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#1 2019-01-26 11:38:39

thenewcivilian
Member
Registered: 2019-01-26
Posts: 2

T480s - Crucial DDR4 memory stick gets hot while suspended.

I recently bought an new T480s (20L8S02E00-FL) with an crucial (CT16G4SFD824A.C16FHD) 16GB RAM upgrade.
I charged it up to 100%, unplugged it for the first night and when I woke up the next morning the battery had drained to 0%...
After a bit research I figured out, that it seams like the Ram is under full power during suspend mode. It is getting quite hot and loosing around 6% charge every hour.
I now changed the Memory to the default 8GB Lenovo chip, which fixed my problem.
The official crucial Supported Memory (26.1.19) page says: CT16G4SFD824A is supported for the T480s.

My System:
uname -r:

4.20.3-arch1-1-ARCH

dmidecode -t bios

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.0.0 present.

Handle 0x000B, DMI type 0, 24 bytes
BIOS Information
	Vendor: LENOVO
	Version: N22ET49W (1.26 )
	Release Date: 09/13/2018
	Address: 0xE0000
	Runtime Size: 128 kB
	ROM Size: 16 MB
	Characteristics:
		PCI is supported
		PNP is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		EDD is supported
		3.5"/720 kB floppy services are supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		CGA/mono video services are supported (int 10h)
		ACPI is supported
		USB legacy is supported
		BIOS boot specification is supported
		Targeted content distribution is supported
		UEFI is supported
	BIOS Revision: 1.26
	Firmware Revision: 1.9

Handle 0x0023, DMI type 13, 22 bytes
BIOS Language Information
	Language Description Format: Abbreviated
	Installable Languages: 1
		en-US
	Currently Installed Language: en-US

Memory seams to be error free in the checks.

This Problem seams quite similar to: This Post.
But Its not reported for the T480s.
Is there anyone who experienced the same issue?

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#2 2019-01-26 12:48:32

CarbonChauvinist
Member
Registered: 2012-06-16
Posts: 110

Re: T480s - Crucial DDR4 memory stick gets hot while suspended.

Sleep states? S3 vs S0i3?

Check your BIOS and see if there's an option for "Linux"under sleep settings.

For the x1 carbon it's under ~Config -> Power -> Sleep State - Set to “Linux”~ not sure about the t480s.

Last edited by CarbonChauvinist (2019-01-26 12:53:20)


"the wind-blown way, wanna win? don't play"

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#3 2019-01-26 12:56:10

thenewcivilian
Member
Registered: 2019-01-26
Posts: 2

Re: T480s - Crucial DDR4 memory stick gets hot while suspended.

At first I thought this would be the case but turns out there is no S0i3 Sleepmode on the T480s. So no Bios entry.
On Reddit they suspected:

satysin wrote:

I know the T480 and T480s support S3 but I do not think they support S0i3 because part of the Microsoft requirement for Modern Standby is soldered RAM and the T480/T480s have the option for socketed RAM. Maybe if there is no socketed RAM present Windows can use S0i3? I don't know but could be possible I guess.

dmesg | grep -i "acpi: (supports"

[    1.080962] ACPI: (supports S0 S3 S4 S5)

Last edited by thenewcivilian (2019-01-26 12:58:42)

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