Public bug reported:
I own Dell Inspiron M5110 (Q15R). This laptop has no keyboard backlight, but
dell-laptop claims otherwise.
My syslog was getting spammed with "Keyboard brightness level control not
supported" as dell-laptop was trying to get/set backlight values.
In dell-laptop there is kbd_led_present variable, but on my M5110 it's
being set to true:
ret = kbd_init_info();
(...)
if (kbd_token_bits != 0 || ret == 0)
kbd_led_present = true;
kbd_token_bits is 0, but so is ret.
kbd_init_info method is only returning != 0 if kbd_get_info is returning != 0
(Basing on this:
http://linux.dell.com/cgi-bin/cgit.cgi/libsmbios.git/tree/src/bin/smbios-keyboard-ctl#n667)
kbd_get_info method returns only cbRES1 value of following smbios call :
cbClass 4
cbSelect 11
cbArg1 0x0
And it returns 0...
I found that any cbRES of this call is giving me nothing but zeros, as if it
wasn't defined in my BIOS. I have it's newest version for my laptop:
[ 0.000000] SMBIOS 2.7 present.
[ 0.000000] DMI: Dell Inc. Inspiron M5110/0X7W03, BIOS A05 03/22/2012
However, if "cbRES3, byte2 Number of keyboard light brightness levels"
is 0 as well, that should mean backlight is not available, right? I'm
attaching possible fix.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: backlight dell
** Patch added: "Possible fix"
https://bugs.launchpad.net/bugs/1478696/+attachment/4434767/+files/dell-laptop.patch
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https://bugs.launchpad.net/bugs/1478696
Title:
dell-laptop: Incorrect keyboard backlight detection
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