Newer versions of the Linux kernel have renamed the `i915.alpha_support=1` option (which was originally called `i915.preliminary_hw_support=1`) to `i915.force_probe=*`, so if you needed this kernel option in the past you will have to rename it or add it to your configuration files (follow either GRUB2 or EFI, not both):
If you are unsure as to which parameter works with your kernel, check whether your kernel log from your latest boot has a message containing "i915: unknown parameter".
Dom0 Kernels currently included in Qubes have issues related to VT-d (IOMMU) and some versions of the integrated Intel Graphics Chip.
Depending on the specific hardware / software combination the issues are quite wide ranging, from apparently harmless log errors, to VM window refresh issues, to complete screen corruption and crashes rendering the machine unusable with Qubes.
Such issues have been reported on at least the following machines:
* HP Elitebook 2540p
* Lenovo x201
* Lenovo x220
* Thinkpad T410
* Thinkpad T450s
Log errors only on :
* Librem 13v1
* Librem 15v2
The installer for Qubes 4.0 final has been updated to disable IOMMU for the integrated intel graphics by default.
However, users of 3.2 may experience issues on install or on kernel upgrades to versions higher than 3.18.x.
Disabling IOMMU for the integrated graphics chip is not a security issue, as the device currently lives in dom0 and is not passed to a VM.
This behaviour is planned to be changed as of Qubes 4.1, when passthrough capabilities will be required for the GUI domain <supid="a1-1">[1](#f1)</sup>.
## Workaround for existing systems with VT-d enabled (grub / legacy mode) ##