AMD GPU display is blank when set lower resolution than native mode on eDP

[AaronMa]

[Impact]
AMD GPU display is blank when set lower resolution than native mode on eDP.

[Fix]
On eDP the invalid modes are set, call mode set for valid modes instead.

[Test]
Tested on hardware, all the modes shown in gnome menu can be set OK.

[Where problems could occur]
It may break AMD display.

This issue is not reproduced on v6.2- kernel versions, so SRU for oem-6.5 only.

[Mario Limonciello (superm1)]

The patches for this issue are in the original bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2042867

[AaronMa (mapengyu)]

It's already in mantic and 6.6:

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/mantic/commit/?h=master-next&id=e21d1a38e83ce7f7f8d99c857b941b59c2ddc22f

[Daniel van Vugt (vanvugt)]

Is there a reason why this hasn't been marked as a duplicate of bug 2042867?

[AaronMa (mapengyu)]

Sorry I didn't find bug 2042867

This bug is SRU for oem kernel.
If set duplicated, its status can't be changed.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

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

This bug is awaiting verification that the linux-oem-6.5/6.5.0-1013.14 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-jammy-linux-oem-6.5' to 'verification-done-jammy-linux-oem-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-oem-6.5' to 'verification-failed-jammy-linux-oem-6.5'.

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!

[AaronMa (mapengyu)]

It's merged by Bug #2044174 by stable updates.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-6.5 - 6.5.0-1013.14

---------------
linux-oem-6.5 (6.5.0-1013.14) jammy; urgency=medium

  * jammy/linux-oem-6.5: 6.5.0-1013.14 -proposed tracker (LP: #2049407)

  * Mute/mic LEDs no function on HP ZBook (LP: #2048729)
    - ALSA: hda/realtek: fix mute/micmute LEDs for a HP ZBook

  * iwlwifi leads to system randomly hangs after suspend (LP: #2049184)
    - SAUCE: wifi: iwlwifi: fix a memory corruption

  * Fix BCM57416 lost after resume (LP: #2047518)
    - bnxt_en: Clear resource reservation during resume

  * Mute/mic LEDs and speaker no function on some HP platforms (LP: #2047504)
    - ALSA: hda/realtek: Add quirks for HP Laptops

  * drm: Update file owner during use (LP: #2047461)
    - drm: Update file owner during use

  * Add missing RPL P/U CPU IDs (LP: #2047398)
    - drm/i915/rpl: Update pci ids for RPL P/U

  * Fix AMDGPU crash on 6.5 kernel (LP: #2047389)
    - drm/amdgpu: disable MCBP by default

  * Audio device is not available, instead it shows dummy output in the settings
    (LP: #2047184)
    - ALSA: hda: intel-nhlt: Ignore vbps when looking for DMIC 32 bps format

  * Fix AMDGPU display on lower resolution modes (LP: #2046504)
    - drm/amd/display: fix mode scaling (RMX_.*)
    - drm/amd/display: fix the ability to use lower resolution modes on eDP

  * RTL8852CE WIFI read country list supporting 6 GHz from BIOS (LP: #2045622)
    - wifi: rtw89: Introduce Time Averaged SAR (TAS) feature
    - wifi: rtw89: acpi: process 6 GHz band policy from DSM
    - wifi: rtw89: regd: handle policy of 6 GHz according to BIOS
    - wifi: rtw89: regd: update regulatory map to R65-R44

  [ Ubuntu: 6.5.0-15.15 ]

  * mantic/linux: 6.5.0-15.15 -proposed tracker (LP: #2048549)
  * CVE-2024-0193
    - netfilter: nf_tables: skip set commit for deleted/destroyed sets
  * CVE-2023-6606
    - smb: client: fix OOB in smbCalcSize()
  * CVE-2023-6817
    - netfilter: nft_set_pipapo: skip inactive elements during set walk
  * CVE-2023-6932
    - ipv4: igmp: fix refcnt uaf issue when receiving igmp query packet
  * CVE-2023-6931
    - perf: Fix perf_event_validate_size()
    - perf: Fix perf_event_validate_size() lockdep splat

 -- Timo Aaltonen <email address hidden> Tue, 16 Jan 2024 09:45:28 +0200