I have the same laptop (Dell Latitude D430) as Bobik-s and am
experiencing what appears to be the same problem with a fresh install of
, so I'll add some more information.
I tried adding the following kernel boot parameters one-by-one:
acpi_backlight=vendor,
acpi_backlight=video
@Bobik-s-
Thanks for the detailed explanation.
Next lets try disabling that dell_backlight interface... Please boot
with the kernel boot parameter dell_laptop.backlight=0, verify that
only intel_backlight appears when you check ls /sys/class/backlight,
and then test the idle-timeout, lid-close,
** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
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https://bugs.launchpad.net/bugs/876711
Title:
Screen brightness resets to minmized when
@Bobik-s, and others experiencing this problem... Thanks for reporting
this issue.
The primary problem here appears to be the same problem as reported in
LP: #872652 (screensaver backlight stuck off, system looks hung), for
which I have developed a test patch. This PPA supplies an installable
Marhaba, Kamal
The problem partially resolved. If the screen goes blank due to the
standby then everything is OK and the backlight restores. But if I close
the lid (w/o suspend or hybernate) then thebrightness resets to minimum
as usual.
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@Bobik-s-
Thanks for posting your result with the PPA. Good that it resolves one
aspect of the problem at least.
Can you describe in more detail the sequence of events you're doing to
get the remaining problem (the brightness resets to minimum) to occur?
When that reset to minimum happens, is
Kamal, here are the answers
sm@D430:~$ ls /sys/class/backlight
dell_backlight intel_backlight
There's no acpi_video0, so I can't try the instruction you've
provided.
The problem with the backlight is the following. The screen of the
laptop I use has different levels of brightness and usually I
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https://bugs.launchpad.net/bugs/876711
Title:
Screen brightness resets to minmized when screen turns off
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xorg (Ubuntu)
Status: New = Confirmed
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