https://bugzilla.kernel.org/show_bug.cgi?id=76971
Bug ID: 76971
Summary: Can't adjust brightness (Toshiba Tecra A50-A-130)
Product: ACPI
Version: 2.5
Kernel Version: 3.13.0
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
(from #72551)
Can't adjust brightness with widget or fn+F6-F7.
acpidump fails:
#acpidump
Cannot map /dev/mem
Could not map table at 0x00000000000F0030 length FEDA0000
Could not get ACPI tables, AE_ACCESS
# ls /sys/class/backlight
acpi_video0 intel_backlight toshiba
This works:
/sys/class/backlight/intel_backlight$ sudo -s
[sudo] password for raphael:
root@alphonse:/sys/devices/pci0000:00/0000:00:02.0/drm/card1/card1-eDP-1/intel_backlight#
echo 700 > brightness
root@alphonse:/sys/devices/pci0000:00/0000:00:02.0/drm/card1/card1-eDP-1/intel_backlight#
echo 1000 > brightness
interesting lines of acpi_listen:
video/brightnessup BRTUP 00000086 00000000 K
video/brightnessdown BRTDN 00000087 00000000 K
tried video.use_native_backlight=1 in boot cmdline, and it works: I can set
backlight in seven step, but auto settings doesn't (when power supply is out,
doesn't diminish etc...)
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