Messages in this thread | | | Date | Tue, 29 Oct 2013 21:12:15 +0100 | From | Jan Kara <> | Subject | Re: 3.12-rc5 and overwritten partition table |
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On Tue 29-10-13 12:37:01, John Twideldum wrote: > Hi... > > I have a shiny new Haswell notebook (Lenovo T440s), where with 3.11 processor power > management didn't work, so I got 3.12-rc5 installed. > Worked fine for a few days, then today it no longer boots and inspection yields... > > # dd if=/dev/sda count=1 |od -t c |tr -d " " > 512 bytes (512 B) copied, 0.00115806 s, 442 kB/s > 0000000 13.00000\nalsa:hw > 0000020 C0D0\t99.00000\nal > 0000040 sa:hwC0D3\t99.000 > 0000060 00\nbacklight:acp > 0000100 i_video0\t73.0000 > 0000120 0\nbacklight:acpi > 0000140 _video0-power\t10 > 0000160 0.00000\nbackligh > 0000200 t:intel_backligh > 0000220 t\t0.00000\nbackli > 0000240 ght:intel_backli > 0000260 ght-power\t0.0000 > 0000300 0\ncpu-consumptio > 0000320 n\t0.00000\ncpu-wa > 0000340 keups\t875.00000\n > 0000360 disk-operations\t > 0000400 0.00000\ndisk-ope > 0000420 rations-hard\t0.0 > 0000440 0000\neth0-link-1 > 0000460 00\t0.00000\neth0- > 0000500 link-1000\t0.0000 > 0000520 0\neth0-link-high > 0000540 \t0.00000\neth0-pa > 0000560 ckets\t0.00000\net > 0000600 h0-powerunsave\t0 > 0000620 .00000\neth0-up\t0 > 0000640 .00000\ngpu-opera > 0000660 tions\t134.00000\n > 0000700radio:hci0\t100.0 > 00007200000\nradio:phy0\t > 0000740100.00000\nradio: > 0000760tpacpi_bluetooth > 0001000 > > :-( > > In order to figure out the reason for this, can you kernel guys maybe > a) tell me what is that datastructure? > b) can power management be buggy to cause this - I played with powertop tuneables > approximately while this happened? > > ...and point me to a recovery tool/doc for finding the partitions again, > "testdisk" tool only found 1 of 3, the least important one at the beginning of > disk but not the rest :-( You can always look for fs-specific magic numbers in the superblock. What filesystems did you use?
Honza -- Jan Kara <jack@suse.cz> SUSE Labs, CR
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