This bug was fixed in the package linux-oem - 4.15.0-1059.68
---------------
linux-oem (4.15.0-1059.68) bionic; urgency=medium
* bionic/linux-oem: 4.15.0-1059.68 -proposed tracker (LP: #1847801)
* Fix non-working Realtek USB ethernet after system resume (LP: #1847063)
- r8152: remove extra action copying ethernet address
- r8152: Refresh MAC address during USBDEVFS_RESET
- r8152: Set macpassthru in reset_resume callback
* [CML-U] Comet lake platform need ISH driver support (LP: #1843775)
- HID: intel-ish-hid: Add Comet Lake PCI device ID
* [SRU][OEM-B]UBUNTU: SAUCE: enable adjusting brightness on some samsung OLED
panels (LP: #1844798)
- SAUCE: i915: intel_dp_aux_backlight: Fix max backlight calculations
- SAUCE: drm/i915: customize DPCD brightness control for specific panel
-- Timo Aaltonen <timo.aalto...@canonical.com> Fri, 11 Oct 2019
20:54:45 +0300
** Changed in: linux-oem (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1845584
Title:
intel-lpss driver conflicts with write-combining MTRR region
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Committed
Status in linux-oem source package in Bionic:
Fix Released
Status in linux source package in Disco:
Fix Committed
Status in linux-oem source package in Disco:
Invalid
Status in linux source package in Eoan:
Fix Released
Status in linux-oem source package in Eoan:
Invalid
Status in linux source package in Focal:
In Progress
Status in linux-oem source package in Focal:
Invalid
Bug description:
[Impact]
The memory region intel-lpss-pci uses has been declared as
write-combining
[ 0.001728] 5 base 4000000000 mask 6000000000 write-combining
This leads to the system hangs up during booting up.
This is a BIOS issue, but there are some platforms on the market and
users are struggling on booting up the machines. So, we may have to
fix this in the kernel.
[Fix]
Tuowen Zhao(ztuo...@gmail.com)[1] provides a diff patch for intel-lpss
driver to claim to use un-catchable memory while calling
__devm_ioremap(), and it works well. But it didn't be accepted by
maintainer yet.
To avoid the potential impact on other machines, I add a quirk to list
the machines which has the write-combining area in MTRR which overlaps
with the address that intel-lpss uses, only the machines in the list
pass the DEVM_IOREMAP_UC to __devm_ioremap().
[Test]
Verified on Dell XPS 13 7390 2-in-1
[Regression Potential]
Low, without this patch, the machine even can't boot. And the quirk only for
specific machines, so the modification won't affect other machines.
1. https://bugzilla.kernel.org/show_bug.cgi?id=203485#c23
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