It is good to update to "Fred" (Xin Wei) off-line and thank you very much for it.
On Tue, Jan 23, 2018 at 8:46 AM, Daniel Axtens <daniel.axt...@canonical.com> wrote: > I have talked to the kernel team about this and updated Fred off-line. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1738334 > > Title: > hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add > io_mem_pfn callback") > > Status in linux package in Ubuntu: > Confirmed > > Bug description: > [SRU Justification] > > [Impact] > On Artful 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] > There is a discussion and potential fix at > https://lists.freedesktop.org/archives/dri-devel/2017-November/159002.html > The fix hasn't landed yet and it looks like they're going to re-engineer > the entire section instead. > > Rather than wait for that and deal with the massive regression > potential, the fix I have picked to submit is very very minimal and > touches only hibmc. > > [Regression Potential] > Minimal - fix only touches hibmc driver. Tested on D05 board. > > [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] > HiSilicon would really like this fix in Artful in such time so that when > the next 16.04 point release ships in February, the HWE kernel will work > with Xorg. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/ > 1738334/+subscriptions > -- Zhanglei Mao Solutions Architect, Sales and Business Development Canonical Group Ltd. zhanglei....@canonical.com +86-13625010929 (m) +852-6700 6026 (m) www.ubuntu.com www.canonical.com -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1738334 Title: hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add io_mem_pfn callback") To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1738334/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
