Add TGL+ SAGV display support

[You-Sheng Yang]

[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.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1891451

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[You-Sheng Yang (vicamo)]

PPA: https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1891451

[You-Sheng Yang (vicamo)]

SRU: https://lists.ubuntu.com/archives/kernel-team/2020-August/112675.html

[You-Sheng Yang (vicamo)]

Also verified 5.8 kernel version 5.8.0-16 from ppa:canonical-kernel-team/bootstrap doesn't have this issue, so we may close the Groovy part when it upgrades to 5.8.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

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!

[You-Sheng Yang (vicamo)]

Verified focal-proposed 5.6.0-1022-oem and 5.6.0-1023-oem.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1023.23

---------------
linux-oem-5.6 (5.6.0-1023.23) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1023.23 -proposed tracker (LP: #1892465)

  * CVE-2020-15852
    - x86/ioperm: Fix io bitmap invalidation on Xen PV

  * Fix non-working USB devices plugged during system sleep (LP: #1892678)
    - xhci: Do warm-reset when both CAS and XDEV_RESUME are set

  * ASPM not enabled on child devices behind VMD controller (LP: #1889384)
    - SAUCE: PCI/ASPM: Enable ASPM for links under VMD domain

  * Fix non-working Goodix touchpad after system sleep (LP: #1891998)
    - HID: i2c-hid: Always sleep 60ms after I2C_HID_PWR_ON commands

  * [SRU] Fix acpi backlight issue on some thinkpads (LP: #1892010)
    - platform/x86: thinkpad_acpi: not loading brightness_init when _BCL invalid

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts

 -- Timo Aaltonen <email address hidden> Tue, 25 Aug 2020 08:46:08 +0300

[You-Sheng Yang (vicamo)]

Groovy now has 5.8.0-16.17 in release channel.