I have an HP Spectre x360 Convertible laptop with an Intel 5500U SoC. In short, I am completely unable to boot kernel 4.12-rc3, even though I could boot from 4.12-rc2 perfectly fine. The loading screen does not appear at all, instead GRUB remains stuck on "Loading initial ramdisk ...". Please help. I don't know how to identify what is wrong because I am completely unable to boot the OS to begin with. Needless to say, this is a major problem.
Here is my hardware:
H/W path Device Class Description
====================================================
system HP Spectre x360 Convertible (N5R94UA)
/0 bus 802D
/0/0 memory 64KiB BIOS
/0/10 memory 32KiB L1 cache
/0/11 memory 32KiB L1 cache
/0/12 memory 256KiB L2 cache
/0/13 memory 4MiB L3 cache
/0/14 processor Intel(R) Core(TM) i7-5500U CPU @ 2.40GH
/0/16 memory 8GiB System Memory
/0/16/0 memory 4GiB Row of chips Synchronous 1600 MHz
/0/16/1 memory 4GiB Row of chips Synchronous 1600 MHz
/0/100 bridge Broadwell-U Host Bridge -OPI
/0/100/2 display Broadwell-U Integrated Graphics
/0/100/3 multimedia Broadwell-U Audio Controller
/0/100/14 bus Wildcat Point-LP USB xHCI Controller
/0/100/14/0 usb1 bus xHCI Host Controller
/0/100/14/0/1 input USB Receiver
/0/100/14/0/3 multimedia HP Truevision Full HD
/0/100/14/0/4 input Touchscreen
/0/100/14/0/5 input ITE Device(8350)
/0/100/14/0/7 communication Bluetooth wireless interface
/0/100/14/1 usb2 bus xHCI Host Controller
/0/100/16 communication Wildcat Point-LP MEI Controller #1
/0/100/1c bridge Wildcat Point-LP PCI Express Root Port
/0/100/1c/0 generic RTS5227 PCI Express Card Reader
/0/100/1c.2 bridge Wildcat Point-LP PCI Express Root Port
/0/100/1c.2/0 wlo1 network Wireless 7265
/0/100/1f bridge Wildcat Point-LP LPC Controller
/0/100/1f.2 storage Wildcat Point-LP SATA Controller [AHCI
/0/100/1f.3 bus Wildcat Point-LP SMBus Controller
/0/1 scsi0 storage
/0/1/0.0.0 /dev/sda disk 512GB SAMSUNG MZNTE512
/0/1/0.0.0/1 /dev/sda1 volume 449MiB Windows NTFS volume
/0/1/0.0.0/2 /dev/sda2 volume 99MiB Windows FAT volume
/0/1/0.0.0/3 /dev/sda3 volume 15MiB reserved partition
/0/1/0.0.0/4 /dev/sda4 volume 15EiB Windows FAT volume
/0/1/0.0.0/5 /dev/sda5 volume 838MiB Windows NTFS volume
/0/1/0.0.0/6 /dev/sda6 volume 146GiB Windows NTFS volume
/0/1/0.0.0/7 /dev/sda7 volume 89GiB EXT4 volume
/0/1/0.0.0/8 /dev/sda8 volume 8099MiB Linux swap volume
/1 power PK03056XL
It appears a kernel panic is happening immediately while attempting to boot 4.12-rc3, it doesn't happen on 4.12-rc2.
Adding earlyprintk=efi to the grub command line options, I get the following message (which explains why the bootloader stops at 'loading initial ramdisk...'):
This was meticulously copied from a photo of a GRUB screen, this change is undoubtedly the culprit: https:/
(direct commit at)
https:/
[ 0.000000] Kernel panic - not syncing: x86/PAT: PAT enabled, but not supported by secondary CPU
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.12.0-
[ 0.000000] Hardware name: HP HP Spectre x360 Convertible /802D, BIOS F.45 04/21/2017
[ 0.000000] Call Trace:
[ 0.000000] dump_stack+
[ 0.000000] panic+0xe4/0x22d
[ 0.000000] pat_init+
[ 0.000000] generic_
[ 0.000000] mtrr_bp_
[ 0.000000] setup_arch+
[ 0.000000] ? printk+0x52/0x6e
[ 0.000000] ? early_idt_
[ 0.000000] start_kernel+
[ 0.000000] ? early_idt_
[ 0.000000] x86_64_
[ 0.000000] x86_64_
[ 0.000000] secondary_
[ 0.000000] ---[ end Kernel panic - not syncing: x86/PAT: PAT enabled, but not supported by secondary CPU
[ 0.000000]
This change causes a kernel panic on my Intel 5500U processor, I literally cannot boot my computer. This commit results in a serious regression for multicore Intel CPUs, 4.12-rc3 and drm-tip result in an immediate kernel panic attempting to boot. This is unacceptable.