This is a note to let you know that I've just added the patch titled platform/x86: sony-laptop: Don't turn off 0x153 keyboard backlight during probe to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: platform-x86-sony-laptop-don-t-turn-off-0x153-keyboard-backlight-during-probe.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ad75bd85b1db69c97eefea07b375567821f6ef58 Mon Sep 17 00:00:00 2001 From: Hans de Goede <hdegoede@xxxxxxxxxx> Date: Tue, 13 Dec 2022 13:29:43 +0100 Subject: platform/x86: sony-laptop: Don't turn off 0x153 keyboard backlight during probe From: Hans de Goede <hdegoede@xxxxxxxxxx> commit ad75bd85b1db69c97eefea07b375567821f6ef58 upstream. The 0x153 version of the kbd backlight control SNC handle has no separate address to probe if the backlight is there. This turns the probe call into a set keyboard backlight call with a value of 0 turning off the keyboard backlight. Skip probing when there is no separate probe address to avoid this. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1583752 Fixes: 800f20170dcf ("Keyboard backlight control for some Vaio Fit models") Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Reviewed-by: Mattia Dongili <malattia@xxxxxxxx> Link: https://lore.kernel.org/r/20221213122943.11123-1-hdegoede@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/platform/x86/sony-laptop.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) --- a/drivers/platform/x86/sony-laptop.c +++ b/drivers/platform/x86/sony-laptop.c @@ -1913,14 +1913,21 @@ static int sony_nc_kbd_backlight_setup(s break; } - ret = sony_call_snc_handle(handle, probe_base, &result); - if (ret) - return ret; + /* + * Only probe if there is a separate probe_base, otherwise the probe call + * is equivalent to __sony_nc_kbd_backlight_mode_set(0), resulting in + * the keyboard backlight being turned off. + */ + if (probe_base) { + ret = sony_call_snc_handle(handle, probe_base, &result); + if (ret) + return ret; - if ((handle == 0x0137 && !(result & 0x02)) || - !(result & 0x01)) { - dprintk("no backlight keyboard found\n"); - return 0; + if ((handle == 0x0137 && !(result & 0x02)) || + !(result & 0x01)) { + dprintk("no backlight keyboard found\n"); + return 0; + } } kbdbl_ctl = kzalloc(sizeof(*kbdbl_ctl), GFP_KERNEL); Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are queue-4.19/platform-x86-sony-laptop-don-t-turn-off-0x153-keyboard-backlight-during-probe.patch queue-4.19/platform-x86-mxm-wmi-fix-memleak-in-mxm_wmi_call_mx-.patch queue-4.19/asoc-intel-bytcr_rt5640-add-quirk-for-the-advantech-.patch queue-4.19/rtc-cmos-refactor-code-by-using-the-new-dmi_get_bios.patch queue-4.19/asoc-rt5670-remove-unbalanced-pm_runtime_put.patch