[bug #67464] [Likely Firmware Bug] Grub initialization causes system hang+reset on older AMD Lenovo laptop unless gfxmode is limited

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URL:=0A  <https://savannah.gnu.org/bugs/?67464>=0A=0A                 Summa=
ry: [Likely Firmware Bug] Grub initialization causes=0Asystem hang+reset on=
 older AMD Lenovo laptop unless gfxmode is limited=0A                   Gro=
up: GNU GRUB=0A               Submitter: ntninja=0A               Submitted=
: Mi 27 Aug 2025 11:50:31 GMT=0A                Category: Booting=0A       =
         Severity: Major=0A                Priority: 5 - Normal=0A         =
     Item Group: Hardware-specific=0A                  Status: None=0A     =
            Privacy: Public=0A             Assigned to: None=0A         Ori=
ginator Name:=0A        Originator Email:=0A             Open/Closed: Open=
=0A         Discussion Lock: Any=0A                 Release: other=0A      =
           Release:=0A         Reproducibility: Every Time=0A         Plann=
ed Release: None=0A=0A=0A    ______________________________________________=
_________=0A=0AFollow-up Comments:=0A=0A=0A--------------------------------=
-----------------------=0ADate: Mi 27 Aug 2025 11:50:31 GMT    By: Erin of =
Yukis <ntninja>=0AAffected firmware is (SMBIOS DMI info):=0A=0AHandle 0x000=
0, DMI type 0, 24 bytes=0ABIOS Information=0A   Vendor: LENOVO=0A   Version=
: CECN43WW=0A   Release Date: 09/15/2015=0A   Address: 0xE0000=0A   Runtime=
 Size: 128 kB=0A   ROM Size: 8 MB=0A   Characteristics:=0A      PCI is supp=
orted=0A      BIOS is upgradeable=0A      BIOS shadowing is allowed=0A     =
 Boot from CD is supported=0A      Selectable boot is supported=0A      BIO=
S ROM is socketed=0A      EDD is supported=0A      Japanese floppy for NEC =
9800 1.2 MB is supported (int 13h)=0A      Japanese floppy for Toshiba 1.2 =
MB is supported (int 13h)=0A      5.25"/360 kB floppy services are supporte=
d (int 13h)=0A      5.25"/1.2 MB floppy services are supported (int 13h)=0A=
      3.5"/720 kB floppy services are supported (int 13h)=0A      3.5"/2.88=
 MB floppy services are supported (int 13h)=0A      8042 keyboard services =
are supported (int 9h)=0A      CGA/mono video services are supported (int 1=
0h)=0A      ACPI is supported=0A      USB legacy is supported=0A      Targe=
ted content distribution is supported=0A      UEFI is supported=0A   BIOS R=
evision: 1.43=0A   Firmware Revision: 1.43=0A=0AHandle 0x0001, DMI type 1, =
27 bytes=0ASystem Information=0A        Manufacturer: LENOVO=0A        Prod=
uct Name: 80NY=0A        Version: Lenovo ideapad Y700-15ACZ=0A        Seria=
l Number: ********=0A        UUID: ********=0A        Wake-up Type: Power S=
witch=0A        SKU Number: LENOVO_MT_80NY_BU_idea_FM_Lenovo ideapad Y700-1=
5ACZ=0A        Family: IDEAPAD=0A=0AHandle 0x0002, DMI type 2, 16 bytes=0AB=
ase Board Information=0A        Manufacturer: LENOVO=0A        Product Name=
: Allsparks 5B=0A        Version: SDK0J40709 WIN=0A        Serial Number: *=
*******=0A        Asset Tag: NO Asset Tag=0A        Features:=0A           =
     Board is a hosting board=0A                Board is replaceable=0A    =
    Location In Chassis: Base Board Chassis Location=0A        Chassis Hand=
le: 0x0003=0A        Type: Motherboard=0A        Contained Object Handles: =
0=0A=0A=0ASetting GRUB_GFXMODE=3D1024x768 in /etc/default/grub works around=
 the issue. My=0Aguess would be that all VBE supported resolutions work, bu=
t UEFI resolutions=0Aexceeding VBE crash the firmware. No sure how many oth=
er Lenovo laptops from=0Athe era are affected by this issue =E2=80=93 this =
one is a bit special since its an=0A=E2=80=9CAMD edition=E2=80=9D, when alm=
ost all others were Intel-only or Intel+NVidia=0Abased (even the =E2=80=9CL=
enovo ideapad Y700-ISK=E2=80=9D uses this more typical=0Acombination), so i=
t might be highly specific to this hardware or broadly=0Aaffect Lenovo syst=
ems of the time.=0A=0AI only noticed this issue since Debian no longer limi=
ts GFX resolution by=0Adefault since Debian 13 (trixie).=0A=0A=0A=0A=0A=0A=
=0A=0A    _______________________________________________________=0A=0ARepl=
y to this item at:=0A=0A  <https://savannah.gnu.org/bugs/?67464>=0A=0A_____=
__________________________________________=0ANachricht gesendet =C3=BCber S=
avannah=0Ahttps://savannah.gnu.org/=0A
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