Bug 26662
Summary: | Battery voltage not detected on Sony Vaio F | ||
---|---|---|---|
Product: | ACPI | Reporter: | Lukasz Olszewski (lcpak) |
Component: | Power-Battery | Assignee: | acpi_power-battery |
Status: | CLOSED WILL_NOT_FIX | ||
Severity: | normal | CC: | alan, lcpak, lenb, rui.zhang, tianyu.lan |
Priority: | P1 | ||
Hardware: | x86-64 | ||
OS: | Linux | ||
Kernel Version: | 2.6.37-999-generic | Subsystem: | |
Regression: | No | Bisected commit-id: | |
Attachments: |
Some relevant logs
Acpi tables |
please attach the acpidump output of your laptop. is this a regression? does this problem exist in any previous kernel, say 2.6.35? No, it's not a regression. There are though some changes in behavior between kernel versions. For example while using 2.6.35 (one of the latest versions) the gnome-power-manager tool gives some time estimations but they are greatly miscalculated. But speaking of kernel 2.6.37. Here I don't see any time estimations in gnome-power-manager but the acpi tool gave me the following lines: While charging: Battery 0: Charging, 98%, charging at zero rate - will never fully charge. after disconnecting and connecting AC adapter again: Battery 0: Charging, 99%, 00:00:01 until charged (while there is still more than 10 minutes until charged). While discharging: Battery 0: Discharging, 99%, 02:01:52 remaining While fully charged: Battery 0: Full, 100% As you can see acpi shows the estimated time while discharging but it is extremaly jumpy - it can change from 1 hour to 2,5 in matter of 1 second and I think this is what stops gnome-power-manager from displaying a correct value. Created attachment 44022 [details]
Acpi tables
The DSDT fixedly returns 0xFFFFFFFF as "present voltage". This causes the problem. This is the bios issue. Name (BATI, Package (0x0D) { 0x00, 0x2710, 0x2710, 0x00, 0xFFFFFFFF, 0x03E8, 0x01, 0x64, 0x64, "", "", "LiOn", "Sony Corp." }) According to the ACPI spec, _BIF.design_voltage = 0xFFFFFFFF means "unknown design voltage" /proc/acpi/battery/*/info: present: yes design capacity: 57240 mWh last full capacity: 56930 mWh battery technology: non-rechargeable design voltage: 119940 mV design capacity warning: 1000 mWh design capacity low: 1 mWh cycle count: 0 capacity granularity 1: 100 mWh capacity granularity 2: 100 mWh model number: serial number: battery type: LiOn OEM info: Sony Corp. clearly 119940 mV is bogus -- but it also isn't 0xFFFFFFFF. acpi_battery_print_info(struct seq_file *seq, int result) ... if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "design voltage: unknown\n"); else seq_printf(seq, "design voltage: %d mV\n", battery->design_voltage); So we are not getting 0xFFFFFFFF for design_voltage, we are getting something that we think is legal. hi len:
> design voltage: 119940 mV
> clearly 119940 mV is bogus -- but it also isn't 0xFFFFFFFF.
Yeah. The value looks abnormal.
I think the main problems is caused by 'present voltage'.
Name (PKG0, Package (0x04)
{
0x02,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
})
Method (_BST, 0, NotSerialized)
The present voltage is returned as 0xFFFFFFFF.
Tianyu, what's the current status of this bug? This bug is caused by Bios's DSDT.The _BST fixedly returns 0xFFFFFFFF as "present voltage". Well this bug is still present as "present voltage" is still reported as unknown. Tianyu, if this is a BIOS problem, please close it as it can not be fixed. But before that, we'd better confirm that the problem exists in windows as well. |
Created attachment 43522 [details] Some relevant logs The 'present voltage' value in battery/state file is reported as 'unknown' on Sony Vaio F13. This disables proper estimation of battery charge and discharge times in gnome-power-manager.