Hi again, Navin found a workaround: acpi=noirq (and pci=noacpi) lets me boot with the newer kernels. Attached are dmesg's from 4.7rc2 and 4.7rc5 from http://kernel.ubuntu.com/~kernel-ppa/mainline/ (rc5 complained about missing noveau firmware; I haven't tried the newest linux-firmware package yet, but haven't yet seen anything *not* working in rc5 that was working in rc2). Other changes when using acpi=noirq that may or may not be relevant: The computer will now poweroff when I do a shutdown, and restarts correctly (it used to just "hang" at the end of the shutdown sequence), and a bluetooth device shows up that I didn't know I had. However, although I seem to be able to suspend, I can't resume (no response when hitting power button). All in all an improvement though … best regards, Kevin Brubeck Unhammer
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"Navin P.S" <navinp1912@xxxxxxxxx> čálii: > On Mon, Jun 6, 2016 at 1:01 PM, Kevin Brubeck Unhammer > <unhammer@xxxxxxxx> wrote: >> Hi, >> >> I have a Lenovo A740 (running Xubuntu 16.04) which, with kernel >> versions >= 4.3.0, tested up until 4.7.0, gives this on trying to boot: >> >> Begin: Waiting for root file system ... Begin: Running >> /scripts/local-block ... done. >> Begin: Running /scripts/local-block ... done. >> Begin: Running /scripts/local-block ... done. >> […] >> done. >> Gave up waiting for root device. >> >> and drops me into an (initramfs) shell, where my keyboard is >> unresponsive. The last kernel I tried which booted fine was 4.2.8. >> >> I reported this at https://bugzilla.kernel.org/show_bug.cgi?id=118401 >> and, after some investigation, was asked to contact ahci.c - AHCI SATA >> support. The attachments in that report show some output from initramfs >> (using a script in /etc/initramfs-tools/scripts/init-premount due to the >> keyboard not working). >> >> What should I do to keep debugging this issue? >> > > I have been working with Kevin on the bug 118401 . > > I'll post the summary. > The kernel 4.2 works and he is able to boot the system. > Kernel 4.4 and 4.6, 4.7 drops into initramfs shell for the same uuid. > Upon further investigation cat /proc/devices showed no block devices > other than zram and loop.The command /sbin/blkid on 4.6 and later > didn't give any output whereas on 4.2 it does. > > Kernel 4.2 shows the ahci used count is 3 > ahci 36864 3 - Live 0x0000000000000000 > libahci 32768 1 ahci, Live 0x0000000000000000 > > Where kernel 4.7 doesn't load the ahci module upon boot and upon > modprobe ahci from the initramfs shell it shows the ahci count as 0. > So it is not detecting the drive. Not sure why ? > > Some more things to note from 4.2 dmesg it prints not sure if it is relevant. > > [ 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 > > [ 0.735267] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 4 ports 6 > Gbps 0x1 impl SATA mode > > [ 0.746033] ata1: SATA max UDMA/133 abar m2048@0xb5618000 port > 0xb5618100 irq 44 > > [ 1.068001] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) > > [ 1.134029] ata1.00: ATA-8: ST1000LM014-1EJ164-SSHD-8GB, LIV6, max UDMA/133 > [ 1.134030] ata1.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA > [ 1.178470] ata1.00: configured for UDMA/133 > [ 1.178620] scsi 0:0:0:0: Direct-Access ATA > ST1000LM014-1EJ1 LIV6 PQ: 0 ANSI: 5 > [ 1.178853] sd 0:0:0:0: [sda] 1953525168 512-byte logical blocks: > (1.00 TB/931 GiB) > [ 1.178855] sd 0:0:0:0: [sda] 4096-byte physical blocks > [ 1.178879] sd 0:0:0:0: [sda] Write Protect is off > [ 1.178881] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 > > > where as 4.6 and later doesn't print these messages.dmesg | grep > ata[0-4] gives no output. > > lspci on 4.2 gives this > > 00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 > [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0]) > Subsystem: Lenovo 8 Series SATA Controller 1 [AHCI mode] > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- > Stepping- SERR- FastB2B- DisINTx+ > Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > <TAbort- <MAbort- >SERR- <PERR- INTx- > Latency: 0 > Interrupt: pin B routed to IRQ 44 > Region 0: I/O ports at 6088 [size=8] > Region 1: I/O ports at 6094 [size=4] > Region 2: I/O ports at 6080 [size=8] > Region 3: I/O ports at 6090 [size=4] > Region 4: I/O ports at 6060 [size=32] > Region 5: Memory at b5618000 (32-bit, non-prefetchable) [size=2K] > Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit- > Address: fee0400c Data: 4181 > Capabilities: [70] Power Management version 3 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-) > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [a8] SATA HBA v1.0 BAR4 Offset=00000004 > Kernel driver in use: ahci > Kernel modules: ahci > > > Regards, > Navin
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