** Description changed: 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://lists.ubuntu.com/archives/kernel- team/2016-January/067683.html - 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. + 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: + 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. + Trident 4D-Wave DX/NX; SiS 7018. - References: linux/mm/Kconfig; linux/mm/Kconfig + References: linux/mm/Kconfig; linux/sound/pci/Kconfig 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/linux/page-flags-layout.h, but that caused a bunch of "shifting by too many bits type errors. Anyway it seems that MAX_NR_ZONES is, at least partially, hard coded to 4 in some array definitions and such. Please do not ask me to do "apport-collect" for this bug report as it is not needed, nor relevant.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1534647 Title: Collateral damage due to kernel configuration change enabling CONFIG_ZONE_DEVICE (Kernel 4.4 amd64) Status in linux package in Ubuntu: New 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://lists.ubuntu.com/archives/kernel- team/2016-January/067683.html 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/pci/Kconfig 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/linux/page-flags-layout.h, but that caused a bunch of "shifting by too many bits type errors. Anyway it seems that MAX_NR_ZONES is, at least partially, hard coded to 4 in some array definitions and such. Please do not ask me to do "apport-collect" for this bug report as it is not needed, nor relevant. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1534647/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
