** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1891451
Title:
Add TGL+ SAGV display support
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.6 source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Incomplete
Status in linux-oem-5.6 source package in Groovy:
Invalid
Bug description:
[SRU Justification]
[Impact]
On platforms with UHD panel, massive drawing area updates may cause
screen to flash as half-baked render buffers with black areas being
renedered.
[Fix]
This turns out to be the lack of full support to Intel System Agent
Geyserville (SAGV), which has been landed to kernel v5.8. The required
fix resides in https://patchwork.freedesktop.org/series/75129/, which
seems a rolling set that its early parts have been committed separatedly
several times. This patchset also depends on
https://patchwork.freedesktop.org/series/72301/, which attempts to make
global state handling more standardized.
[Test Case]
1. Trigger massive rect updates, e.g. cat a lengthy file in xterm, dump
kernel git history, etc.
2. Observe if screen flashes with half black panes, sometimes black
stripes, etc.
[Regression Potential]
Medium. This is to backport a new feature landed to kernel early this
year, even there is no later fixes patch found so far, it could still
introduce incompatibility to older kernels. So far it behaves on both
UHD and other lower resolutions.
========== Original Bug Description ==========
On platforms with UHD panel, massive drawing area updates may cause
screen to flash as half-baked render buffers with black areas being
renedered.
[Reproduce Steps]
1. boot to GUI
2. generate massive screen updates by `while true; do dmesg; done` or so
[Results]
Expected Result:
Text output correctly rendered on xterm smoothly
Actual Result:
Screen flashes with black strides, etc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: u 1855 F.... pulseaudio
CasperMD5CheckResult: skip
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-focal-amd64-20200502-85+fossa-bulbasaur+X35
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-08-07 (6 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary
20200502-05:58
IwConfig:
lo no wireless extensions.
enx00e04c6801fa no wireless extensions.
MachineType: Dell Inc. XPS 13 9310
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.6.0-1020-oem
root=UUID=00ec17d2-a1e3-4363-a67b-a7c380cc9189 ro drm.debug=0x1ff
log_buf_len=32M
ProcVersionSignature: Ubuntu 5.6.0-1020.20-oem 5.6.19
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-5.6.0-1020-oem N/A
linux-backports-modules-5.6.0-1020-oem N/A
linux-firmware 1.187.2
RfKill:
Tags: focal
Uname: Linux 5.6.0-1020-oem x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 07/30/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 0.2.9
dmi.board.vendor: Dell Inc.
dmi.chassis.asset.tag: 202007-28063
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr0.2.9:bd07/30/2020:svnDellInc.:pnXPS139310:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9310
dmi.product.sku: 0991
dmi.sys.vendor: Dell Inc.
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