitors can not output, but display setting can recognize external monitors. [Fix] The WD22TB4 Thunderbolt dock at least will revert its DP_MAX_LINK_RATE from HBR3 to HBR2 after system suspend/resume if the DP_DP13_DPCD_REV registers are not read subsequently also as required. Fix this by reading DP_DP13_DPCD_REV registers as well, matching what is done during connector detection. While at it also fix up the same call in drm_dp_mst_dump_topology(). [Test Case] 1. Connect two 4K external monitor to WD22TB4. 2. Put SUT into suspend mode and wait 30sec 3. Resume SUT from suspend mode, found external monitors can not output. [Where problems could occur] low To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1979267/+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
