Fix screen flickering when two 4K 60Hz monitors are connected to AMD Oland GFX
Bug #1928361 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Medium
|
Unassigned | ||
Focal |
Won't Fix
|
Undecided
|
Unassigned | ||
Hirsute |
Fix Released
|
Medium
|
Unassigned | ||
linux-oem-5.10 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Medium
|
Unassigned | ||
Hirsute |
Invalid
|
Undecided
|
Unassigned |
Bug Description
[Impact]
Screen flickers rapidly when two 4K 60Hz monitors are connected to AMD
Oland GFX.
[Fix]
Disable certain power saving feature to keep the performance to output
two 4K 60Hz monitors.
[Test]
Plug two 4K 60Hz and stare at the monitors.
With the patch applied, no more flickers on the screen.
[Where problems could occur]
The GFX clock was restrained for stability on laptops. So if those
laptops have ability to output to dual 4K 60Hz monitors, the systems can
become unstable.
However, Oland is really old chip, those laptops neither have 4K
LVDS, nor have 4K capable HDMI/DP output.
Changed in linux-oem-5.10 (Ubuntu): | |
status: | New → Invalid |
Changed in linux-oem-5.10 (Ubuntu Hirsute): | |
status: | New → Invalid |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
status: | New → Confirmed |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Hirsute): | |
status: | New → Confirmed |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Focal): | |
status: | New → Won't Fix |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
importance: | Undecided → Medium |
tags: | added: oem-priority originate-from-1916426 stella |
tags: | added: originate-from-1921998 |
Changed in linux (Ubuntu Hirsute): | |
status: | Confirmed → Fix Committed |
tags: |
added: verification-done-hirsute removed: verification-needed-hirsute |
tags: |
added: verification-done-focal removed: verification-needed-focal |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
status: | Fix Committed → Fix Released |
Changed in hwe-next: | |
status: | New → Fix Released |
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This bug is awaiting verification that the 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- hirsute' to 'verification- done-hirsute' . If the problem still exists, change the tag 'verification- needed- hirsute' to 'verification- failed- hirsute' .
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!