URL: <https://savannah.gnu.org/bugs/?67464>
Summary: [Likely Firmware Bug] Grub initialization causes
system hang+reset on older AMD Lenovo laptop unless gfxmode is limited
Group: GNU GRUB
Submitter: ntninja
Submitted: Mi 27 Aug 2025 11:50:31 GMT
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: Hardware-specific
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: other
Release:
Reproducibility: Every Time
Planned Release: None
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Follow-up Comments:
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Date: Mi 27 Aug 2025 11:50:31 GMT By: Erin of Yukis <ntninja>
Affected firmware is (SMBIOS DMI info):
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
Vendor: LENOVO
Version: CECN43WW
Release Date: 09/15/2015
Address: 0xE0000
Runtime Size: 128 kB
ROM Size: 8 MB
Characteristics:
PCI is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
Japanese floppy for NEC 9800 1.2 MB is supported (int 13h)
Japanese floppy for Toshiba 1.2 MB is supported (int 13h)
5.25"/360 kB floppy services are supported (int 13h)
5.25"/1.2 MB floppy services are supported (int 13h)
3.5"/720 kB floppy services are supported (int 13h)
3.5"/2.88 MB floppy services are supported (int 13h)
8042 keyboard services are supported (int 9h)
CGA/mono video services are supported (int 10h)
ACPI is supported
USB legacy is supported
Targeted content distribution is supported
UEFI is supported
BIOS Revision: 1.43
Firmware Revision: 1.43
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: LENOVO
Product Name: 80NY
Version: Lenovo ideapad Y700-15ACZ
Serial Number: ********
UUID: ********
Wake-up Type: Power Switch
SKU Number: LENOVO_MT_80NY_BU_idea_FM_Lenovo ideapad Y700-15ACZ
Family: IDEAPAD
Handle 0x0002, DMI type 2, 16 bytes
Base Board Information
Manufacturer: LENOVO
Product Name: Allsparks 5B
Version: SDK0J40709 WIN
Serial Number: ********
Asset Tag: NO Asset Tag
Features:
Board is a hosting board
Board is replaceable
Location In Chassis: Base Board Chassis Location
Chassis Handle: 0x0003
Type: Motherboard
Contained Object Handles: 0
Setting GRUB_GFXMODE=1024x768 in /etc/default/grub works around the issue. My
guess would be that all VBE supported resolutions work, but UEFI resolutions
exceeding VBE crash the firmware. No sure how many other Lenovo laptops from
the era are affected by this issue – this one is a bit special since its an
“AMD edition”, when almost all others were Intel-only or Intel+NVidia
based (even the “Lenovo ideapad Y700-ISK” uses this more typical
combination), so it might be highly specific to this hardware or broadly
affect Lenovo systems of the time.
I only noticed this issue since Debian no longer limits GFX resolution by
default since Debian 13 (trixie).
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