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Merge pull request #233 from taradiddles/inteldoc
Reformat intel fgx troubleshooting doc and add section about tearing
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@ -1,24 +1,90 @@
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# Intel Integrated Graphics Troubleshooting #
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# Intel Integrated Graphics Troubleshooting
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## Software Rendering or Video Lags
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If you are experiencing this issue, you will see extremely slow graphics updates.
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You will be able to watch the screen and elements paint slowly from top to bottom.
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You can confirm this is the issue by looking for a line similar to the following in your `/var/log/Xorg.0.log` file:
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If you are experiencing this issue, you will see extremely slow graphics
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updates. You will be able to watch the screen and elements paint slowly from
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top to bottom. You can confirm this is the issue by looking for a line similar
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to the following in your `/var/log/Xorg.0.log` file:
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[ 131.769] (EE) AIGLX: reverting to software rendering
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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):
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* GRUB2: `/etc/default/grub`, `GRUB_CMDLINE_LINUX` line and
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Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`)
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Newer versions of the Linux kernel have renamed the `i915.alpha_support=1`
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option (which was originally called `i915.preliminary_hw_support=1`) to
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`i915.force_probe=*`, so if you needed this kernel option in the past you will
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have to rename it or add it to your configuration files (follow either GRUB2 or
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EFI, not both):
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* GRUB2: `/etc/default/grub`, `GRUB_CMDLINE_LINUX` line and
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Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`)
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* EFI: `/boot/efi/EFI/qubes/xen.cfg`, `kernel=` line(s)
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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".
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If you are unsure as to which parameter works with your kernel, check whether
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your kernel log from your latest boot has a message containing "i915: unknown
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parameter".
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## IOMMU-related issues ##
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## Fix tearing (glitches/artifacts/corruption/...)
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Dom0 Kernels currently included in Qubes have issues related to VT-d (IOMMU) and some versions of the integrated Intel Graphics Chip.
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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.
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By default Qubes OS uses `fbdev`, the framebuffer/modesetting driver. Without
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compositing VM windows exhibit graphical artefacts (dom0 is unaffected).
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Workarounds:
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* enable compositing; it is enabled by default in XFCE (if it was disabled for
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some reason, re-enabling it is done in "Window Manager Tweaks"; restarting
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`xfwm` isn't necessary). `i3wm`, `AwesomeWM` or `DWM` window managers don't
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provide compositing so their users would have to install a standalone
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compositing manager (the old
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[faq](https://faq.i3wm.org/question/3279/do-i-need-a-composite-manager-compton.1.html)
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mentions using `compton` but
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[`picom`](https://wiki.archlinux.org/title/Picom)
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is a more recent fork. Both are packaged in Fedora 32 and can be installed
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easily with `qubes-dom0-update`).
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* or switch to the `intel` driver. **Note: for some users the `intel` driver
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is unstable, triggering crashes/reboots !** - either reproducible (eg.
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moving a floating window to another monitor when using `i3wm`) to random and
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infrequent (eg. 1-3x a day with XFCE). In that case using the "UXA"
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acceleration method instead of the default "SNA" method seems to
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[fix](https://forum.qubes-os.org/t/qubesos-freeze-crash-and-reboots/12851/177)
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some crashes but [may
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introduce](https://forum.qubes-os.org/t/qubesos-freeze-crash-and-reboots/12851/178)
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other crashes.
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Create `/etc/X11/xorg.conf.d/20-intel.conf` with the following content:
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```
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Section "Device"
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Identifier "Intel Graphics"
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Driver "Intel"
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# UXA is more stable than the default SNA for some users
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Option "AccelMethod" "UXA"
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EndSection
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```
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A logout/login is then required.
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## Finding out which of `intel` or `fbdev` driver is in use:
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* `grep -E 'LoadModule.*(fbdev|intel)"' /var/log/Xorg.0.log`; eg. for `intel`:
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```
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(II) LoadModule: "intel"
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```
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* or, `sudo lsof +D /usr/lib64/xorg/modules/drivers/` ; eg. for `fbdev`:
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```
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Xorg [...] /usr/lib64/xorg/modules/drivers/modesetting_drv.so
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```
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## IOMMU-related issues
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Dom0 Kernels currently included in Qubes have issues related to VT-d (IOMMU) and
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some versions of the integrated Intel Graphics Chip. Depending on the specific
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hardware / software combination the issues are quite wide ranging, from
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apparently harmless log errors, to VM window refresh issues, to complete screen
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corruption and crashes rendering the machine unusable with Qubes.
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Such issues have been reported on at least the following machines:
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@ -29,32 +95,34 @@ Such issues have been reported on at least the following machines:
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* Thinkpad T450s
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Log errors only on :
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* Librem 13v1
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* Librem 13v1
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* Librem 15v2
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The installer for Qubes 4.0 final has been updated to disable IOMMU for the integrated intel graphics by default.
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However, users of 3.2 may experience issues on install or on kernel upgrades to versions higher than 3.18.x.
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The installer for Qubes 4.0 final has been updated to disable IOMMU for the
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integrated intel graphics by default. However, users of 3.2 may experience
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issues on install or on kernel upgrades to versions higher than 3.18.x.
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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.
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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>.
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Disabling IOMMU for the integrated graphics chip is not a security issue, as the
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device currently lives in dom0 and is not passed to a VM. This behaviour is
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planned to be changed as of Qubes 4.1, when passthrough capabilities will be
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[required for the GUI
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domain](https://github.com/QubesOS/qubes-issues/issues/2841).
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## Workaround for existing systems with VT-d enabled (grub / legacy mode) ##
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### Workaround for existing systems with VT-d enabled (grub / legacy mode)
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Edit the startup parameters for Xen:
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1. Open a terminal in dom0
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2. Edit `/etc/default/grub` (e.g. `sudo nano /etc/default/grub`)
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3. Add to the line `GRUB_CMDLINE_XEN_DEFAULT` the setting `iommu=no-igfx`, save and quit
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3. Add to the line `GRUB_CMDLINE_XEN_DEFAULT` the setting `iommu=no-igfx`, save
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and quit
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4. Commit the change with`sudo grub2-mkconfig --output /boot/grub2/grub.cfg`
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## Workaround for existing systems with VT-d enabled (UEFI) ##
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### Workaround for existing systems with VT-d enabled (UEFI)
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Edit the startup parameters for Xen:
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1. Open a terminal in dom0
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2. Edit `/boot/efi/EFI/qubes/xen.cfg` (e.g. `sudo nano /boot/efi/EFI/qubes/xen.cfg`)
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2. Edit `/boot/efi/EFI/qubes/xen.cfg` (e.g. `sudo nano
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/boot/efi/EFI/qubes/xen.cfg`)
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3. Add to the line `options` the setting `iommu=no-igfx`, save and quit
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<b name="f1">1</b> <https://github.com/QubesOS/qubes-issues/issues/2841> [↩](#a1-1)
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