Display problems with VT-D enabled [ T410 (2537P81) ]

[Boris Kourtoukov]

This issue was described but not followed up on from this topic: https://groups.google.com/d/topic/qubes-users/WsHQ_GqXdT4/discussion

If VT-d is enabled in the BIOS the display:

   Works fine when viewing the boot options for Qubes (start Qubes/start in Advanced mode, etc.)
   Shows a bunch of jumbled graphics artifacts on the HD encryption view.
   Completely fails after that.

If VT-d is disabled:
  
   All visuals behave correctly.

Please note that the HCL currently states that VT-d works correctly on both of the T410's listed there. (Which it may be, just this display issue)

Hardware details:

Lenovo Thinkpad T410 (2537P81)
BIOS: 6IET85WW (1.45)

Qubes: 3.0
XEN: 4.4.2
Kernel: 3.19.8-100

VGA: Intel ... (rev 02) (prog-if 00 [VGA controller])

HVM: Active
I/O MMU: Not Active (while disabled)
TPM: Device Present

Any help would be greatly appreciated!

[Boris Kourtoukov]

Does this just mean that the VT-d implementation is broken on this hardware and I should grab something else?

Thanks

[Marek Marczykowski-Górecki]

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On Sun, Nov 08, 2015 at 12:57:14PM -0800, Boris Kourtoukov wrote:
> Does this just mean that the VT-d implementation is broken on this hardware
> and I should grab something else?

This is one possibility (slightly more likely). The other one is buggy driver.

- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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[Boris Kourtoukov]

Bumping it for search results on T410, the following Qubes wiki entry fixes this issue for me: https://www.qubes-os.org/doc/thinkpad_x201/

Thanks to this thread: https://groups.google.com/d/msg/qubes-users/7Q7C81AI3Aw/A7zzU2ajAwAJ

A year later I have VT-d! :)

[raah...@gmail.com]

hahah sweet!