Screen flickering if PSR2 selective fetch is enabled

[Kai-Chuan Hsieh]

The issue is similar to lp:2046315

The issue is gone after I config i915.enable_psr2_sel_fetch=0 to kernel cmdline.
Here is the panel edid:

edid-decode (hex):

00 ff ff ff ff ff ff 00 06 af 9c 6d 00 00 00 00
00 1f 01 04 a5 1e 13 78 03 8e 95 a8 54 48 9e 25
0e 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 46 3c 80 a0 70 b0 24 40 2c 20
35 00 2d bc 10 00 00 1a 38 30 80 a0 70 b0 24 40
2c 20 35 00 2d bc 10 00 00 1a 00 00 00 fe 00 32
57 47 59 37 80 42 31 34 30 55 41 4e 00 00 00 00
00 02 41 01 b2 01 11 00 00 0a 01 0a 20 20 01 96

02 03 0f 00 e3 05 80 00 e6 06 05 01 6b 6b 41 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7b

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.4
  Vendor & Product Identification:
    Manufacturer: AUO
    Model: 28060
    Made in: 2021
  Basic Display Parameters & Features:
    Digital display
    Bits per primary color channel: 8
    DisplayPort interface
    Maximum image size: 30 cm x 19 cm
    Gamma: 2.20
    Supported color formats: RGB 4:4:4
    First detailed timing includes the native pixel format and preferred refresh rate
    Display is continuous frequency
  Color Characteristics:
    Red : 0.6582, 0.3281
    Green: 0.2841, 0.6191
    Blue : 0.1464, 0.0556
    White: 0.3134, 0.3291
  Established Timings I & II: none
  Standard Timings: none
  Detailed Timing Descriptors:
    DTD 1: 1920x1200 60.018359 Hz 8:5 74.183 kHz 154.300000 MHz (301 mm x 188 mm)
                 Hfront 44 Hsync 32 Hback 84 Hpol P
                 Vfront 3 Vsync 5 Vback 28 Vpol N
    DTD 2: 1920x1200 48.014688 Hz 8:5 59.346 kHz 123.440000 MHz (301 mm x 188 mm)
                 Hfront 44 Hsync 32 Hback 84 Hpol P
                 Vfront 3 Vsync 5 Vback 28 Vpol N
    Alphanumeric Data String: '2WGY7'
    Manufacturer-Specified Display Descriptor (0x00): 00 00 00 02 41 01 b2 01 11 00 00 0a 01 0a 20 20 '....A......... '
  Extension blocks: 1
Checksum: 0x96

----------------

Block 1, CTA-861 Extension Block:
  Revision: 3
  Native detailed modes: 0
  Colorimetry Data Block:
    BT2020RGB
  HDR Static Metadata Data Block:
    Electro optical transfer functions:
      Traditional gamma - SDR luminance range
      SMPTE ST2084
    Supported static metadata descriptors:
      Static metadata type 1
    Desired content max luminance: 107 (507.620 cd/m^2)
    Desired content max frame-average luminance: 107 (507.620 cd/m^2)
    Desired content min luminance: 65 (0.330 cd/m^2)
Checksum: 0x7b

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-1008.8-oem 6.8.8
Uname: Linux 6.8.0-1008-oem x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckMismatches: ./casper/initrd ./casper/minimal.standard.live.hotfix.squashfs ./casper/minimal.standard.hotfix.squashfs ./casper/minimal.hotfix.squashfs ./boot/grub/grub.cfg
CasperMD5CheckResult: fail
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Jul 19 13:18:33 2024
DistUpgraded: Fresh install
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for Ubuntu 24.04 for Dell
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-noble-oem-24.04a-20240717-43
DistroCodename: noble
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Alder Lake-UP3 GT2 [Iris Xe Graphics] [8086:46a8] (rev 0c) (prog-if 00 [VGA controller])
   Subsystem: Dell Alder Lake-UP3 GT2 [Iris Xe Graphics] [1028:0b11]
InstallationDate: Installed on 2024-07-19 (0 days ago)
InstallationMedia: Ubuntu OEM 24.04 LTS "Noble Numbat" - Release amd64 (20240717)
MachineType: Dell Inc. Latitude 9430
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-1008-oem root=UUID=cac452b0-c80f-44ee-b081-ae24d9ebfa2f ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/22/2023
dmi.bios.release: 1.14
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.14.3
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.14.3:bd05/22/2023:br1.14:svnDellInc.:pnLatitude9430:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:sku0B11:
dmi.product.family: Latitude
dmi.product.name: Latitude 9430
dmi.product.sku: 0B11
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.9-0ubuntu0.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

[Daniel van Vugt (vanvugt)]

See also bug 2073252

[Kai-Chuan Hsieh (kchsieh)]

Tried 6.10-rc4 in https://kernel.ubuntu.com/mainline/v6.10-rc4/. It doesn't help the issue.