[SRU] Backport xorg-server 1.20.13 to focal
Bug #1947820 reported by
Bin Li
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
AMD |
Fix Released
|
Undecided
|
Unassigned | ||
OEM Priority Project |
Fix Released
|
Critical
|
Bin Li | ||
xorg-server (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Timo Aaltonen |
Bug Description
[Impact]
The delay phenomenon is serious in 'External display mode' during the 'On-demand' mode working.
Please reference lp:1940247 and lp:1919118.
[Fix]
I installed 21.10 on Raptor12(
[Test]
On Raptor12(
[Where problems could occur]
Although the nvidia driver is not released, I thought it's no harm to upgrade xorg-server first.
no longer affects: | linux-firmware (Ubuntu) |
tags: | added: oem-priority originate-from-1919118 sutton |
Changed in oem-priority: | |
assignee: | nobody → Bin Li (binli) |
importance: | Undecided → Critical |
affects: | xorg-server → xorg-server (Ubuntu) |
Changed in xorg-server (Ubuntu): | |
status: | New → Confirmed |
Changed in xorg-server (Ubuntu): | |
status: | New → Invalid |
Changed in xorg-server (Ubuntu Focal): | |
assignee: | nobody → Timo Aaltonen (tjaalton) |
tags: | added: originate-from-1947372 somerville |
tags: | added: originate-from-1948411 |
tags: | removed: originate-from-1947372 originate-from-1948411 somerville |
Changed in oem-priority: | |
status: | Triaged → Fix Released |
Changed in amd: | |
status: | New → Fix Released |
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https:/ /bugs.launchpad .net/nvidia- drivers- ubuntu/ +bug/1940247/ comments/ 15
NV update for NV#3374575: /gitlab. freedesktop. org/xorg/ xserver/ -/issues/ 1028 . https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg-server/ +bug/1875015 .
Hi Kevin - This is an expected issue for all drivers with the currently shipping X server (1.20.9 in the bug report): https:/
The issue is that X Present doesn't support synchronizing to PRIME heads. When the external display (via Reverse PRIME) is the only head left, X Present vsync apps have nothing to sync to and throttle to 1 FPS by default. The only solution right now is to disable vsync, try adding a .sh script in /etc/profile.d with the following contents:
export CLUTTER_VBLANK=none
export vblank_mode=0
That should fix the 1 FPS issue but obviously you won't have vsync. If the system is muxed such that external displays are connected to the iGPU in this configuration, you won't have the problem.