Hawei team just tested and verified this bug on 4.15.0-10-generic kernel on D05 server.
-- 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/1738334 Title: hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add io_mem_pfn callback") Status in Linux: New Status in linux package in Ubuntu: Confirmed Status in linux source package in Artful: Fix Released Bug description: [SRU Justification] [Impact] On Artful and Bionic kernels, X fails to start and a kernel splat is printed. This is cbecause ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is incomplete: the hisilicon hibmc driver does not contain the callback and so the kernel tries to execute code at NULL. [Fix] Bionic: There is a generic fix in 4.16 at c67fa6edc8b11afe22c88a23963170bf5f151acf. It is part of a series that applies this generic fix and does a bunch of cleanups; we can safely just pick up the generic fix. Artful: Rather than a generic fix, I have submitted a very very minimal fix that only touches hibmc. [Regression Potential] Artful: Minimal - fix only touches hibmc driver. Tested on D05 board. Bionic: fix is to generic drm code, but is small and easily reviewable. [Testcase] Install patched kernel, try to start X. If it succeeds, the fix works. If there's a kernel splat, the fix does not work. [Notes] Artful: HiSilicon would really like this fix in Artful in such time so that when the next 16.04 point release ships, the HWE kernel will work with Xorg. Bionic: no extra notes. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1738334/+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
