CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT should be disabled

Bug #1473319 reported by Timo Aaltonen
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Fix Released
Medium
Timo Aaltonen

Bug Description

CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT is currently enabled, probably so that testing prerelease hardware is more convenient.

But it has it's downsides too, the most important being that a release might ship with a kernel that has limited driver support for the new hardware, causing issues like the installer booting to a blank screen or crashing halfway through. In these cases it's best to rely on the fallback gfx driver so that the system can be installed and also used with limited functionality, until a proper (and possibly a 3rd party) kernel can be installed.

This is also what upstream suggests for us to do. The setting can be overriden on kernel cmdline, so it allows testing said hw with i915.preliminary_hw_support=1.

CVE References

Timo Aaltonen (tjaalton)
Changed in linux (Ubuntu):
assignee: nobody → Timo Aaltonen (tjaalton)
status: New → Triaged
Andy Whitcroft (apw)
Changed in linux (Ubuntu):
importance: Undecided → Medium
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 4.1.0-1.1

---------------
linux (4.1.0-1.1) wily; urgency=low

  [ Andy Whitcroft ]

  * SAUCE: overlay: add backwards compatible overlayfs format support V3
    - LP: #1395877, #1410480
  * SAUCE: overlayfs: when copying up and reading directories ensure
    mounter had permissions V2
    - CVE-2015-1328
  * [Packaging] fix up Vcs-Git: to point to launchpad
  * [Config] correct linux-initramfs-tool virtual linkage
    - LP: #1474810

  [ Chris J Arges ]

  * [Config] Add dm-service-time to multipath-modules
    - LP: #1469240
  * [Config] Add MTD_POWERNV_FLASH and OPAL_PRD
    - LP: #1464560

  [ Jay Vosburgh ]

  * SAUCE: fan: Proof of concept implementation (v2)
    - LP: #1439706
  * SAUCE: fan: tunnel multiple mapping mode (v3)
    - LP: #1470091

  [ Leann Ogasawara ]

  * Revert "SAUCE: ext4: disable ext4_punch_hole for indirect filesystems"
  * Revert "SAUCE: intel_pstate: inform user that thermald is worth
    considering"
  * Revert "SAUCE: Work around broken ACPI backlight on Dell Inspiron 5537"
  * Revert "SAUCE: dm-crypt: never use write same"
  * Release Tracking Bug
    - LP: #1476333

  [ Tim Gardner ]

  * Rebase to v4.1
    - LP: #1443371
  * [Config] Enable Apparmor
  * [Config] CONFIG_OVERLAY_FS_V1=y
  * [Config] DEFAULT_IOSCHED="deadline" for ppc64el
    - LP: #1469829
  * [Config] CONFIG_VM86=n
    - LP: #1473447
  * [Config] ACORN_PARTITION=n
    - LP: #1453117

  [ Timo Aaltonen ]

  * [Config] Disable CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT
    - LP: #1473319

  [ Upstream Kernel Changes ]

  * efi: efivar_create_sysfs_entry() should return negative error codes
  * efi: Add esrt support
  * x86, doc: Remove cmdline_size from list of fields to be filled in for
    EFI handover
  * efi/esrt: Fix some compiler warnings
  * efi: dmi: List SMBIOS3 table before SMBIOS table
  * efi: Add 'systab' information to Documentation/ABI
  * ALSA: hda - restore the MIC FIXUP for some Dell machines
    - LP: #1473560
  * mtd: powernv: Add powernv flash MTD abstraction driver
    - LP: #1464560
  * powerpc/powernv: Expose OPAL APIs required by PRD interface
    - LP: #1464560
  * powerpc/powernv: Add opal-prd channel
    - LP: #1464560
  * powerpc/powernv: fix construction of opal PRD messages
    - LP: #1464560
  * powerpc/include: Add opal-prd to installed uapi headers
    - LP: #1464560
  * powerpc/powernv: Fix vma page prot flags in opal-prd driver
    - LP: #1464560

 -- Leann Ogasawara <email address hidden> Mon, 20 Jul 2015 10:16:06 -0700

Changed in linux (Ubuntu):
status: Triaged → Fix Released
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