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apport-collect 1922885
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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 Hirsute)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1922885
Title:
Display abnormal on the TGL+4k panel machines
Status in HWE Next:
Fix Released
Status in Linux:
Unknown
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.10 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
Incomplete
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Bug description:
[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.
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