** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: Po-Hsu Lin (cypressyew)
Status: In Progress
** Changed in: linux (Ubuntu Disco)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Cosmic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1811566
Title:
Backported commit breaks audio (fixed upstream)
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Cosmic:
In Progress
Status in linux source package in Disco:
In Progress
Bug description:
== Justification ==
Commit 648e921888ad96ea3dc922739e96716ad3225d7f (clk: x86: Stop marking
clocks as CLK_IS_CRITICAL) backported to Cosmic kernel fixed the bug that keeps
unused clocks on, but it is breaking the audio support on some Chromebooks
(Swanky / Clapper/ Gnawty) since we were not using
the right clock in the cht_bsw_max98090_ti machine driver.
== Fix ==
a182ecd (ASoC: intel: cht_bsw_max98090_ti: Add quirk for boards
using pmc_plt_clk_0)
984bfb3 (ASoC: intel: cht_bsw_max98090_ti: Add pmc_plt_clk_0 quirk)
94ea56c (ASoC: intel: cht_bsw_max98090_ti: Add pmc_plt_clk_0 quirk)
These 3 patches can be cherry-picked to Cosmic.
== Test ==
Test kernel with these 3 patches could be found in:
http://people.canonical.com/~phlin/kernel/lp-1811566-chromebook-Gnawty/
Bug reporter stated that this kernel can fix the audio issue as
expected.
== Regression potential ==
Low,
changes are limited in the cht_bsw_max98090_ti driver with a new DMI based
quirk table that contains these 3 Chromebook models and some logic to determine
the right clock to use.
It seems that commit 648e921888ad96ea3dc922739e96716ad3225d7f was
backported to ubuntu's 4.18 kernel. That commit breaks audio for some
devices (chromebook gnawty) (from 4.19 on). Now 4.19, 4.20, 5.0 are
fixed, with patch on commit:
47148001ae12292984ba1b38d9babefb9a46cd3e
ASoC: intel: cht_bsw_max98090_ti: Add pmc_plt_clk_0 quirk for Chromebook
Gnawty
Bug reported:
https://bugzilla.kernel.org/show_bug.cgi?id=201787
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