Another Dell AIO backlight issue
Bug #1863880 reported by
AceLan Kao
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Confirmed
|
Undecided
|
Unassigned | ||
Eoan |
Fix Released
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-osp1 (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
[Impact]
The scalar which control the backlight sometimes doesn't respond the first command, so driver can't determinate whether this scalar is in charge of the backlight.
[Fix]
Move the retry block not only to read the response, but also includes write command, so that it re-send the command, too.
[Test]
Verified on the buggy Dell AIO, it passes 30 times and should be more reliable.
[Regression Potential]
Low, there is no code flow change, just move the retry block to include both write and read command.
CVE References
no longer affects: | linux-oem-osp1 (Ubuntu Eoan) |
no longer affects: | linux-oem-osp1 (Ubuntu Focal) |
Changed in linux-oem-osp1 (Ubuntu Bionic): | |
status: | New → Fix Committed |
Changed in linux-oem-osp1 (Ubuntu): | |
status: | New → Invalid |
Changed in linux (Ubuntu Bionic): | |
status: | Incomplete → Fix Committed |
Changed in linux (Ubuntu Eoan): | |
status: | New → Fix Committed |
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This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1863880
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.