** Changed in: linux (Ubuntu Hirsute)
       Status: Confirmed => Fix Committed

-- 
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/1929217

Title:
  Select correct boot VGA when BIOS doesn't do it properly

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Won't Fix
Status in linux-oem-5.10 source package in Focal:
  Confirmed
Status in linux source package in Hirsute:
  Fix Committed
Status in linux-oem-5.10 source package in Hirsute:
  Invalid

Bug description:
  [Impact]
  On HP EliteDesk 805 G7 desktop, when a add-in discrete GFX card is
  present but the display is connected to integrated GPU, BIOS cannot find
  the correct boot VGA. Hence, wrong OpenGL/Vulkan library is used, makes
  the desktop environment very laggy.

  [Fix]
  The current heuristic picks the fallback VGA device with lowest PCI
  device number. Based on the current heuristic, also check for ACPI video
  device which should be the integrated VGA device.

  [Test]
  Check if the integrated GPU is the boot VGA:
  $ cat /sys/bus/pci/devices/0000\:08\:00.0/boot_vga
  0

  After applying the patch:
  $ cat /sys/bus/pci/devices/0000\:08\:00.0/boot_vga
  1

  [Where problems could occur]
  When there are multiple GPUs that are ACPI video devices, and BIOS
  failed to find a VGA to POST, the new heuristic introduces new behavior.

  Since multiple ACPI video devices are on laptops, the EFI base should
  already be correct otherwise there's no POST. If that really happens the
  laptop is completely broken at first place.

To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1929217/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to