| 2019-04-25 20:26:44 |
Dexuan Cui |
bug |
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added bug |
| 2019-04-25 20:47:41 |
Joseph Salisbury |
bug |
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|
added subscriber Joseph Salisbury |
| 2019-04-26 19:30:19 |
Mathieu Trudel-Lapierre |
nominated for series |
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Ubuntu Trusty |
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| 2019-04-26 19:30:19 |
Mathieu Trudel-Lapierre |
bug task added |
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grub2 (Ubuntu Trusty) |
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| 2019-04-26 19:30:19 |
Mathieu Trudel-Lapierre |
nominated for series |
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Ubuntu Xenial |
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| 2019-04-26 19:30:19 |
Mathieu Trudel-Lapierre |
bug task added |
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grub2 (Ubuntu Xenial) |
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| 2019-04-26 19:30:27 |
Mathieu Trudel-Lapierre |
grub2 (Ubuntu): status |
New |
Fix Released |
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| 2019-04-26 19:30:33 |
Mathieu Trudel-Lapierre |
grub2 (Ubuntu Xenial): status |
New |
In Progress |
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| 2019-04-26 19:30:36 |
Mathieu Trudel-Lapierre |
grub2 (Ubuntu Xenial): assignee |
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Mathieu Trudel-Lapierre (cyphermox) |
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| 2019-04-26 19:30:39 |
Mathieu Trudel-Lapierre |
grub2 (Ubuntu Xenial): importance |
Undecided |
Medium |
|
| 2019-04-27 12:36:28 |
Francis Ginther |
tags |
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id-5cc33192fdf0ba69633c3a45 |
|
| 2019-04-29 18:12:45 |
Mathieu Trudel-Lapierre |
description |
In a Ubuntu 16.04.6 VM, which runs as a Gen2 VM on Hyper-V, I add GRUB_GFXPAYLOAD_LINUX="text" into /etc/default/grub and run update-grub; next, grub2 prints the below error:
error: invalid video mode specification `text'.
Booting in blind mode
This means grub2 passes a zero value for the "lfb_base" to Linux kernel, which then fails to reserve the framebuffer MMIO range in drivers/hv/vmbus_drv.c: vmbus_reserve_fb(); as a result, when we pass through a PCIe device to the VM, the PCIe device may get a PCI MMIO BAR in the FB MMIO range, causing a conflict, and the PCIe device can not work in the VM.
The issue can not reproduce with Ubuntu 18.04. It turns out the grub2 in Ubuntu 18.04 has the below fix:
video: skip 'text' gfxpayload if not supported, to fallback to default (https://git.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/commit/?id=38d9e2f862a96a039ae8ca8b87b8615d154ceda4).
I'm asking the patch author (Mathieu Trudel-Lapierre) to submit the patch to the upstream grub and this is the upstream bug link: https://savannah.gnu.org/bugs/?56217 .
Here this launchpad bug is for Ubuntu 16.04 and 14.04. |
[Impact]
UEFI users booting VMs on Hyper-V
[Test case]
1) Install Ubuntu 16.04 in a Gen2 VM on Hyper-V (Windows)
2) After install; edit /etc/default/grub to add:
GRUB_GFXPAYLOAD_LINUX="text"
3) Run 'sudo update-grub'
4) Reboot
Verify whether the system writes an error/warning on console during boot (this shows up and disappears quickly, one must watch the console attentively):
error: invalid video mode specification `text'.
Booting in blind mode
[Regression potential]
There is minimal risk of regression; this is a patch that has been succesfully used in other releases to address the same issue (see bug 1711452). It only affects graphical payload selection in grub to avoid a value that is clearly invalid, thus skipping the error value and falling back to the default text-mode. Care should be taking while testing to identify any possible issues with displaying the grub menu or outputting information from the kernel at console as the system boots (if applicable).
---
In a Ubuntu 16.04.6 VM, which runs as a Gen2 VM on Hyper-V, I add GRUB_GFXPAYLOAD_LINUX="text" into /etc/default/grub and run update-grub; next, grub2 prints the below error:
error: invalid video mode specification `text'.
Booting in blind mode
This means grub2 passes a zero value for the "lfb_base" to Linux kernel, which then fails to reserve the framebuffer MMIO range in drivers/hv/vmbus_drv.c: vmbus_reserve_fb(); as a result, when we pass through a PCIe device to the VM, the PCIe device may get a PCI MMIO BAR in the FB MMIO range, causing a conflict, and the PCIe device can not work in the VM.
The issue can not reproduce with Ubuntu 18.04. It turns out the grub2 in Ubuntu 18.04 has the below fix:
video: skip 'text' gfxpayload if not supported, to fallback to default (https://git.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/commit/?id=38d9e2f862a96a039ae8ca8b87b8615d154ceda4).
I'm asking the patch author (Mathieu Trudel-Lapierre) to submit the patch to the upstream grub and this is the upstream bug link: https://savannah.gnu.org/bugs/?56217 .
Here this launchpad bug is for Ubuntu 16.04 and 14.04. |
|
| 2019-04-29 18:48:10 |
Brian Murray |
grub2 (Ubuntu Xenial): status |
In Progress |
Fix Committed |
|
| 2019-04-29 18:48:11 |
Brian Murray |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2019-04-29 18:48:12 |
Brian Murray |
bug |
|
|
added subscriber SRU Verification |
| 2019-04-29 18:48:16 |
Brian Murray |
tags |
id-5cc33192fdf0ba69633c3a45 |
id-5cc33192fdf0ba69633c3a45 verification-needed verification-needed-xenial |
|
| 2019-04-30 17:52:18 |
Brian Murray |
bug task added |
|
grub2-signed (Ubuntu) |
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| 2019-04-30 20:15:11 |
Brian Murray |
grub2-signed (Ubuntu Xenial): status |
New |
Fix Committed |
|
| 2019-04-30 20:15:15 |
Brian Murray |
grub2-signed (Ubuntu): status |
New |
Fix Released |
|
| 2019-05-02 14:29:20 |
Mathieu Trudel-Lapierre |
tags |
id-5cc33192fdf0ba69633c3a45 verification-needed verification-needed-xenial |
id-5cc33192fdf0ba69633c3a45 verification-done-xenial |
|
| 2019-05-06 08:49:39 |
Launchpad Janitor |
grub2 (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
| 2019-05-06 08:49:47 |
Łukasz Zemczak |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2019-05-06 08:49:50 |
Launchpad Janitor |
grub2-signed (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
