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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Artful)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1698700
Title:
hibmc driver does not include "pci:" prefix in bus ID
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Zesty:
Fix Released
Status in linux source package in Artful:
Incomplete
Bug description:
SRU Justification
[Impact]
On the HiSilicon D05 (arm64) board, X crashes when started. [0]
[Fix]
The crash is attributable to the bus ID that the hibmc driver reports for the
hibmc graphics card on the board. In particular, the bus id is missing the
"pci:" prefix that most other cards provide: [1]
- The busid reported on the arm64 system is "0007:a1:00.0"
- The busid reported on a amd64 system is "pci:0000:00:02.0"
X tests for this prefix. A missing prefix for PCI cards leads to an
Xorg crash.
Fix this by using the set_pci_busid function from the DRM core.
[Testcase]
Successfully tested on a D05 board. [2]
[Regression Potential]
Changes are limited to the hibmc driver, so any regression should also be
limited to that driver.
[Notes]
I submitted the patch upstream. However, upstream is refactoring the drm
core, and set_busid is going away. That does fix this issue but the regression
potential of the refactor is enormous, so this seems like the wiser approach.
[3]
[0]: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1691991
[1]: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1691991/comments/16
[2]: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1691991/comments/29
[3]: https://www.spinics.net/lists/dri-devel/msg143831.html
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