Re: SATA link power management issues

[Suman Tripathi]

Can you dump the ata_id parameters(LPM section) from the drive and we
can check the related LPM parameters of the drive ?

On Mon, Jan 12, 2015 at 10:42 PM, Suman Tripathi <stripathi@xxxxxxx> wrote:
> Hi,
>
> I'm having some problems with the link_power_management_policy on my
> Dell XPS13 9333.
> Changing policy from min_power or medium_power to max_performance
> causes the following errors:
>
> [ 3955.667086] ahci 0000:00:1f.2: port does not support device sleep
> [ 3958.257106] ata3.00: exception Emask 0x10 SAct 0x40 SErr 0x50000 action
> 0xe frozen
> [ 3958.257110] ata3.00: irq_stat 0x00400000, PHY RDY changed
> [ 3958.257113] ata3: SError: { PHYRdyChg CommWake }
> [ 3958.257116] ata3.00: failed command: READ FPDMA QUEUED
> [ 3958.257120] ata3.00: cmd 60/00:30:c8:60:10/01:00:1d:00:00/40 tag 6 ncq
> 131072 in
>          res 40/00:34:c8:60:10/00:00:1d:00:00/40 Emask 0x10 (ATA bus error)
> [ 3958.257122] ata3.00: status: { DRDY }
> [ 3958.257126] ata3: hard resetting link
> [ 3958.981727] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 3958.984994] ata3.00: configured for UDMA/133
> [ 3958.997686] ahci 0000:00:1f.2: port does not support device sleep
> [ 3958.997698] ata3: EH complete
>
> Sometimes I get "failed command: WRITE FPDMA QUEUED" multiple times.
>
> As far as I know, this had always happened and it was confirmed
> by another user. I've also come across some logs of the same system
> and saw the same errors here and there, so it shouldn't be a problem
> of my laptop in particular.
>
> What I find interesting is that transitions from min_power to
> medium_power and vice versa do not cause these errors. There are only
> problem switching from min_power and medium_power to max_performance.
> Doing the opposite, i.e. from max_performance to min_power or
> medium_power, seems to work fine.
>
> As a consequence of these continuous errors, the speed is reduced
> from 6.0 Gbps to 1.5 Gbps.
>
> I'd prefer not to disable LPM as it saves a considerable amount of
> power when I'm using the battery. For this reason I'm currently using
> medium_power and min_power only to prevent errors.
>
> Is it normal that these errors appears only when I switch to
> max_performance? Was something similar observed on other systems?
> Can you dump the ata_id parameters(LPM section) from the drive and we can
> check the related LPM parameters of the drive ?
>
> Thanks,
> Gabriele
> --
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>
> On Fri, Jan 9, 2015 at 1:07 AM, Gabriele Mazzotta <gabriele.mzt@xxxxxxxxx>
> wrote:
>>
>> Hi,
>>
>> I'm having some problems with the link_power_management_policy on my
>> Dell XPS13 9333.
>> Changing policy from min_power or medium_power to max_performance
>> causes the following errors:
>>
>> [ 3955.667086] ahci 0000:00:1f.2: port does not support device sleep
>> [ 3958.257106] ata3.00: exception Emask 0x10 SAct 0x40 SErr 0x50000 action
>> 0xe frozen
>> [ 3958.257110] ata3.00: irq_stat 0x00400000, PHY RDY changed
>> [ 3958.257113] ata3: SError: { PHYRdyChg CommWake }
>> [ 3958.257116] ata3.00: failed command: READ FPDMA QUEUED
>> [ 3958.257120] ata3.00: cmd 60/00:30:c8:60:10/01:00:1d:00:00/40 tag 6 ncq
>> 131072 in
>>          res 40/00:34:c8:60:10/00:00:1d:00:00/40 Emask 0x10 (ATA bus
>> error)
>> [ 3958.257122] ata3.00: status: { DRDY }
>> [ 3958.257126] ata3: hard resetting link
>> [ 3958.981727] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
>> [ 3958.984994] ata3.00: configured for UDMA/133
>> [ 3958.997686] ahci 0000:00:1f.2: port does not support device sleep
>> [ 3958.997698] ata3: EH complete
>>
>> Sometimes I get "failed command: WRITE FPDMA QUEUED" multiple times.
>>
>> As far as I know, this had always happened and it was confirmed
>> by another user. I've also come across some logs of the same system
>> and saw the same errors here and there, so it shouldn't be a problem
>> of my laptop in particular.
>>
>> What I find interesting is that transitions from min_power to
>> medium_power and vice versa do not cause these errors. There are only
>> problem switching from min_power and medium_power to max_performance.
>> Doing the opposite, i.e. from max_performance to min_power or
>> medium_power, seems to work fine.
>>
>> As a consequence of these continuous errors, the speed is reduced
>> from 6.0 Gbps to 1.5 Gbps.
>>
>> I'd prefer not to disable LPM as it saves a considerable amount of
>> power when I'm using the battery. For this reason I'm currently using
>> medium_power and min_power only to prevent errors.
>>
>> Is it normal that these errors appears only when I switch to
>> max_performance? Was something similar observed on other systems?
>>
>> Thanks,
>> Gabriele
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
>
>
> --
> Thanks,
> with regards,
> Suman Tripathi



-- 
Thanks,
with regards,
Suman Tripathi
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