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5 Posts

03-02-2019

AU

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-02, 10:55 AM

If you are still using

iommu=soft

you should replace it with the two IVRS overrides for better performance. Take care that you are using the latest 4.20.x kernel.

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8 Posts

12-18-2018

AU

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-02, 12:23 PM

It was mentioned by people that have done it (the ten minutes). Is just a data table where they have to enter the correct number.

 

When developing the next version of the BIOS, correcting that table won't add more than ten minutes.

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12 Posts

03-28-2016

US

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-02, 12:31 PM

I'm using kernel version 4.18 with just the ivrs overides and everything works but I do get an occaional random freeze. I think it may be related to the video drivers though.

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5 Posts

03-02-2019

AU

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-03, 12:00 PM

I attempted to flash a modified BIOS image: no luck. It turns out that the digital signature is checked, so it can't be altered by the end user.

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1 Posts

03-04-2019

GB

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-04, 10:25 AM

Just posting so as to add my voice among the other voices requesting for this to be fixed, as the more requesting this the more likely Lenovo fixes this hopefully.

 

I think part of the reason they haven't fixed this is probably to do with backwards compatibility and testing, as if the fix for this breaks people's machines it could make it difficult to roll out.

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68 Posts

10-20-2018

CA

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-04, 16:28 PM

I gave up on this.

 

Lenovo actually did us a favour by selecting devices that have readily-available drivers so I'll take that victory and move on.

 

I'm inclined to blame AMD for this.

 

Just think about how everyone made a big deal about Intel being more gravely affected by spectre and meltdown but they responded quickly and even distributed mitigations for CPUs dating back to Nehalem architecture!

 

Lenovo is not the only one affected, since there have been complaints from owners of other Ryzen laptops too.

 

Since AMD is now including mobile Ryzen in their driver packages, maybe they will address this issue for everybody.

 

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59 Posts

05-11-2017

US

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-04, 19:47 PM

I was just about to buy this machine and thought to check for reviews. Glad I did. Will the problem discussed in this thread affect me as a Windows 10 user?

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20 Posts

08-31-2018

US

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-04, 20:08 PM

No, Windows is fine.

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68 Posts

10-20-2018

CA

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-04, 20:41 PM

Windows 10 "boots" fine. However, the "AMD IOMMU Device" is absent. I don't know how commonly used it is in Windows, but its absence doesn't affect operation.

 

People who've tried Windows 7 say it doesn't boot either. Granted, Microsoft doesn't support Windows 7 on new systems.

 

Even on Linux, our laptops work well enough once they boot.

 

 

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5 Posts

03-02-2019

AU

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Re: ThinkPad E485/E585 - Firmware bug ACPI IVRS table

2019-03-06, 5:14 AM

The ACPI DSDT table is commonly overridden by loading an archive containing a modified version of it at boot. I'll look into whether this can be done for the IVRS table.

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