** Description changed: - This bug is for tracking purpose + [Impact] + On the TGL machines, if the panel is 4k resolution and the i915 driver + is in PSR2 mode, the display will be abnormal randomly and the + keyboard reponse is delayed randomly. + + [Fix] + We reported this issue to Intel and Lenovo shipped a machine to Intel + developer, they reproduced the issue and they provided a workaroud + patch. + + [Test] + Booting the system with patched kernel, open 10+ terminal windows, + move those windows or resize those windows for 10 mins, the display + is good. Open a terminal and press 1, 2, 3 and 4 keys rapidly and + repeatedly, the 1, 2, 3, 4 is showed on the terminal immediately, + there is no delay between pressing and showing. + + + [Where problems could occur] + After applying these patches, the DC3 clock off mode is disabled + unconditionally on the TGL+PSR2 machines, this could introduce + power consumption regression. But we tested the patched kernel on + different TGL lenovo machines, all power_management test cases passed.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1922885 Title: Display abnormal on the TGL+4k panel machines To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1922885/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
