I've tested 5.19.0-42.43~22.04.1 from jammy-proposed which had a few
vmwgfx changes listed in its changelog, but it didn't work; I didn't see
the same revert as in 5.19.0-44.45 or a reference to that bug, so I'll
open a jammy task to land this fix there too.
** Also affects: linux-hwe-5.19 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-hwe-5.19 (Ubuntu Jammy)
Importance: Undecided
Status: New
** No longer affects: linux-hwe-5.19 (Ubuntu Kinetic)
** No longer affects: linux (Ubuntu Jammy)
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/2007001
Title:
vmwgfx fails to reserve graphics buffer on aarch64 leading to blank
display
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Kinetic:
Fix Committed
Bug description:
BugLink: https://bugs.launchpad.net/bugs/2007001
[Impact]
Numerous VMWare users have reported that vmwgfx cannot reserve the
memory region for the graphics framebuffer, leading their VMs to have
blank screens.
They see the following in dmesg:
[ 11.135360] vmwgfx 0000:00:0f.0: BAR 2: can't reserve [mem
0x70000000-0x77ffffff 64bit pref]
[ 11.135366] vmwgfx: probe of 0000:00:0f.0 failed with error -16
And a cat /proc/iomem shows this:
50000000-7fffffff : PCI Bus 0000:00
70000000-77ffffff : 0000:00:0f.0
70000000-702fffff : BOOTFB
The kernel has failed to release this memory region for vmwgfx to
occupy.
Most affected users are on aarch64, with the host being Apple silicon
systems.
[Fix]
The regression was introduced by the below commit in
5.19.0-30-generic:
commit 5e01376124309b4dbd30d413f43c0d9c2f60edea
Author: Thomas Zimmermann <tzimmerm...@suse.de>
Date: Mon Jul 18 09:23:18 2022 +0200
Subject: video/aperture: Disable and unregister sysfb devices via aperture
helpers
Link:
https://github.com/torvalds/linux/commit/5e01376124309b4dbd30d413f43c0d9c2f60edea
This commit was part of a larger refactoring of the video subsystem,
and requires the entire series to function correctly. You can review
the whole series below:
https://patchwork.freedesktop.org/series/106040/
The patch series also requires quite a few additional fixups to fix
bugs introduced by the series, making the size about 15 commits in
total. The contents of the series don't really fix any bugs, and their
purpose is to refactor the code for future changes to the fbdev
subsystem, and really aren't appropriate to be backported to a stable
kernel series.
"video/aperture: Disable and unregister sysfb devices via aperture
helpers" seems to have been selected for -stable by mistake by its
fixes: tag, and was pulled into upstream stable by a robot with little
human review.
The best course of action is to revert. No action needed for Lunar, as
the entire series is present in that release.
[Testcase]
This bug affects users running Ubuntu in VMWare VMs, notably on
aarch64 devices, like modern Apple computers.
Start a Kinetic or Jammy-HWE Server or Desktop VM in VMWare Fusion on
Apple silicon, and see if the display comes up or not.
Affected users will see a blank screen.
There is a test kernel available in the following ppa:
https://launchpad.net/~mruffell/+archive/ubuntu/lp2007001-test
If you install the test kernel and reboot, you will be able to see the
screen on your VM like normal.
[Where problems could occur]
This commit changes when the sysfb is disabled and memory region for
the graphics framebuffer is released to the proper device driver.
If a regression were to occur, then graphics drivers may fail to
reserve the framebuffer memory, and fail to start, leaving users with
a blank screen.
There are no workarounds, other than booting a previous kernel.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2007001/+subscriptions
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