From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 118401] Lenovo A740 gave up waiting for root device with
kernels >= 4.3
Date: Sat, 04 Jun 2016 06:28:04 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=118401
--- Comment #21 from Navin ---
Can youou have ahci modules present in your initramfs ?
Mine returns like
1) lsinitramfs /boot/initrd.img-4.7.0-rc1+ | grep -i ahci
lib/modules/4.7.0-rc1+/kernel/drivers/ata/ahci_platform.ko
lib/modules/4.7.0-rc1+/kernel/drivers/ata/ahci.ko
lib/modules/4.7.0-rc1+/kernel/drivers/ata/libahci.ko
lib/modules/4.7.0-rc1+/kernel/drivers/ata/libahci_platform.ko
lib/modules/4.7.0-rc1+/kernel/drivers/ata/acard-ahci.ko
2) If the above returns that it is present and loaded confirmed by grep -i ahci
/proc/modules from your initramfs
grep -i ahci /proc/modules
ahci 36864 2 - Live 0xffffffffc0044000
libahci 32768 1 ahci, Live 0xffffffffc0015000
If (1) and (2) work as expected like described ie they are loaded and present.
Please post the output of (1) and (2) what it returns in your case.
3)
Then maybe something related to irq like described in
https://bugzilla.kernel.org/show_bug.cgi?id=111211
where comment 7 says "It works with 'pci=routeirq' parameter" in kernel command
line.
I asked for this because your 4.2 dmesg showed something like
[ 0.716610] ahci 0000:00:1f.2: version 3.0
[ 0.716620] ahci 0000:00:1f.2: can't find IRQ for PCI INT B; probably buggy
MP table
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