Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-osp1 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux-oem-osp1 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: linux-oem-osp1 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1863880
Title:
Another Dell AIO backlight issue
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