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add i915.alpha_support, headings

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per https://mail-archive.com/qubes-users@googlegroups.com/msg19023.html
also fix line breaks and some punctuation
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troubleshooting/intel-igfx-troubleshooting.md
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@ -5,9 +5,25 @@ permalink: /doc/intel-igfx-troubleshooting/
---
# Intel Integrated Graphics Troubleshooting #
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.
## Software Rendering or Laggy Video
If you are experiencing this issue, you will see extremely slow graphics updates.
You will be able to watch the screen and elements paint slowly from top to bottom.
You can confirm this is the issue by looking for a line similar to the following in your `/var/log/Xorg.0.log` file:
[ 131.769] (EE) AIGLX: reverting to software rendering
Newer versions of the Linux kernel have renamed the `i915.preliminary_hw_support=1` option to `i915.alpha_support=1`, 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):
* GRUB2: `/etc/default/grub`, `GRUB_CMDLINE_LINUX` line and
Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`)
* EFI: `/boot/efi/EFI/qubes/xen.cfg`, `kernel=` line(s)
## IOMMU ##
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:
@ -21,11 +37,11 @@ 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
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 of 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 <sup id="a1-1">[1](#f1)</sup>
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 <sup id="a1-1">[1](#f1)</sup>.
## Workaround for existing systems with VT-d enabled (grub / legacy mode) ##