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Bug#895129: linux: Battery not detected on Lamina 2-in-1 tablet

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Hi,

On Sat, Apr 07, 2018 at 01:04:27PM +0200, Marcus Lundblad wrote:
> Source: linux
> Severity: normal
> 
> Dear Maintainer,
> 
> I have a Lamina T-1016B 2-in-1 tablet where the battery is not detected
> (the top bar in GNOME shows only the power icon, like on the desktop machine).
> Checking in /var/log/messages I could see the following (grep:ing on ACPI):
> 
> Apr  6 09:17:21 eridanus kernel: [    5.663167] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 09:17:21 eridanus kernel: [    5.956763] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:20:24 eridanus kernel: [    5.720266] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:20:24 eridanus kernel: [    6.020086] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:23:09 eridanus kernel: [    5.656934] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:23:09 eridanus kernel: [    5.979635] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:25:49 eridanus kernel: [    5.849791] ACPI: AC: found native INT33F4 PMIC, not loading
> Apr  6 08:25:49 eridanus kernel: [    6.150902] ACPI: AC: found native INT33F4 PMIC, not loading
> 
> Checking in the kernel sources, I could see the following:
> In https://github.com/torvalds/linux/blob/master/drivers/acpi/battery.c
> 
> There is a blacklist of ACPI HIDs at line 101:
> 
> /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
> static const char * const acpi_battery_blacklist[] = {
> 	"INT33F4", /* X-Powers AXP288 PMIC */
> };
> 
> Further down there's a section for bailing out on blacklisted HIDs at 1491:
> 
> for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
> 		if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
> 			pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
> 				": found native %s PMIC, not loading\n",
> 				acpi_battery_blacklist[i]);
> 			return;
> }
> 
> In __init acpi_battery_init_async
> 
> I suppose enabling the approriate module(s) would maybe solve this.
> In the make menuconfig I could see the following drivers:
> 
> AXP288_ADC, AXP288_CHARGER, and AXP288_FUEL_GAUGE
> 
> I tried building a custom kernel, but upon booting in panics,
> but it seems to be because the initrams fs is not able to mount, I guess
> the image wasn't properly installed in GRUB, or something like that.
> 
> By the way, the info below shows kernel 4.14, but that's because I ran
> reportbug from my desktop, and haven't rebooted into the newest kernel yet
> I hope this doesn't create a hassle.

Last year the blacklist was introduced for the ACPI battery driver:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/acpi/battery.c?id=dccfae6d4f4c2cfa1fdc3bf55755fcad02184b99

Enabling AXP288_FUEL_GAUGE (and dependencies) should result in
proper battery information. If there are still issues with your
system after enabling the config option, send a mail to the
following addresses:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAINTAINERS?id=dccfae6d4f4c2cfa1fdc3bf55755fcad02184b99#n10012

-- Sebastian

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Bug#895129: linux: Battery not detected on Lamina 2-in-1 tablet Marcus Lundblad <ml@update.uu.se> - 2018-04-07 13:10 +0200
  Bug#895129: linux: Battery not detected on Lamina 2-in-1 tablet Sebastian Reichel <sre@debian.org> - 2018-04-07 17:30 +0200
  Bug#895129: linux: Battery not detected on Lamina 2-in-1 tablet Marcus Lundblad <ml@update.uu.se> - 2018-04-11 22:00 +0200

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