Collateral damage due to kernel configuration change enabling CONFIG_ZONE_DEVICE (Kernel 4.4 amd64)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Medium
|
Tim Gardner | ||
Xenial |
Fix Released
|
Medium
|
Tim Gardner | ||
mudita24 (Ubuntu) |
Fix Released
|
Undecided
|
Niels Mayer | ||
Xenial |
Fix Released
|
Undecided
|
Niels Mayer |
Bug Description
Late in the kernel 4.4 RC (Release Candidate) cycle (between rc7 and rc8), Ubuntu implemented an amd64 kernel configuration change enabling CONFIG_ZONE_DEVICE.
The related email: https:/
The commit message does mention collateral damage: "In effect, this precludes devices that can only DMA from memory addresses below 16MB".
Indeed we already have a complaint about a sound card that doesn't work as of kernel 4.4-rc8.
If CONFIG_ZONE_DEVICE is enabled, then CONFIG_ZONE_DMA is forced to disabled, which in turn forces these devices, all are sound cards, and their derivative devices, to be disabled:
Avance Logic ALS300/ALS300+
ALi M5451 PCI Audio Controller
Aztech AZF3328 / PCI168
Emu10k1 (SB Live!, Audigy, E-mu APS)
Emu10k1X (Dell OEM Version)
ESS ES1938/1946/1969 (Solo-1)
ESS ES1968/1978 (Maestro-1/2/2E)
ICEnsemble ICE1712 (Envy24)
ESS Allegro/Maestro3
S3 SonicVibes
Trident 4D-Wave DX/NX; SiS 7018.
References: linux/mm/Kconfig; linux/sound/
One test done (suggested by apw on IRC) was to remove the dependency of ZONE_DEVICE on !ZONE_DMA, but that causes:
"#error ZONES_SHIFT -- too many zones configured adjust calculation", as apw predicted.
In a mindless way, I tried to allow more zones in linux/include/
Please do not ask me to do "apport-collect" for this bug report as it is not needed, nor relevant.
description: | updated |
tags: | added: bot-stop-nagging kernel-da-key |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Xenial): | |
status: | In Progress → Fix Committed |
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1534647
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.