Jonathan Brier, just to clarify, regarding the scope of this report of
how periodically (typical time frame specifically???) there is a loss of
backlight control, is this reproducible?
** Summary changed:
- [drm:radeon_acpi_init] *ERROR* Cannot find a backlight controller
+ Periodically loss of b
Tested with the daily-live from March 6, 2015 as well as the
image+updates all booting from a live USB as suggested in comment 4.
The backlight error still appears in dmesg -l err.
The backlight controls work upon boot and I haven't noticed any losses
of control. I haven't tracked down the reprod
Jonathan Brier, could you please test for this via
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?
** Tags removed: needs-full-computer-model
** Tags added: latest-bios-f.18
** Changed in: xorg (Ubuntu)
Importance: Low => Medium
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Model number is: E1R45AV
Model description: HP ENVY 15Z-J100 NOTEBOOK PC
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https://bugs.launchpad.net/bugs/1416186
Title:
[drm:radeon_acpi_init] *ERROR* Cannot find a backlight controlle
Jonathan Brier, thank you for reporting this and helping make Ubuntu
better. Could you please provide the full computer model as noted on the
sticker of the computer itself (not from the Bug Description)?
** Tags added: needs-full-computer-model
** Changed in: xorg (Ubuntu)
Importance: Undecid