Confirmed - upgrading to the latest bios (2.12) fixes both the
brightness issue and fixes the suspend and resume problem present in
later kernels.
Looks like this can be put to bed.
** Changed in: linux (Ubuntu)
Status: Triaged = Fix Released
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I have been asked to test a kernel patch for this bug but I am
struggling to do so.
I am able to obtain the source to the most recent Ubuntu kernel and
compile it. The patch, however, appears to have been written for a later
kernel version. The 3.13 kernel will not compile after applying it. I
Will
I am indeed using the Radeon driver, however, for clarity, you are not
looking inside the acpi_video0 directory for the other entries but
rather its parent directory. Also it might not be called radeon_bl0 on
your system.
Essentially if you list your /sys/class/backlight directory you will
** Attachment added: acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315834/+attachment/4116624/+files/acpidump.txt
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https://bugs.launchpad.net/bugs/1315834
Title:
No fix yet as such, however, thanks to kernel developer AAron Lu I can
confirm that there is a workaround to manually adjust screen brightness.
Its not overly practical, but you possibly write a script to do it. The
sequence of commands is below. Essentially it involves accessing your
video card
Chris - thanks. I have submitted the report today in the format I
previously attached to the acpi mailing list. I will revert if and when
I hear back.
Many thanks
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Chris
I have prepared my email with the information requested as advised in
the link you provided (see attached).
I have determined that I should sent it to xorg-driver-...@lists.x.org
(being listed as for discussions on ati driver related issues. under
graphics issues). Before I send it, please
Chris
For completeness, I can confirm what Chris has said (i.e. the fglrx
drivers do not solve the problem). My testing shows almost the same
situation as Chris has kindly noted. By way of a summary:
3.15rc5 kernel with fglrx drivers - X won't start
3.13 kernel with fglrx drivers on AC power -
Chris
I can confirm that the bug is still present after loading the kernel
installed by package:
linux-
image-3.15.0-031500rc5-generic_3.15.0-031500rc5.201405091635_amd64.deb
The problem remains identical to the standard Ubuntu kernel (as
described in my initial report). I have not altered the
Chris
I can confirm that the bug exists after having updated my bios (2.08 -
2.10). I have also checked the new bios with the upstream kernel for
completeness.
The problem remains identical to the description given in my initial
report. I have removed the outdated bios tag and set this back to
Joseph
Many thanks for your response. I have installed and tested the bug
against the kernel installed by package:
linux-
image-3.15.0-031500rc4-generic_3.15.0-031500rc4.201405042135_amd64.deb
The problem remains identical to the standard Ubuntu kernel (as
described in my initial report).
I
Public bug reported:
I am unable to adjust the screen brightness on my Acer Aspire V5-122P.
Adjusting brightness in the settings applet has no affect. Adjusting
brightness with the keyboard function keys tuns the screen on and off
seemingly randomly.
I believe this (rightly or wrongly) to be a
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